CropsMain symptoms
Pilidiella diplodiella grape mainly affects the clusters and twigs, rarely the leaves.
- Symptoms on berries appear before and after veraison. Before veraison, the berries take on a livid hue, pinkish beige to purplish beige; the phenomenon entirely affects the berries which gradually wilt (Figures 1 to 6). Small protuberances appear on the surface of the berries: pycnidia of the fungus (Figures 7 to 9 and 17). Quite quickly, the berries shrivel up and dry out (Figures 2 to 8). Some of them fall to the ground while others remain attached to the stalk (figure 4). The whitish color of the berries is due to a peeling of the skin of the epidermal tissues following the parasitism of P. diplodiella . This fungus can also reach the pedicels and then invade the stalk, sometimes causing wilting and partial drying of the bunch (Figure 3).
- Lesions on pedicels and twigs are more or less elongated and depressed, brownish in color; affected tissues at the periphery are dark brown to blackish (Figures 10 to 17). The alterations can also be canker, surrounded by bands of scar tissue causing the bark to burst into rather characteristic strips (Figures 10, 11, 15 and 16). Note that the alterations on green shoots are localized around the nodes (figures 12, 13 and 16).
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