[A review of means of infection of Botrytis rot in grapes]
1985
Najjar, H.
Proper timing for treatment of Botrytis rot of grapes is closely related to periods of infection. Conidia are produced by overwintering Sclerotia and seem to grow best at relative humidity above 90% and temperatures of 15-20 degrees C. Infection takes place mainly in spring when grapes are in flower, and flower parts are the main site for infection. Stamens die and some remain attached to the bunches and form a later source of infection. Stigmas, however, are the main entrance. Here the conidial tube grows down the style to reach an abscission layer near the ovary which it cannot penetrate. So it remains in a state of latency until time of veraison. At this period the latent mycelia grow and somehow penetrate the said layer and cause the known gray rot. Conidia are abundant at veraison and at full ripening of the grapes. Further treatment is needed at these periods. On mature grapes mycelia can easily pass from a diseased grape to adjacent healthy ones and thus spread the disease. Suggestions are given for research on various phases of treatment in early spring
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