In recent years, blackpox has become the focus and difficulty of grape pest control. Especially in June and July, with the arrival of hot and rainy weather, the disease is more prone to occur. If it is not timely and effectively controlled, it will cause serious damage to grape production. The key to combating grape black spot disease is to make good use of time.
The first opportunity for prevention and control is that southern China should seize from late March to late April; North China should generally catch late May; East China must catch the middle and early April. The incidence of blackpox varies from region to region. At different time periods in the above areas, the grape is beginning to sprout and spread leaves. The temperature conditions have reached the scope of pathogenic activity and the disease has begun to appear. Therefore, the fresh green tissue should be grasped and injected in advance.
The second time for prevention and control is to seize the key prevention measures in June and July. Since June and July began to enter the flood season, the temperature rises quickly. There is often rainfall, high humidity, and high temperature. The plant's green tissue is easy to grow. The region is at the peak of black bean disease during this period of time. Therefore, in June and July, black bean disease must be controlled to prevent and control early deciduous and rotten fruit.
Prevention and control of black bean disease not only attaches importance to chemical control, but also to scientific fertilization and daily field management. The specific approach is:
Field management usually does a good job of field sanitation and minimizes the source of bacteria. Especially reasonable fertilizer management. Before planting the vineyard and harvesting it every year, it is necessary to ditch and apply high-quality organic fertilizers to maintain a strong tree vigor; top-fertilizers containing nitrogen, phosphorus, potassium, and trace elements should be used to avoid separate and excessive nitrogen fertilizer application. . In the meantime, we should do a good job of draining after the rain to prevent the accumulation of water in the orchard.
Chemical control can use 800 times mancozeb or thiophanate-methyl 1000-fold solution. From the end of April to early June, spray 1-2 times before and after the flowering of the grape; also use 25% sesame suspension 800-1250 times agent, 40% fluorosiliconazole emulsion 8000-10000 times, spray once every 10 days, continuous spraying 2-6 times, timely spray to meet the rain.
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