Botryosphaeria dieback and Phomopsis dieback
Botryosphaeria dieback and Phomopsis dieback have no diagnostic canopy symptoms. Instead, they are best characterized by one or more of the general symptoms (Figures 1, 2, and 3)
Symptoms of Botryosphaeria Dieback
Main Botryosphaeria Dieback Pathogens: Neofusicoccum parvum
Main Phomopsis Dieback Pathogen: Phomopsis viticola*
*Phomopsis viticola also causes Phomopsis cane & leaf spot, a disease with diagnostic canopy symptoms (Figure 10). However, the relationship between canopy symptoms of Phomopsis cane & leaf spot and wood symptoms of Phomopsis dieback is not well understood.
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