Key Technical Points for Grape Disease Control During the Plum Rain Season
Using B9 and paclobutrazol on Kyoho grapes to improve fruit set easily causes side effects such as shorter flower clusters and smaller berries. Therefore, a method that allows Kyoho to set fruit well without making the fruit stalks hard or the berries small has long been desired. After years of trials, we adopted forchlorfenuron produced by Lanyue Technology Company of the Sichuan Academy of Agricultural Sciences to improve fruit set...
In June, grapes enter the young fruit growth stage, which coincides with the Plum Rain season. Hot, humid weather favors the occurrence and spread of diseases. The main grape diseases include downy mildew and powdery mildew, which damage leaves, and black pox, rachis blight, anthracnose, and white rot, which damage fruit. When controlling them, attention should be paid to selecting the right pesticide types and mixing them for use, taking into account both leaf diseases and fruit diseases.Generally, about 3 consecutive applications are made, with an interval of 7-10 days. Before bagging in early June, spray with Score 10% difenoconazole water-dispersible granules (1000-1500 times dilution) plus Amistar 25% azoxystrobin suspension concentrate (2500 times dilution). In mid-to-late June, use 80% mancozeb wettable powder (600 times dilution) plus 50% dimethomorph wettable powder (1500-2000 times dilution), or 70% thiophanate-methyl wettable powder (1000 times dilution) plus Kebo 78% Bordeaux? mancozeb wettable powder (400-500 times dilution) or 80% Bordeaux mixture wettable powder (400-500 times dilution) for spraying. If insect control is needed during disease prevention, add 10% beta-cypermethrin suspension concentrate (3000 times dilution) or 2.5% emamectin benzoate water-dispersible granules (2000-3000 times dilution) to the spray solution. Note to alternate pesticides and apply them before rain as much as possible. In continuous rainy weather, apply pesticide promptly after the rain to make up the treatment.