In recent years, due to the continuous cropping of eggplants in greenhouses, verticillium wilt disease has been increasing year by year, and mild disease fields have reduced production by about 20%, and severely reduced production by 40% to 50%. Farmers should pay attention and do a good job in prevention and control.
First, the symptoms of disease
Verticillium wilt also known as half crazy, withered wilt disease. The main damage leaves, in the eggplant can be the growth of each growth period, the incidence of the most severe results. In the early stage of disease, pale yellow spots are produced between the lower leaves and veins, and gradually develop to the half of the leaves or the whole leaves turn yellow. The diseased leaves in the early days withered during the day and the night and rainy weather could be restored. The color changed from yellow to brown, and the leaf margin curled upwards. Finally, the leaves were dead and shedding. Diseases can be expanded upwards, which can lead to the onset of the whole plant, with a large number of leaves falling off, and sometimes on the half leaves or half of the plants. The diseased plants were dwarf, with small and small fruits, brown stripes inside, and brown vascular bundles.
Second, prevention and control technology
To adhere to the selection of disease-resistant varieties as the basis, to strengthen the cultivation and management as the center, with comprehensive prevention and control measures to ensure the prevention and treatment of drugs, can effectively control Verticillium wilt disease.
1. The rotation is down. It is recommended that the diseased fields should be rotated for 3 to 4 years with cruciferous vegetables or rice, corn and other grass crops.
2. Use resistant varieties. Wherever the leaves are oblong or pointed, there are nicks in the leaf margins, and more leafy hairs, and the dark green or purple leaf color is more resistant to disease.
3. Grafting seedlings. The use of Torrubam and Wild Chigandra as rootstocks can greatly increase the resistance to Verticillium wilt.
4. Chemical control. When planting, mu 50% carbendazim WP 500 g mixed fine soil 20 kg made of medicinal soil, scattered in the planting hole, for prevention and treatment.
After colonization, the roots and ground can be sprayed 600 times with 70% dexamethasone WP 500 times or 70% thiophanate WP, or with irrigated roots. It is applied once every 10 to 15 days.
50% carbendazim WP can be used 500 times in the early stage of the disease, spraying once every 10 to 15 days, and spraying twice; 70% thiophanate-methyl 500 times or 95% hymexazide wettable powder can also be used. 3000 times liquid irrigation root treatment, 250 ml per plant, every 7 to 10 days irrigation 1 time, continuous irrigation 2 to 3 times. Irrigating the root can only inject the diseased strain and its surrounding strains, and it is not necessary to flood all fields.
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