Brown spot disease of zucchini mainly harms leaves. How to prevent summer squash brown spot?

Or fenvalerate emulsifiable concentrate 2000-3000 times, or 50% propargite wettable powder 800- 1000 times and 10% cypermethrin emulsifiable concentrate 2500 times, once every 7- 10 days and continuously for 3-4 times. Where conditions permit, insect-proof nets can also be used for breeding. ? Occurrence regularity: Several viruses such as cucumber mosaic virus can overwinter on perennial weeds and celery and other vegetables. Friction transmission of aphid juice absorption. Melon mosaic virus seeds may be toxic. High temperature and drought, extensive management and lack of fertile land are all serious diseases.

In the adult stage, plants are susceptible to diseases, and the seed setting rate is easy to decrease, and some plants will bear fruit. However, there will be tumors or black spots on the surface of melon, which will seriously affect its appearance and taste, and will also endanger human health. In addition, infected fruits are more likely to fall off when they are immature. When the virus strain was found for the first time, the whole plant was sprayed with 40 grams of plant virus+1 silicone-coated or 240 ml of pure milk 15 kg of water for 2 days, with an interval of 5 days, and then with 1 time. After the disease is completely controlled, it can be prevented by using drugs once every course of treatment.

Diseases that can reduce the spread of exposure to viruses can be spread through plant wounds. Therefore, row spacing should be increased in cultivation, and seedling cultivation should be carried out to minimize the wounds caused by agricultural operations. Farming operation should follow the principle of healthy plants before diseased plants. Don't fork the early zucchini to avoid the wound spreading poison. Tobacco ring spot virus, watermelon mosaic virus, cucumber mosaic virus and melon mosaic virus.

The main pathogens are cucumber mosaic virus and melon mosaic virus. These viruses have many hosts and transmission routes, which will lead to the large-scale occurrence of zucchini virus diseases. When the virus strain was found for the first time, the whole plant was sprayed with 40 grams of plant virus+1 silicone-coated or 240 ml of pure milk 15 kg of water for 2 days, with an interval of 5 days, and then with 1 time. After the disease is completely controlled, it can be prevented by using drugs once every course of treatment.