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Scallion dwarf disease
Scallion dwarf disease, also known as yellow dwarf disease, is a symptom of the onion after it has been infected by a virus. In the past few years, onion fields have generally occurred, especially the old vegetable areas and onion production bases. The disease has become increasingly serious. The pathogen of Welsh onion dwarf disease belongs to the virus and it is one of the major diseases occurring in the onion and garlic crops in recent years. Just planted onion seedlings, good growth, if the high temperature and drought in July, there are a few typical atrophy disease in August, the peak incidence from mid-September to mid-October. The new leaves produced at the initial stage of the disease were thin and tender, and the leaf color became lighter. The yellow leaves appeared on the heart leaves. The leaves were uneven and spirally twisted. Some leaves were twisted to one side and the plants shrank. According to field observations, the old vegetable fields were planted with seedlings; the seedlings were planted before the “equinoxâ€; the spring fleas were more in the spring of the following year; the onions were planted in semi-dry colonies; the onion seedlings were thrips and the worms were heavier; the soil drought after colonization was revived; Temperatures are high and rainfall is low. According to the occurrence characteristics of wilting dwarf disease, taking comprehensive cultivation measures can greatly reduce the occurrence of this disease. (1) Choose disease-resistance varieties such as Zhangqiu Indus, Wuyeqi and their first generation hybrids, Luoyang Holly, and Tangshan monologue; (2) Early breeding before the “Equinox†is the “Equinoxes†breeding seedlings in the late evening. "Spring equinox" mulching spring seedlings; (3) seedling stage with 40% dimethoate and 80% dichlorvos mixed solution 1000 times, plus a small amount of detergent or waste soybean milk, to increase the adhesion ability (the same medication), prevention and control of horses and horses Aphids; (4) Replanting onions before planting, raising seedlings, grading with dimethoate 1000 times potion, planting strong seedlings; (4) After planting and reviving, onion trenches covered with wheat bran 250 kg/667 square meters or potato秧 秧 秧 秧 秧 秧 秧, 300 kg / 667 square meters of fresh weeds moisturizing cooling, sparsely soil fertilizer field; The next 20 kg/667 square meters, top dressing and cultivator, earth, watering each other to promote the growth of strong onion seedlings; (7) before spraying onions 2 times, 7-l0 days once, after spraying 3 times naphthylamine amine solution Agent, 1 kg of water added 20 kg to prevent disease and strong trees; (8) If there are still a few diseased plants in the onion field, 0.5% of the resistant factor 1 can be used 300 to 400 times or 25%. No. 1 virus WP 300 times, or 1.5% Zhibingling 400 times, total control, to ensure strong long onion harvest. In addition, the above-mentioned pharmaceuticals were mixed with a 500-fold harvest of No. 1 for better results. (Zhong Guo)