Measures to Prevent Grape Downy Mildew
Grape downy mildew is one of the important diseases of grape. It can occur in all parts of China. It mainly damages the leaves and causes early defoliation. It can also harm new shoots and ear. The main symptoms are characterized by the formation of a polygonal macular on the front of the leaves, withered later in life, with a brownish color and a white downy mildew on the back. Grape downy mildew is a kind of fungal disease. The oospore of pathogenic bacteria in the diseased tissue or the diseased body is overwintering in the soil, and a few can also winterize in buds in the form of mycelia. During the grape growing season, the disease generally begins with the lower leaves; the spores of the disease spread by wind and rain. In the weather conditions of large temperature difference between day and night, rainy and dewy, 7-12 days will be able to breed a generation, so the disease becomes very popular. Northern China, such as Hebei Province, usually begins disease in mid-June, and July is the epidemic period. At present, attention should be paid to monitoring the occurrence of diseases, and chemical control measures should be taken in the early stages of the disease. During the fruit swell period (June-July), the following agents can be sprayed on the foliar: 1 Copper preparations such as copper hydroxide, such as 77% can kill wettable powder 400-500 times, and sterilization copper water 400-500 times. Liquid; 21:0.5 Bordeaux mixture 160-200 times (note that grape is sensitive to lime, can not use the same amount or multiple formula); 364% antivirus WP (oxoraxen and mancozeb compound) 500 -600 times liquid; 490% triethylaluminum phosphate (Syrup); Wettable powder 600-700 times; 570% Prosin Zinc (Antai) Wettable powder 500-700 times; 625% Metalaxyl (Swiss Poison mold, Ledomil) Wettable powder 1000 times. Or use their compound, such as 72% cyanomethrin (formulacyanuron and mancozeb compound) 600-800 times, 60% Foma (complex of morphine and mancozeb) 500 - 1000 times liquid, 60% of Rububa (propene zinc and cymoxan mixed) 500-600 times liquid. Generally need to control 2-3 times. Comprehensive prevention and control of grape downy mildew should also include the following measures: 1. Do a good job of orchard hygiene, especially when pruning and vines are unearthed on shelves, remove the diseased fruit, diseased leaves, litter, and diseased branches that have been trimmed down; After the shelves are unearthed, the vines and the ground are “disinfected†in time to reduce the pathogenic bacteria that have passed winter. 2-3 Baume degrees of lime sulfur can be used or 40% of Formamide arsenic wettable powder can be 100 times crystallite sulfur 50 times. Gift Packaging Trays,Blister Packaging Box,Gift Blister Packaging,Custom Makeup Packaging taicang hexiang packaging material co.,ltd , https://www.medpackhexiang.com