Authors: Tony K. Wolf and John D. Boyer, Professor of Viticulture and Lecturer, Virginia Tech
Publication Number 463-020, December 2003
Figure 13. Symptoms of Pierce's Disease. From top: marginal leaf scorch; shedding of leaves, often with petioles adhering to stems; young trunk cut cross-sectionally to reveal darkened inclusions in xylem; and severely affected vine showing loss of vigor and defoliation.
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