1. Powdery Mildew Powdery Mildew is a disease that is widely distributed and seriously affected. Regardless of the greenhouses, greenhouses and open field cultivation of pumpkins have occurred, mostly in the melon period and mature period. Once the disease occurs, it often develops rapidly. If it is not controlled in time, it will lead to yellowing of the melon leaves, which will cause the early growth of the fruit to be slow and the plant premature decline, which will seriously affect the quality and yield of the pumpkin. 1. Symptom identification. The disease mainly infects the leaves, petioles and vines of the squash with less fruit damage. In the early stage of disease, the small round white powdery mildew grows on the front or back of the blade and gradually enlarges into a large white powdery mildew, and then spreads to the petioles and stems until the tender fruit. In severe cases, the leaves of the entire plant were covered with a layer of white mold, and the leaves turned yellow and the texture became brittle. In the later period, scattered or enveloping closed capsule shells appear in the white powder layer, and then become yellowish brown small particles. 2. The law of onset. The disease is caused by a fungal infection, and the pathogenic bacteria can overwinter on sick bodies. Pathogens are transmitted through air currents, rainwater, and agricultural operations. 3. Comprehensive prevention and control technology. At the beginning of the disease, spray with 0.2% baking soda solution. Spray once every 7 to 9 days, each spray 75 kg per acre. At the onset, 20% Triadimefon EC 1500x, 25% Triadimefon 2000 to 3000x, 45% Sulphur Sulfur Suspension 500x, and 20% Optenone Suspension 600x Spray liquid. Spray once every 7 to 9 days, even spray 2 or 3 times, each spray 75 kg per acre. Second, virus disease 1. Symptom identification. The types of virus diseases mainly include mosaic type, wrinkled type, and yellow type, and mainly mosaic type. Mosaic type diseased plants have weak growth and development. Firstly, there are dark and light green leaves and leaf spots on the top leaves of plants. The leaves become smaller and curled, often causing the leaves to scorch, the vines to twist, and the vines to shorten, the plants dwarf, and the fruit damage becomes smaller. Caused premature death of plants, and even no harvest. 2. Incidence conditions. Severe weather occurs when the weather is heavy and the locusts are severe. The occurrence of whiteflies in the greenhouse is heavy and the viral diseases are heavy. There are many weeds in the field and the water supply is insufficient. The plants grow weak and the incidence is heavy. 3. Comprehensive prevention and control technology. Virus disease prevention should adhere to the principle of "prevention first, comprehensive prevention and control". The seeds were dry-hot-disinfected and treated with a dry heat incubator at 40°C for 24 hours and then kept at 5°C to 10°C for 2 to 3 days to reduce the seed poisoning rate. After soaking for 20 minutes with a 10% solution of sodium trisulfate, washing with clean water and then sowing, the virus carried on the surface of the seed can be rendered inactive. Actively control aphids and whitefly, spray seedlings once before colonization, so that seedlings are colonized with drugs. Strengthen cultivation management and remove weeds in the fields at an early stage. The use of formula fertilization technology, appropriate amount of phosphorus and potassium fertilizer. Watering in a timely manner to prevent drought, watering with fertilizer after squashing. Pull out the diseased plant as soon as possible, place it in a plastic woven bag and take it deep outside the shed. After touching the diseased plants, wash the hands with soap and perform agricultural operations. Diseased and healthy plants should be managed separately. In the early stage of disease, it can be sprayed with 20% Virus A WP 500 times or 1.5% Phytopathogenic Emulsion 1000x or 83 Immune 100x etc., sprayed every 10 days, and even sprayed 2~3 Times, each spray 50-60 kg per acre.
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