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Plant Pest Diagnostics Center

John Sorensen

Dr. John Sorensen

retired Senior Insect Biosystematist - Specialist

Plant Pest Diagnostics Branch, California Department of Food & Agriculture
3294 Meadowview Road, Sacramento, CA 95832-1448, U.S.A.
916-262-1150 office, 916-262-1190 fax, jsorense@cdfa.ca.gov

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Curriculum vitae

Education

  • Doctor of Philosophy (Entomology) - University of California, Berkeley. 1983
  • Master of Arts (Biology) - University of Northern Iowa, 1972.
  • Bachelor of Science (Biological and Physical Sciences in Agriculture (Entomology) - University of Minnesota, St. Paul. 1970

Professional Responsibilities

  • California state authority on the identification, biology and ecology of:
  • Homoptera: Aphidoidea (1990-2013), Phylloxeroidea (1982-2013), Aleyrodoidea; Coccoidea excluding Pseudococcidae (1982-2004), Pseudococcidae (1982-1997), Auchenorrhyncha (1982-2003)
  • Hymenoptera (1992-present)
  • Primary Diagnostician for California Red Imported Fire Ant (RIFA) Program (1997-p.)
  • Lead Scientist for PPDC component of Exclusion’s border station remote internet identification program
  • Research: morphological, molecular and quantitatively-based systematics of the assigned taxonomic groups, including development of effective diagnostics using nucleotide, morphometric and quantitative genetic-based methodologies. Field assessment and development of location and monitoring pests of these groups. 

Positions Held

  • 1999-2013, Senior Insect Biosystematist (Specialist): Plant Pest Diagnostics Center, C.D.F.A., Sacramento, CA
  • 1984-1999, Associate Insect Biosystematist: Plant Pest Diagnostics Center, C.D.F.A., Sacramento, CA
  • 1982-1984, Systematic Entomologist III: Analysis & Identification Unit, C.D.F.A., Sacramento, CA
  • 1981, Staff Teaching Associate: Dept. of Biological Sciences, Univ. of Calif., Berkeley, CA
  • 1981, Staff Teaching Associate: Dept. of Entomological Sciences, Univ. of Calif., Berkeley, CA
  • 1976-1981, Graduate Research Assistant: Dept. of Entomological Sciences, Univ. of Calif., Berkeley, CA
  • 1974, 1976, Graduate Teaching Assistant: Dept. of Entomological Sciences, Univ. of Calif., Berkeley, CA
  • 1974-1976, Graduate Student Assistant: Dept. of Entomological Sciences, Univ. of Calif., Berkeley, CA
  • 1974-1976, National Institute of Health Trainee: Dept. of Entomological Sciences, Univ. of Calif., Berkeley, CA
  • 1972-1974, Staff Research Associate: Div. of Biological Control, Univ. of Calif., Berkeley, CA
  • 1972, Graduate Teaching Assistant: Dept. of Biology, Univ. of Northern Iowa, Cedar Falls, IA
  • 1967-69, Laboratory Assistant: Dept of Entomology, Fisheries & Wildlife, University of Minnesota, St. Paul, MN

Additional Training

  • 1997, Covey Leadership Principles: Key Results Team, Division of Plant Industry, CDFA, Sacramento, CA
  • 1993, Hymenoptera Identification Course: Agriculture Canada, Ottawa, Ontario
  • 1984, Statistical Analysis System: Univ. of California, Davis, CA
  • 1984, Dialog Information Retrieval System: Lockheed Dialog, Palo Alto, CA
  • 1983, Information Data Base Management: Center for Advanced Professional Education, San Jose, CA
  • 1980, Karyotypic and morphometric techniques for aphids (V. Eastop, R. Blackman): British Museum (Nat. Hist.), London
  • 1980, Aphid Systematics (D. Hille Ris Lambers): Center for Aphid Research, Bennekom, Netherlands
  • 1978, Aphid Systematics (D. Hille Ris Lambers): Univ. of Calif., Berkeley, CA
  • 1973, Chemical and Biological Control of Insects: Univ. of San Francisco, San Francisco, CA

Publications

  1. Sorensen, J.T. 2003. Aphids, pp. 32-37. In: Resh, V. & R. Carde (eds.). Encyclopedia of Insects. Elsevier Science (USA), Academic Press, Burlington, Massachusetts. 1266 pp.
  2. Sorensen, J.T., F. Hrusa & T. Tyler, 2001. Origin of the Sudden Oak Death (SOD) pathogen and its potential impact: a working hypothesis. California Plant Pest and Disease Report 19 (3-6): 47 – 57.
  3. Chitambar, J., M. Stephenson, M. Abeyta, F. Andrews, T. Eichlin, E. Johnson, D. Meyer, D. Opganorth, M. Sawyer, J. Smith, J. Sorensen, T. Tyler, A. Wiems & B. Callison. 1999. Strategic Plan for the Plant Pest Diagnostic Center. Plant Pest Diagnostic Center, Division of Plant Health and Pest Prevention Services, California Dept. of Food & Agriculture, Sacramento, CA. 44 pp.
  4. Sorensen, J.T., R.J. Gill, B.C. Campbell, & J.D. Steffen-Campbell. 1997. New suborder names proposed for Hemiptera (s.l.). Tymbal, the Auchenorrhyncha Newsletter.
  5. Sorensen, J.T., B. Campbell, R. Gill & J. Steffen-Campbell. 1997. Evolutionary affiliations among hemipteran (s.l.) suborders; paraphyly of Homoptera and non-monophyly of Auchenorrhyncha. Proc. 9th International Auchenorrhyncha Congress. 17-21 February 1997. Sydney, Australia.
  6. Sorensen, J.T, & K.H. Sorensen. 1997. Aggregations of Thaumatomyia glabra (Meigen) (Diptera: Chloropidae) on Wisteria flowers (Fabaceae). Pan-Pacif. Entomol., 73: 47-48.
  7. Dowell, R.V., A. Gilbert, & J. Sorensen. 1997. Red imported fire ant found in California. California Plant Pest and Disease Report, 16 (3-4) June-Sept: 50-55.
  8. Minyard, P. et al. 1997. Findings: Key Results Area Review Committee for Pest Exclusion. Division of Plant Health and Pest Prevention Services, California Dept. of Food & Agriculture, Sacramento, CA.
  9. Sorensen, J.T. 1996. Recent California records for the sawfly Xiphydria mellipes Harris (Hymenoptera: Xiphydriidae). Pan-Pacif. Entomol., 72: 102-1 03
  10. Sorensen, J.T. & R.J. Gill. 1996. A range extension of Hormalodisca coagulata (Say) (Hemiptera: Clypeorrhyncha: Cicadellidae) to southern California. Pan-Pacif. Entomol., 72: 160-161.
  11. Campbell, B., J. Steffen-Campbell, J.T. Sorensen & R.J. Gill. 1995. Paraphyly of Homoptera and Auchenorrhyncha inferred from 18s rDNA nucleotide sequences. Systematic Entomology, 20: 175-195.
  12. Sorensen, J.T., B.C. Campbell, R.J. Gill & J.D. Steffen-Campbell. 1995. Non-monophyly of Auchenorrhyncha ("Homoptera"), based upon 18s rDNA phylogeny: eco-evolutionary and cladistic implications within pre-Heteropterodea Hemiptera (s.l.) and a proposal for new monophyletic suborders. Pan-Pacif. Entomol., 71: 31-60.
  13. Sorensen, J.T. 1994. A revision of the aphid genus Essigella (Homoptera: Aphididae: Lachninae): its ecological associations with, and evolution on, Pinaceae hosts. Pan-Pacif. Entomol., 70: 1-102.
  14. Bezark, L.G., J. Ghazanfari, R. Penrose, J. Sorensen, D. Woods & D. Zadig. 1994. Brown Citrus Aphid / Citrus Tristeza Virus Situation Assessment and Pest Response Guideline. California Dept. of Food & Agriculture, Division of Plant Industry, Sacramento, California. 70 pp.
  15. Sorensen, J.T. & R. Foottit. (eds.) 1992. Ordinations in the Study of Morphology, Systematics and Evolution of Insects, Applications and Quantitative Genetic Rationales. Elsevier Science Publishers, Amsterdam. 418 pp.
  16. Sorensen. J.T. 1992. The use of discriminant function analysis for estimation of phylogeny: partitioning, perspective and problems, pp. 65-93. In: Sorensen, J.T. & R. Foottit. (eds.) Ordinations in the Study of Morphology, Systematics and Evolution of Insects, Applications and Quantitative Genetic Rationales. Elsevier Science Publishers, Amsterdam. 418 pp.
  17. Sorensen, J.T. & R. Foottit. 1992. The evolutionary quantitative genetic rationales for the use of ordination analyses in systematics: phylogenetic implications, pp. 29-53. In: Sorensen, J.T. & R. Foottit. (eds.) Ordinations in the Study of Morphology, Systematics and Evolution of Insects, Applications and Quantitative Genetic Rationales. Elsevier Science Publishers, Amsterdam. 418 pp.
  18. Foottit, R. & J.T. Sorensen. 1992. Ordination methods: their contrast to clustering and cladistic techniques, pp. 1-10. In: Sorensen, J.T. & R. Foottit. (eds.) Ordinations in the Study Of Morphology, Systematics and Evolution of Insects, Applications and Quantitative Genetic Rationales. Elsevier Science Publishers, Amsterdam. 418 pp.
  19. Sorensen, J.T. 1992. Deciphering biological groupings in the Essigella knowltoni complex (Homoptera: Aphidinea: Lachnidae), and comparison to variation in Pinus contorta (Coniferae: Pinaceae). Entomol. Generalis, 17: 81 -99.
  20. Sorensen, J.T. 1991. (Book Review) P.W. Oman, W.J. Knight & M.W. Neilson. Leafhoppers (Cicadellidae): a bibliography, generic check-list and index to the world literature 1956-1 985. CAB International, Wallingford, Oxon, United Kingdom, 368 pp. (ISBN-0-85 1 98-690-0). Pan-Pacif. Entomol., 67: 75-76.
  21. Sorensen, J.T. 1991. (Book Review) Computer presentation of data in science: a do-it- yourself guide, based on the Apple Macintosh, for authors and illustrators in the sciences. By Doug Simmonds & Linda Reynolds. Kluwer Academic Publishers, Dordrecht & Boston (Massachusetts). $49.50. xiv + 178 pp.; ill. ISBN: 0-89838-41 5-X. 1989. Quar. Rev. Biol., 66: 113-114.
  22. Sorensen, J.T. 1991. Phylogenetic character responses for shape component variance during the multivariate evolution of eulachnine aphids: redescriptions of Pseudessigella Hille Ris Lambers (Homoptera: Aphididae: Lachninae). Pan-Pacif. Entomol., 67: 28-54.
  23. Sorensen, J.T. 1991. A historical summary of grape phylloxera in California. Analysis & ldentification Branch, Division of Plant Industry, California Dept. of Food & Agriculture, Special Publication for the California State Senate Committee on Agriculture and Water Resources: Grape Phylloxera Hearings, 9 December 1991. 11 pp.
  24. Sorensen, J.T. 1991. Potential evergreen landscape and screening plants useful in El Dorado Hills, California. El Dorado Hills Architectural Control Committee, El Dorado Hills Community Services District, El Dorado County, CA. 4 pp.
  25. Sorensen, J.T., R.J. Gill, R.V. Dowell & R.W. Garrison. 1990. The introduction of Siphoninus phillyreae (Haliday) (Homoptera: Aleyrodidae) into North America: niche competition, evolution of host plant acceptance, and a prediction of its potential range in the Nearctic. Pan-Pacif. Entomol., 66: 43-54.
  26. Sorensen, J.T. 1990. Taxonomic partitioning in discrete-state phylogenies: relationships of the aphid subtribes Eulachnina and Schizolachnina (Homoptera: Aphididae: Lachninae). Ann. Entomol. Soc. Am., 83: 394-408.
  27. Sorensen, J.T. 1989. Homonymy and synonymy in Chaitophorus: C. populifolii (Essig, 1912) versus C. essigi Gillette & Palmer, 1928, and the fate of C. populifoliae Oestlund sensu Davis 1910 (Homoptera: Aphididae). Entomography, 6: 261-268.
  28. Sorensen, J.T. & S.M. Sawyer. 1989. Assessing the multivariate evolutionary responses of phenological differentiation for sibling species: biosystematics in the Macrosteles fascifrons complex (Homoptera: Cicadellidae). Ann. Entomol. Soc. Am., 82: 250-261.
  29. Sorensen, J.T., R.W. Garrison & R.J. Gill. 1989. MEALYBUG, a computer-interactive key to the genera of nearctic Pseudococcidae (Homoptera: Coccoidea). Entomography, 6: 327-334.
  30. Sorensen, J.T, K. Gray, J. Richardson & J. Gerson. 1989. Reorientation of the discussion group. Koy Ahoy, Newsletter of Camellia Koi, Sacramento CA, July 1989. 1 p.
  31. Sorensen, J.T. 1988. Three new species of Essigella (Homoptera: Aphididae). Pan-Pacif. Entomol., 64: 155-125.
  32. Sorensen, J.T. 1988. Why is my pond water green? - a primer on the nitrogen cycle in aqueous environments (part 2). Koy Ahoy, Newsletter of Camellia Koi, Sacramento CA, October 1988. 2 pp.
  33. Sorensen, J.T. 1988. Why is my pond water green? - a primer on the nitrogen cycle in aqueous environments (part 1). Koy Ahoy, Newsletter of Camellia Koi, Sacramento CA, August 1988. 2 pp.
  34. Sorensen, J.T. 1987. Multivariate statistical approach to deduction of phylogeny within Essigiella (sic) (Aphididae: Lachninae), pp. 243-260. In: Holman, J., J. Pelikan, A.G.F. Dixon & L. Weismann (eds.). Population Structure, Genetics and Taxonomy of Aphids and Thysanoptera. Proc. International Symposia, Smolenice Czechoslovakia, Sept. 9-14, 1985. SPB Academic Publishing, The Hague, The Netherlands. 542 pp.
  35. Sorensen, J.T. 1987. The multivariate evolution and taxonomic analysis of leafhopper biotypes and species within species complexes: use of correlated characters and quantitative genetic techniques, pp. 217-234. In: Wilson, M.R. & L.R. Nault (eds.). Second International Workshop on Leafhoppers and Planthoppers of Economic Importance, held in Provo Utah USA, 28th July-1st August 1986. CAB International Institute of Entomology, London. 368 pp.
  36. Sorensen, J.T. (ed.) 1987. Program: 36th Annual Meeting of the Lepidopterists’ Society, June 25-28, 1987, University of California at Berkeley. Berkeley, CA.
  37. Sorensen, J.T. 1985. CRUNCH 3: Addendum to the new MC-DOS modem program. Analysis and Identification Unit, Division of Plant Industry, Calif. Dept. Food & Agric., Sacramento, CA. 1 p.
  38. Sorensen, J. T. 1984. Book Review: Phenetics and Ecology of Hybridization in Buckeye Butterflies (Lepidoptera: Nymphalidae). J. Lepid. Soc., 38: 254-256.
  39. Sorensen, J.T. 1984. CRUNCH 2: The aspiring idiot's guide to using the Analysis & ldentification Compupro computer to searching the Dialog Information Database. Analysis and Identification Unit, Division of Plant Industry, Calif. Dept. Food & Agric., Sacramento, CA. 19 pp.
  40. Sorensen, J.T., D.N. Kinn, & R.L. Doutt. 1983. Biological observations on Bdella longicornis: a predatory mite in California vineyards (Acari: Bdellidae). Entomography, 2: 297-305.
  41. Sorensen, J.T. 1983. CRUNCH: The complete idiot's guide to the most frequently asked questions concerning the CDFA Analysis & Identification Compupro computer. Analysis and Identification Unit, Division of Plant Industry, Calif. Dept. Food & Agric., Sacramento, CA. 19 pp.
  42. Sorensen, J.T. 1980. An integumental anatomy for the butterfly Glaucopsyche lygdamus (Lepidoptera: Lycaenidae): a morphological terminology and homology. Zool. J. Linn. Soc., 70: 55-101.
  43. Powell, J.A., & J.T. Sorensen, (eds.). 1980. 1979 butterfly count results. Supplement to Atala, Volume 7, August 1980. 10 pp.
  44. Sorensen, J.T., D.N. Kinn, R.L. Doutt & J.R. Cate. 1976. Biology of the mite Anystis agilis (Acari: Anystidae), a California vineyard predator. Ann. Entomol. Soc. Am., 69: 905-91 0.
  45. Sorensen, J.T., D.N. Kinn & R.L. Doutt. 1975. Cage for observing and rearing small arthropods. Pan-Pacif. Entomol., 51: 256-258.
  46. Kinn, D.N., J.L. Johannes, R.L. Doutt, J.T. Sorensen & M.J. Foskett. 1974. Effects of Tetranychus pacificus and irrigation practices on yield quality of grapes in north coast vineyards of California. Environ. Entomol., 3: 601 -606.
  47. Masters, J.H. & J.T. Sorensen. 1969. Field observations on forest Oeneis (Satyridae). J. Lepid. Soc., 23: 155-161.
  48. Sorensen, J.T. 1969. A survey of the Notodontidae present in the University of Minnesota collection as of 27 January 1967. Assoc. Minn. Entomol., Mid-Continent Lepidoptera Series, 1.
  49. Masters, J.H., & J.T. Sorensen. 1968. A new subspecies of Oeneis jutta (Lepidoptera, Satyridae). Entomol. News, 79: 80-84.
  50. Masters, J.H., & J.T. Sorensen. 1968. Bionomic notes on the satyrid butterfly Oeneis macounii at Riding Mountain, Manitoba. The Blue Jay (J. Sask. Nat. Hist. Soc.), 26: 38-40.
  51. Masters, J.H., J.T. Sorensen & P.J. Conway. 1967. Observations on Oeneis macounii in Manitoba and Minnesota. J. Lepid. Soc., 21: 258-260.
  52. Sorensen, J.T. 1967. Palaeacrita speciosa Hulst (Geometridae) in Minnesota. J. Lepid. Soc., 21: 57-58.
  53. Sorensen, J.T. 1967. Conservation - the reasons for extinction. Bull. Assoc. Minn. Entomol., 2: 45-46.
  54. Sorensen, J.T. 1967. A method of storing papered specimens. Bull. Assoc. Minn. Entomol., 2: 44.
  55. Sorensen, J.T. 1966. Collecting sphingid's by car. Newsletter Assoc. Minn. Entomol., 1: 44.
  56. Sorensen, J.T. 1966. The Heterocera of Minnesota, part 1: Saturniidae. Newsletter Assoc. Minn. Entomol., 1: 25-27.
  57. Sorensen, J.T. 1966. The Rhopalocera of Fort Snelling, part 1: Papilionidae. Newsletter Assoc. Minn. Entomol., 1: 10-14.
  58. Sorensen, J.T. 1966. The Saturniidae of Minnesota. Bull. Amat. Entomol. Soc.
  59. Sorensen, J.T. 1964. A honey-agar feeding method for Lepidoptera. Bull. Amat. Entomol. Soc.

Theses

  1. Sorensen, J.T. 1983. Cladistic and phenetic analysis of Essigella aphids: Systematics and phylogeny in relation to their Pinaceae host plants (Homoptera: Aphididae, Lachninae). Ph.D. Thesis, Univ. of California, Berkeley. 605 pp.
  2. Sorensen. J.T. 1972. An integumental morphology of the Glaucopsychini (Lepidoptera: Lycaenidae). M.A. Thesis, Univ. of Northern Iowa, Cedar Falls. 96 pp.

Presentations

  • Sorensen, J.T. “Current overview of RIFA eradication structure and border station ant interceptions in California”. (Informal Group Discussion Member): Red Imported Fire Ant Discussion Group. 2007 International Pacific Invasive Ant Conference, Kona, HI, May 2007
  • Sorensen, J.T. “Red Imported Fire Ant Diagnostics and Variation”: RIFA Eradication Training Session, PD/EP Branch, CDFA, Costa Mesa CA, November 2006. (invitational).
  • Sorensen, J.T. “Commonly encountered ants at California Border Stations”: CDFA Agricultural Border Station Training Sessions, Exclusion Branch, CDFA, Blythe CA, October 2006. (invitational).
  • Sorensen, J.T. “Commonly encountered ants at California Border Stations”: CDFA Agricultural Border Station Training Sessions, Exclusion Branch, CDFA, Needles CA, October 2006. (invitational).
  • Sorensen, J.T. “Commonly encountered ants at California Border Stations”: CDFA Agricultural Border Station Training Sessions, Exclusion Branch, CDFA, Yreka CA, September 2006. (invitational).
  • Sorensen, J.T. “Commonly encountered ants at California Border Stations”: CDFA Agricultural Border Station Training Sessions, Exclusion Branch, CDFA, Truckee CA, August 2006. (invitational).
  • Sorensen, J.T. "DNA sequencing for diagnostics". Symposium: DNA use in the plant pest diagnostics. Plant Pest Diagnostics Center, California Dept. of Food & Agriculture, Sacramento. May 1998. (invitational).
  • Sorensen, J.T. "A new Homalodisca vector in California". Oleander Scorch Symposium. University of California Cooperative Extension, Riverside, California. March 1996. (invitational).
  • Sorensen, J.T. "Problems in koi keeping." (Discussion Panel Member): Camellia Koi, Sacramento CA, (at Auburn CA) January 1990. (invitational).
  • Sorensen, J.T. "Russian wheat aphid in California." Sutter Buttes Agriculture Farm Advisors meeting, Yuba City, CA, May 1989. (invitational).
  • Sorensen, J.T. "A primer on koi pond building." Camellia Koi, Sacramento CA, (at El Dorado Hills CA) January 1989. (invitational).
  • Sorensen, J.T. "Why is my pond water green? - a primer on the nitrogen cycle in aqueous environments." Camellia Koi, Sacramento CA, August 1988. (invitational).
  • Sorensen, J.T. Co-organizer and Co-Chairman. Session IW-1: Workshop on ordination techniques in entomological systematics: their uses and quantitative genetic rationales for providing group discrimination and determining evolutionary distances and relationships. XVlll International Congress of Entomology, University of British Columbia, Vancouver, British Columbia, Canada. July 1988
  • Sorensen, J.T. & R.G. Foottit. "Ordinations, a third (non-phenetic) analytical alternative in systematics: their contrast to clustering and cladistic techniques." Session IW-1: Workshop on ordination techniques in entomological systematics: their uses and quantitative genetic rationales for providing group discrimination and determining evolutionary distances and relationships. XVlll lnternational Congress of Entomology, University of British Columbia, Vancouver, British Columbia, Canada. July 1988
  • Sorensen, J.T. "Ordinations as inferential tools for phylogenetic and phenological assessments: The pragmatic potential and problems of deciphering evolution in n-dimensional space." Session IW-1: Workshop on ordination techniques in entomological systematics: their uses and quantitative genetic rationales for providing group discrimination and determining evolutionary distances and relationships. XVlll International Congress of Entomology, University of British Columbia, Vancouver, British Columbia, Canada. July 1988
  • Sorensen, J.T. Program Chairman: Northern California Entomology Club, 1987-88.
  • Sorensen, J.T. Program Co-Chairman: 36th National meeting of the Lepidopterists' Society. University of California, Berkeley, CA, June 1987.
  • Sorensen, J.T. Moderator: Session 2, Systematics and Morphology. 36th National meeting of the Lepidopterists' Society. University of California, Berkeley, CA, June 1987.
  • Sorensen, J. T. & K.H. Sorensen. "Sex and comfort: the ultimate goal of behavioral evolution in papilionoids." National meeting of the Lepidopterists' Society. University of California, Berkeley, CA, June 1987
  • Sorensen, J.T. & J.A. Powell. Differentiation of brachypterous syndromes in scythrid moths (Gelechioidea): quantitative genetic aspects of wing dimensions. National meeting of the Lepidopterists' Society. University of California, Berkeley, CA, June 1987
  • Sorensen, J.T. "Discriminant analysis of Macrosteles leafhopper sibling species: a demonstration of the use of Biostat-ll and MacSpin." Meeting of the Association of Biologists in Computing. California State University at Fullerton, Fullerton, CA, January 1987.
  • Sorensen, J.T. & S.M. Sawyer. "Discriminant analysis of Macrosteles leafhopper sibling species in California." Informal Auchenorrhyncha Conference. National meeting of the Entomological Society of America, Reno, NV, December 1986. (invitational).
  • Sorensen, J.T. Organizer and Moderator: Section 'A' Symposium on biogeography and geographic variation in nearctic insects. National meeting of the Entomological Society of America, Reno, NV, December 1986. (invitational).
  • Sorensen, J.T. "Opening remarks: time, space and inferential analysis." Section 'A' Symposium on biogeography and geographic variation in nearctic insects. National meeting of the Entomological Society of America, Reno, NV, December 1986.
  • Sorensen, J.T. "Geographic variation in two species complexes of Essigella in western North America (Homoptera: Aphididae)." Section 'A' Symposium on biogeography and geographic variation in nearctic insects. National meeting of the Entomological Society of America, Reno, NV, December 1986.
  • Sorensen, J.T. “Grape Phylloxera in California” (Panel member): California Plant Diseases of Grape Conference, Santa Rosa, CA, November 1986. (invitational).
  • Sorensen, J.T. "The multivariate evolution and taxonomic analysis of leafhopper biotypes and species within species complexes: use of correlated characters and quantitative genetic techniques." Second lnternational Workshop on Leafhoppers and Planthoppers of Economic Importance (Commonwealth Institute of Entomology). Brigham Young University, Provo, UT, July 1986. (invitational).
  • Sorensen, J.T. "A multivariate statistical approach to deduction of phylogeny within Essigella (Aphididae: Lachninae)." Section: New approaches to aphid taxonomy and identification. International Symposium on Population Structure, Genetics and Taxonomy of Aphids. Smolenice, Czechoslovakia, September 1985.
  • Sorensen, J.T. "Problems with the use of UPGMA linkage clustering algorithms and character encodings schemes in aphid taxonomy." Section: New approaches to aphid taxonomy and identification. International Symposium on Population Structure, Genetics and Taxonomy of Aphids. Smolenice, Czechoslovakia, September 1985.
  • Sorensen, J.T. "The use of computers in entomology: applications in systematics." Northern California Entomology Club, Sacramento, CA, May 1985. (invitational).
  • Sorensen, J.T. "The use of Discriminant Function Analysis for phylogenetic deduction." Symposium on the use of continuous characters in phylogenetic inference. 18th International Numerical Taxonomy Conference, Cornell Univ., Ithaca, NY, October 1984. (invitational).
  • Sorensen, J.T. "The use of ordinations in phylogenetic inference: and example with Essigella aphids." Systematics seminar, Dept. of Entomological Sciences, University of California, Berkeley, CA, May 1984. (invitational).
  • Sorensen, J.T. "Applications of quantitative systematics and phylogenetic inference: the systematics of Essigella aphids." Departmental seminar, Dept. of Entomology, University of California, Riverside, CA, April 1984. (invitational).
  • Sorensen, J.T. "A multivariate statistical phylogeny for Essigella (Homoptera: Aphididae)." National meeting of the Entomological Society of America, Detroit, MI, November 1983.
  • Sorensen, J.T. "A guided tour of the Lycaenid head." National meeting of the Lepidopterists' Society, University of California, Davis, CA, August 1979.
  • Sorensen, J.T. "The morphology of the sulci on the legs of Lycaenidae." National meeting of the Lepidopterists' Society, University of California, Davis, CA, August 1979.
  • Sorensen, J.T. "The ecological relationship of Oeneis to the Alaskan oil pipeline." National meeting of the Lepidopterists' Society, University of California, Davis, CA, August 1979.
  • Sorensen, J.T. "Biology of the mite Anystis agilis (Acari: Anystidae), a California vineyard predator." 1st Annual meeting of the American Arachnological Society, San Francisco State University, San Francisco, CA, July 1976.
  • Sorensen, J.T. "An integumental morphology of adult Glaucopsychini (Lepidoptera: Lycaenidae)." National meeting of the Lepidopterists' Society, Trinity University, San Antonio, TX, June 1972.
  • Sorensen, J.T. "The ecology of forest Oeneis (Lepidoptera: Satyridae)." National meeting of the Lepidopterists' Society, Michigan State University, East Lansing, MI, June 1969.

Awards & Commendations

  • 1997, Certificate of Appreciation: Karnal Bunt Eradication Program, U. S. Dept. of Agric.
  • 1997, Letter of Commendation: Karnal Bunt Eradication Program, Calif. Dept. of Food & Agric.
  • 1991, Certificate of Appreciation: 1990 California Medfly Eradication Project, Calif. Dept. of Food & Agric.
  • 1974-1976, National Institute of Health Training Fellowship: Dept. of Entomol. Sci., Univ. of Calif., Berkeley
  • 1972, Thomas Say Scholarship for Research, lowa Lakeside Research Laboratory, Univ. of lowa

Committees / Offices / Organizational Involvement

  • 2001, Member, Hiring Committee for Associate Insect Biosystematist, Plant Pest Diagnostic Center, California Dept. of Food & Agriculture
  • 1999, Member, Hiring Committee for Associate Plant Nematologist, Plant Pest Diagnostic Center, California Dept. of Food & Agriculture
  • 1997-2001, Core Member, Strategic Plan Committee, Plant Pest Diagnostic Center, California Dept, of Food & Agriculture
  • 1997-2001, Chairman, Strategic Plan Subcommittee for Scientific Advancement, Plant Pest Diagnostic Center, California Dept. of Food & Agriculture
  • 1997-1999, Member, Exotic Pest Research Contract Review Committee, Division of Plant Health and Pest Prevention Services, California Dept. of Food & Agriculture
  • 1997, Member, Pest Exclusion Key Results Area Review Committee, Division of Plant Health and Pest Prevention Services, California Dept. of Food & Agriculture
  • 1995, Panel Member, Agricultural Biotechnician Examination, Plant Pest Diagnostic Center, California Dept. of Food & Agriculture
  • 1989-1995, Editor, Pan-Pacific Entomologist, Pacific Coast Entomological Society
  • 1988-1989, Member, Preliminary Organization Committee for Project ARTISYST ("Uses of Artificial Intelligence and modern computer methods for systematic studies in biology"). National Science Foundation Workshop, Dept. of Nematology, University of California, Davis, Davis CA
  • 1988, Chairman, Program Committee, Northern California Entomology Club
  • 1988, Co-organizer and Co-Chairman. Session IW-1 Workshop on ordination techniques in entomological systematics: their uses and quantitative genetic rationales for providing group discrimination and determining evolutionary distances and relationships. XVlll International Congress of Entomology, Vancouver, British Columbia
  • 1987, Co-Chairman: Program Committee for 36th National Meeting, The Lepidopterists' Society, Univ. of California, Berkeley, Berkeley CA
  • 1984-1987, Member, Computer Committee, Analysis & Identification Branch, California Dept. of Food & Agriculture
  • 1977-1978, Graduate Assembly Representative, Departmental Review Committee for the Dept. of Mechanical Engineering, Graduate Division, Univ. of California, Berkeley
  • 1977, Graduate Student Representative, Search Committee for Position of Insect Pathologist, Dept. of Entomological Sciences, Univ. of California, Berkeley
  • 1976-1977, Graduate Student Representative, Library Acquisitions Committee, Dept. of Entomological Sciences, Univ. of California, Berkeley
  • 1972-1976, Chief Counselor, The Xerxes Society for Conservation of Endangered Arthropods
  • 1966-1969, President, Association of Minnesota Entomologists

Consulting / Advising / Reviewing Services (partial list)

  • 2006, Consultant on Aphis caccivora, to Univ.of  California, Davis
  • 2006, Consultant on Aphis gossypii to Univ. of California, Davis
  • 2001, Reviewer on Promotion, USDA-ARS
  • 2000, Consultant on Aphis craccivora, to Univ. of California cooperative Extention, California alfalfa industry.
  • 1999, Consultant on Hyadaphis coriandi' (Coriander Aphid), to California Dept. of Food & Agriculture; California counties
  • 1998-2005, Consultant on Nasonovia ribis-nigra (Lettuce Aphid), to California Dept. of Food & Agriculture; California counties; Univ. of California, Univ. of Arizona.
  • 1997-present, Consultant on Solenopsis invicta (Red Imported Fire Ant) to California Dept. of Food & Agriculture; California counties, cities, vector control agencies; USDA-APHIS
  • 1997, Consultant on Aphis gossypii (Cotton aphid) to Integrated Pest Management Branch, California Dept. of Food & Agriculture
  • 1996-1997, Consultant on Hornalodisca coagulata (Glassey-winged Sharpshooter) to California Dept. of Food & Agriculture; California counties, California grape industry.
  • 1996-1997, Consultant on Sirex longicauda (Longtailed Sawfly) to California counties; California home building industry
  • 1993-1997, Consultant on phylogenetic analysis procedures for 18s rDNA to USDA-ARS, Western Regional Resources Center
  • 1993-1997, Consultant on Toxoptera citracida (Brown Citrus Aphid) to California Dept. of Food & Agriculture; Univ. of California; Central Valley Tristezea Eradication Agency.
  • 1993, Committee Member, The Brown Citrus Aphid Task Force Technical Resources Group, California Dept. of Food & Agriculture
  • 1991, Consultant and Testifying Witness to Session on Dakulospharia vitifoliae (Grape phylloxera), 9 December 1991 California Legislature, Senate Committee on Agriculture and Water Resources,
  • 1991, Landscaping Consultant for regionally appropriate plants, to Architectural Control Committee, El Dorado Hills, El Dorado Hills Community Servies District, El Dorado County, California.
  • 1990, Advisor on horticultural plants as Medfly hosts, to California Medfly Eradication Project, California Dept. of Food and Agriculture
  • 1986-1990, Reviewer of Japan-United States Cooperative Grant Program Proposals for the National Science Foundation
  • 1989-1990, Consultant on Diuraphis noxia (Russian wheat aphid) to California Dept. of Food & Agriculture; California counties
  • 1989-1990, Consultant on Brachycorynella asparagi (Asparagus aphid) to California Dept. of Food & Agriculture; California counties
  • 1986-present, Reviewer of Systematic Biology Grant Proposals for the National Science Foundation
  • 1986, Advisor for tenure recommendation, to the Section of Faunistic Surveys and Insect Identifications, Illinois Natural History Survey,
  • 1985, Advisor on evolution and biology of aphidoid biotypes, to the Grape Phylloxera Biotype B Research Steering Committee, California Dept. of Food & Agriculture
  • 1985, Advisor on discriminant analysis and evolutionary biology, to the African Bee Eradication Project, for California Dept. of Food & Agriculture
  • 1985, Reviewer of USDA.Competitive Grant Proposals for the USDA, Science & Education Administration
  • 1984, Consultant on Daktulospharia vitifoliae (Grape Phylloxera), to California Dept. of Food & Agriculture; California counties; Univ. of California
  • 1984, Advisor on pesticide application and habitat, to the California Japanese Beetle Eradication Project, for California Dept. of Food & Agriculture
  • 1983-present, Reviewer of manuscripts for: Agriculture Canada, Research Branch; Annals of the Entomological Society of America; Canadian Entomologist; Elsevier Science Publications; Entomography, An Annual Revue of Biosystematics; Florida Entomologist; Illinois Natural History Survey; Journal of Economic Entomology; Journal of the Lepidopterists' Society; Journal of Medical Entomology; Occasional Papers, Calif. Dept. Food & Agric.; Pan-Pacific Entomologist; Plenum Press; USDA, Agricultural Research Service; USDA, Science and Education Administration.
  • 1983, Advisor on Beet Leafhopper biology, to the Curly Top Virus Research Steering Committee, California Dept. of Food & Agriculture
  • 1983, Consultant on Eucarazzia elegans (Mediterranean Mint Aphid) USDA-APHIS-PPQ; California Dept. of Food & Agriculture; California counties
  • 1981, Analyst, Workshop on the Theory and Application of Cladistic Methodology, National Science Foundation, Washington, DC; at Dept. of Botany, Univ. of California, Berkeley.

CDFA Eradication Project Involvement

  • 2001-present, Red Imported Fire Ant Project, Orange County CA
  • 1998, Red Imported Fire Ant Project, Fresno Co CA
  • 1997, Red Imported Fire Ant Project, Kern County CA
  • 1996, Karnel Bunt Project, El Centro, CA
  • 1990, Medfly Project, Los Angeles CA
  • 1985, African Bee Project
  • 1984, Japanese Beetle Project, Orangevale CA

Museum Visits

  • 1966-1972, University of Minnesota Insect Collection, University of Minnesota, St. Paul, Minnesota
  • 1968, James Ford Bell Museum of Natural History, University of Minnesota, Minneapolis, Minnesota
  • 1969, Arthropod Museum, University of Arkansas, Fayetteville, Arkansas
  • 1968, J.B. Wallis Museum of Entomology, University of Manitoba, Winnipeg, Manitoba
  • 1968, Entomology Museum, Michigan State University, East Lansing, Michigan
  • 1968, Insect Research Collection, University of Wisconsin, Madison, Wisconsin
  • 1968, The University of Colorado Museum, University of Colorado Museum, Bolder, Colorado
  • 1968, The University of Wyoming Insect Museum, University of Wyoming, Laramie, Wyoming
  • 1970, The Field Museum, Chicago, Illinois
  • 1970-present, Essig Museum of Entomology, University of California, Berkely, California
  • 1971, Snow Entomological Research Collection, Univ. of Kansas Nat. Hist. Museum, Lawrence, Kansas
  • 1971-72, Insect Collection, Dept. of Entomology, Iowa State University, Ames, Iowa
  • 1973-present, California Academy of Sciences, San Francisco, California
  • 1976, National Museum of Natural History, Washington DC
  • 1976, The Academy of Sciences, Philadelphia, Pennsylvania
  • 1976, American Museum of Natural History, New York, New York
  • 1978, M.T. James Entomological Collection, Washington State University, Pullman, Washington
  • 1978, W.F. Barr Entomological Museum, University of Idaho, Moscow
  • 1978, E.H. Strickland Entomological Museum, University of Alberta, Edmonton, Alberta
  • 1978, Montana Entomology Collection, Montana State University, Bozeman, Montana
  • 1978, Insect Collection, Dept. of Biology, Utah State University, Logan, Utah
  • 1978, C.P. Gillette Museum of Arthropod Biodiversity, Colorado State University, Fort Collins, Colorado
  • 1979, University of the North, University of Alaska, Fairbanks, Alaska
  • 1980-present, California State Collection of Arthropods, Calif. Dept. Food & Agric, Sacramento, California
  • 1980, The Natural History Museum, London
  • 1980, Center of Aphid Systematics, Bennekom, Netherlands
  • 1983, Illinois Natural History Survery, Urbana, Illinois
  • 1983-present, Bohart Museum of Entomology, University of California, Davis, California
  • 1984, Cornell University Insect Collection, Cornell University, Ithaca, New York
  • 1984, 1993, Canadian National Collection of Insects, Arachnids and Nematodes, Ottawa, Ontario
  • 1984, Oregon State Arthropod Collection, Oregon State University, Corvallis, Oregon
  • 1984, Entomology Research Museum, University of California, Riverside, California
  • 1986, Monte L. Bean Museum Life Sciences Museum, Brigham Young Museum, Provo Utah
  • 1988, George J. Spencer Entomological Museum, Univ. of British Columbia, Vancouver, British Columbia
  • 1988, The Royal British Columbia Museum, Victoria, British Columbia
  • 2007, Bernice P. Bishop Museum, Honolulu, Hawaii

Field Experience

  • CANADA: Alberta, British Columbia, Manitoba, Ontario, Quebec, Saskatchewan, Yukon.
  • USA (45 states): AK, AR, AL, AZ, CA, CO, CT, DE, GA, HI, IA, ID, IL, IN, KS, KY, MA, MD, MI, MN, MO, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VI, VT, WA, WI, WY.
  • EUROPE: England, Czech Republic, Germany, Netherlands, Slovakia