Symptoms of Pierce's disease on a leaf. (Picture from University of California.)
Symptoms of Pierce's disease in a vineyard. (Picture from University of California.)
Symptoms of Pierce's diseaseon grape leaves in a Temecula vineyard. (Picture from Phil A Phillips,UCCE Area IPM Advisor.)
Symptoms of Pierce's disease on leaves. (Picture from University of California.)
Pierce's disease symptoms delay spring growth in a vineyard. (Picture from University of California.)
Pierce's disease in a red globe grape vineyard in August. (Picture from Jennifer Hashim.)
Pierce's disease on red globe grapes. (Picture from University of California.)
Uneven wood maturity and persistant petioles. (Picture from University of California.)
Aerial of vineyard with Pierce's disease. (Picture from University of California.)