If downy mildew and powdery mildew are present on grapevine leaves at harvest, control measures should be considered at that time to prevent early leaf drop and help vines properly acclimate for winter. Post-harvest vineyard management of downy and powdery mildew is critical as these diseases can appear late in the season and reduce photosynthesis, defoliate vines, and increase the …
Terrence Wilson: Re repellent sprays, which ones? How close to harvest can they be used, and what...