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Prevention of tomato virus disease
Tomato virus disease often has 3 types: mosaic type, fern leaf type, stripe type. When the disease occurs, the leaves are mainly curled, and the leaf flesh becomes less and sometimes only the midrib. The stalks are changed from dark green sub-sets of short streaks to deep brown subsidence with oily, necrotic spots; the fruits form a face or rot. The virus disease is mainly transmitted by several ways, such as seed poisoning, soil poisoning, locust transmission, and contact infection. To effectively and economically prevent and treat this disease, it is necessary to prevent disease from being more important than cure and cut off the means of transmission to control the occurrence and development of the disease. 1. Select disease-resistant varieties Israel 189, 516, the United States Dahong, Liaoyuan Duo Li, L402 and other varieties with better disease resistance. 2. Nursery bed soil disinfection with 40% formalin fumigation, 100-150 grams of formalin per 500 kg bed soil water 10-15 kg (equivalent to 1%) sprayed on bed soil, turn Pour the mixture after stirring, cover it with plastic film for 2-3 days, peel it off, and then dry it for 5-6 days. 3. Seed disinfection: soaking seeds with 10% sodium phosphate for 20 minutes, or 0.5% formalin soaking for 30 minutes or 1% potassium permanganate for 20 minutes, then rinsing with warm water and soaking and germination. 4. Thorough prevention and control of aphids to prevent aphid transmission of virus, from the cotyledon stage to the outcome period, pay close attention to the emergence of aphids, found after spraying 800-1000 times liquid dimethoate EC to eliminate. 5. Cultivation measures Prevent disease 1 timely sowing, nurturing strong seedlings. 2 Deep plowing rotation, and prevention of continuous cropping or adjacent planting with solanaceous crops and cucumbers. In addition, the tomato plot should also be kept away from Taoyuan. 3 Strict selection of robust and disease-free transplants and colonization. Wash hands and wash tools with soapy water after touching the infected strain. Smokers pay special attention to washing their hands after smoking to prevent infection. 4 Timely and late snoring and early harvesting to postpone human contact infection and improve plant disease resistance. 5 Strengthen the management of fertilizer and water, increase the application of phosphorus and potash fertilizer at the bottom, avoid water shortage and lack of fertilizer during growth. 6 Remove the diseased strain and find that the diseased plant is cleared immediately and bring it deep outside the field to prevent contact with healthy plants. And pay attention to the situation of neighboring plants. 6. Use 83-enhancer agent to prevent and treat 83-enhanced agent is a new type of plant growth regulator. Before the tomato seedling stage and the result, the original solution is diluted 100 times and sprayed 2-3 times.