The disease of the onion is a symptom of the onion after being infected by the virus. Scallion atrophy seriously affects the quality and yield of green onions, and timely pesticide control is necessary. China Pesticide Network Xiaobian finishing relevant information for your reference:
The pathogen of the onion atrophy is a virus, and it is one of the main diseases that have occurred in onion and garlic crops in recent years. The newly planted onion seedlings grow well. If there is high temperature and drought in July, a few typical atrophic strains appear in August, and the peak incidence is from mid-September to mid-October. The new leaves born in the early stage of the disease are thin, the leaves are light, the pale yellow spots appear on the heart leaves, the leaves are uneven, spirally twisted, and some leaves are twisted to one side, and the plants are atrophied.
According to the field observation: the old vegetable field seedlings are planted repeatedly; the "autumn seedlings" before the seedlings are early, the spring is more fleas; the onion is sun-dried and semi-dried; the onion seedlings are thrips, the aphids are heavier; the soil is arid after replanting; July The temperature is high, and the year when the rain is less is heavier.
In view of the occurrence characteristics of the onion shrinkage disease, comprehensive cultivation measures can greatly reduce the occurrence of this disease.
(1) For the nursery, the disease-resistant varieties such as Zhangqiu Dawutong, Wuyeqi and its first-generation hybrids, Luoyang Holly, and Tangshan Monologue are used;
(2) Early seedlings before the "autumn" are seedlings after the "autumn", and vigorously promote the "spring equinox" mulching film to cover the spring seedlings;
(3) Use 40% of dimethoate and 80% dichlorvos mixture 1000 times in seedling stage, add a small amount of washing powder or waste soy milk, increase the adhesion ability (the same medicine is used), and control the thrips and aphids;
(4) Re-application of base fertilizer before planting onion, grading seedlings, rooting with 1000 times of pedicel, and planting strong seedlings;
(5) After the resurrection of the planting, the onion ditch is covered with 250 kg/667 m2 or potato bran, and the fresh weeds are 300 kg/667 m2 to moisturize and cool the soil;
(6) If there are still a small number of diseased plants in the onion field, use 0.5% anti-pathogenic No. 1 300-400 times or 25% anti-virus No. 1 wettable powder 300 times, or 1.5% of phytopathogenic 400 times. Thorough control to ensure that the green onions grow well. In addition, the above-mentioned medicaments are mixed with a 500-fold liquid of the first harvest, and the effect is better;
(7) Spray 2 times before planting onion, once every 7-l0 days, spray 3 times of naphthaleneacetic acid amine solution after planting, and add 20 kg of water to prevent disease and strong trees;
(8) According to the pesticide network , from August to October, the special compound fertilizer for the onion is applied once for 50 kg/667 square meters, and the urea is applied twice for 20 kg/667 square meters each time. Topdressing and cultivating and soil cultivation Watering and mutual cooperation, promote the growth of onion and strong seedlings.
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