Prevent grape black spot disease in rainy season in spring and summer

Grape black pox, also known as scab, commonly known as bird eye disease. It is distributed throughout the country. In the spring and summer, the incidence is severe when it is wet and wet.

Blackpox mainly harms the young part of the grapes, if it is true, fruit stems, leaves, petioles, new shoots. When observing this disease, it is most intuitive to look at the tender leaves. Blackpox is manifested on the leaves, starting with brown spots like needles with yellow halos around them. Then, the spots expanded in a circular or irregular shape. The center is grayish white, slightly sunken, with brown or purple edges and 1 to 4 mm in diameter. When severe, young leaves are dark and scorch.

The pathogen of the black pox is the grape cyst. It belongs to the genus Ascomycota, asexual phase of the grape spores of the genus Aspergillus, belonging to the subphylum Aspergillus. The pathogenic bacteria mainly lurk in diseased vines, diseased shoots and other tissues during the winter. In the second year of April and May, new spores were produced. By rain and rain, young shoots and young leaves were first infested and gradually spread.

The epidemic of blackpox is closely related to rainfall and air humidity. In the early summer of spring (April-June), if the rain is high, the disease is most serious.

Control measures:

1. Seedling disinfection. When planting the garden, it is necessary to purchase the disease-free seedlings in the authentic scientific research units to ensure safety. Once the seedlings are disinfected, disinfect with 3% to 5% of copper sulfate.

2. Clear Garden. After the winter cut and before the budding in the spring, the clean gardens were once cleaned and the dead branches, fallen leaves, and rotten fruits were cleaned out of the park.

3. Drug control. When spring grape buds will sprout in spring, the whole garden will spray 3 times to 5 degrees lime sulfur and 200 times liquid sodium pentachlorophenol to spray all the trees, columns, iron wire and ground. The new shoots will grow to 7~ 8 sprays of leaf and 1:500:400 Bordeaux mixture 500-600 times chlorothalonil were sprayed before and after flowering. When spraying, remember to spray all the young shoots.

4. If the disease is not effective, blackpox disease occurs and it is sprayed with 2000-2500 times plaster. In severe cases, it will be sprayed once every 6 to 7 days.

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