The brown spot of eggplant is mainly harmful to the leaves. The pathogens remain in the soil in the form of mycelium and conidia, and the winters will occur in the soil. When the spring conditions are suitable, the conidia will be produced in the spring, spread by wind and rain, causing initial infection and re-invasion. dye. Therefore, prevention and treatment of this disease must be carried out in advance, the steps have the following aspects:
Agricultural measures
It is carried out for 2 to 3 years. Early-maturing varieties and early-maturing varieties can be used to avoid the disease-prone period. The commonly used early-maturing varieties include Jinan 94-1 Zaolongjiao, Jinyuan Zaojin No.1, Jifeng No.3 Dachangru, and Zichangjiao 8591. Cultivate strong seedlings, apply enough base fertilizer, promote early and long-term development, and advance the harvesting period of eggplant before the disease epidemic season. Seeds are collected from disease-free eggplants.
2. Seed disinfection
Seeds were sterilized before sowing, soaked in warm water at 55 ° C for 15 minutes, or immersed in warm water at 52 ° C for 30 minutes, then placed in cold water to cool, dried and sown. Or use 50% benomyl WP and 1% each of 50% thiram powder, mix 3 parts of fine soil, and mix the mixture with 0.3% of the seed weight. Or use pesticide bactericide 30% carbendazim or 30% methyl carbaryl 1000 times liquid soaking treatment.
3. Seedbed disinfection
The seedbed needs to be replaced with new soil every year. When planting, use 50% carbendazim WP 10g per square meter, or 50% pentachloro-Fumei double powder 8-10g mixed fine soil 2kg to make the soil, take three One of the parts is sprinkled on the noodles, and then sowed. After sowing, the rest of the soil is covered on the seeds, that is, the "bottom cover", so that the seeds are sandwiched in the middle of the soil, and the effect is very good.
4. Chemical control
After the result, start spraying 75% Dako Ning WP 600 times solution, or 40% nail cream copper WP 600-700 times solution, or metalaxyl · manganese zinc wettable powder 500 times solution, or 1% anti-mildew 1000 times solution, or 70% ethyl phosphorus·manganese zinc wettable powder 500 times solution, or 50% benomyl WP 1000 times solution, or 27% copper high suspension agent 600 times solution, spray every 7 days 1 Second, even spray 2 to 3 times.
At the beginning of the onset of brown spot disease, the leaves are chlorotic, producing pale to taupe spots, which then expand into a diameter of 3 to 8 mm. The center is dark brown to reddish brown, and the edges are brown, and many small black spots are formed on the surface. Conidia.
Everyone can observe the growth of eggplant according to this disease. Once the disease is found, it should be prevented in time.
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