Grape downy mildew is one of the major diseases of grapes. Due to the different weather conditions each year, the degree of harm varies. Severely affected years can cause a large number of deciduous grapes, fruit spoilage, poor growth of new shoots, poor maturity, and reduced fruit yield and quality. Due to early defoliation, malnutrition within the plant resulted in a large number of plant deaths. The pathogenic bacteria are mainly borne by oospore in diseased tissues or in the soil with diseased leaves. It is also possible for the mycelia to overwinter in the live leaves of bud scales.
Control methods:
1. Completely remove the source of the disease: In combination with the winter cut, cut off the diseased branches and diseased ears, clean up the litter, and transport them out of the shed (outside the park) to burn them.
2. Chemical control:
(1) Before the occurrence of the disease, spray once every 10 to 15 days with 1:0.7: 200 times Bordeaux mixture or 35% basic copper sulfate suspension 400 times.
(2) After the occurrence of the disease, the fungicide with a certain systemic effect is sprayed to control the spread of the disease. The commonly used agents are: 40% EB aluminum wettable powder 200-300 times; 25% thioredox mold wettable powder 500- 800 times liquid; 58% thiazole WP WP 400-600 times; 50% cedertan wettable powder 500 times; or 40% EB aluminum and captan WP 500-800 times mixture 65% of Sensen Zinc 200-300 times; 25% of Dactylium 200g plus 65% of 250mg of Zeocene 250g mixture. Since the single use of one or two kinds of pharmaceuticals is easy to produce resistance, it should be used in rotation. When the spray is mainly on the back of the leaf, it is necessary to thoroughly spray it thoroughly to control its harm.
For an orchard that has already taken place, with 40% diethylaluminophosphate, or 25% thiometheus, 50% captan, etc. After 2-3 times of treatment, the disease can be controlled after 15 days Spray a 1:0.7:200-fold Bordeaux mixture with 2000 times the skin glue (adhesive) to protect the leaves.
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