Grape powdery mildew can damage the green parts of fruits, leaves and new shoots, and is one of the important diseases of grapes.
?? Symptoms of fruit damage, first in the fruit surface to produce a gray powdery mildew, wiped off the white powder, the epidermis showed a brown pattern, and finally the epidermal cells become dark brown, vulnerable young fruit cracking.
The leaves suffer damage and produce a grayish white powdery mildew on the surface of the leaf, which spreads gradually to the entire leaf. In severe cases, the diseased leaf curls and withers. The new vines were damaged and they showed small gray spots at the beginning. After the spread of the vines, the whole vine spread. The diseased vines changed from gray to dark gray and finally black.
? The characteristics of the disease? Pathogens are Ascomycota genus. The asexual generation belongs to the fungus class Fungi. Pathogens use mycelium to overwinter on damaged tissues or in bud Scales. A spring robe is produced in the spring of the following year. It spreads to the surface of the host by wind. The STERILIZER on the mycelium directly penetrates into host cells to absorb nutrients. The mycelium is on the surface of the host. Spread, the fruit surface, branches and leaves were dark brown, mainly by the suction device. Diseases generally occur from the middle of July to the middle of September to October.
?? Prevention methods
1. Strengthen cultivation and management, increase organic fertilizers, strengthen tree vigor, and increase resistance to disease; timely picking the heart, thinning off dense leaves and vines, and maintaining good ventilation and light transmission can reduce the occurrence of diseases.
2. Pay attention to the health of the orchard, remove the diseased body, concentrate burned or buried deeply, and reduce the source of bacteria.
3, before the germination should be sprayed 3-5 Baume degree of lime sulfur agent, after germination spray 0.2-0.5 Baume degree of lime sulfur, or 50% thiophanate 500 times, or 70% thiophanate-methyl 1000 times Liquid, or 25% triadimefon WP 1000 times, DuPont Fuxing, benomylazole, and the world's advanced fungicides are effective against powdery mildew.
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