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
Figure 1 – Dead spurs are found even in the dormant season. This dead spur, photographed in December, is flanked by spurs with canes. (Photo by Kendra Baumgartner)
Figure 2 – Stunted shoots are most apparent in early summer. Healthy-looking shoots continue to grow, but shoots on infected spurs (2nd spur from the end of this cordon) start to die. (Photo by Larry Bettiga).
Figure 3 – Internal wood symptoms are found year round. Cross-sectional cuts of the permanent woody structure of the vine (spurs, cordons, or trunk) expose cankers that vary widely in shape, color, and texture. (Photos by Renaud Travadon).
Main Botryosphaeria Dieback Pathogens: Neofusicoccum parvum
Diplodia seriata
Lasiodiplodia theobromae
Botryosphaeria dothidea
Phomopsis Dieback
Figure 10 – Characteristic leaf symptoms of Phomopsis cane & leaf spot appear in early spring, on lower leaves of infected shoots. (Photo by Mizuho Nita)
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.
Click here to learn about Preventing trunk diseases in young vineyards and Managing symptomatic mature vineyards
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