Eggplant disease mainly damages the leaves. At the beginning, the green and pale green to grayish-brown spots appeared, and then expanded into dark brown to reddish brown with a diameter of 3 to 8 mm at the center, and brownish spots on the edges. There were many small black spots on the clusters, which were the pathogenic conidiospore.
First, the symptoms of damage
Eggplant disease mainly damages the leaves. At the beginning, the green and pale green to grayish-brown spots appeared, and then expanded into dark brown to reddish brown with a diameter of 3 to 8 mm at the center, and brownish spots on the edges. There were many small black spots on the clusters, which were the pathogenic conidiospore. The black spots were arranged in a roulette pattern with brownish brown on the back, and later lesions merged into irregularly shaped large spots that easily ruptured the perforation.
Second, the pathogenic characteristics
Conidia planted on foliar, black flat spherical, buried, diameter 70 ~ 150 microns, orifice diameter 15 ~ 23 microns; conidia colorless multicellular, linear or cylindrical, curved, size 13 ~ 181 to 1.5 microns.
Third, the incidence conditions
The mycelia and conidia remain in the soil as pathogenic organisms to survive in the soil, and the conditions in late spring are suitable for conidia, which spreads through wind and rain, causing primary infection and reinfestation. It is warm and humid, and it is easy to get sick in years or regions where there is more rainy weather.
Fourth, control methods
(1) Two or more years or more of rotation. (2) Use early maturing varieties. For example, Jinan 94-1 early eggplant, Jifeng 3 large long eggplant, purple long eggplant 8591 and so on. (3) Seed production from disease-free eggplant. Before sowing, the seeds were soaked in warm water of 55°C for 15 minutes, or soaked in warm water of 52°C for 30 minutes, and then put in cold water to cool, dry after sowing; or use 50% benomyl wettable powder and 50% thiram powder each After mixing 3 parts of mud powder, the seed weight is 0.1%. (4) Seedbed disinfection, seedbeds need to be replaced with new soil every year; when sowing, 50% carbendazim WP 10g/m2, or 50% thiram 8 ~ 10g mixed soil 2kg made of medicinal soil, Take 1/3 and sprinkle it on the ravioli, then sow, and after sowing, cover the rest of the medicine with the top of the seed, that is, overlying the lower pad, so that the seeds will be caught in the middle of the mortar. (5) Strengthen cultivation management and cultivate strong seedlings. Applying basic fertilizers to promote early and early-onset hair growth can effectively prevent and cure the eggplant harvesting period before the epidemic season. (6) Chemical control. After the results began spraying 75% chlorothalonil WP 600 times, 40% methemosweet copper wettable powder 600 ~ 700 times, 58% metalaxyl? Manganese zinc wettable powder 500 times, 64% antivirus WP 500 times, 70% phosphine? Manganese zinc wettable powder 500 times, 50% benomyl WP 1000 times, 1:1:200 times Bordeaux mixture, depending on the weather and the disease every 10 days 1 time, continuous control of 2 or 3 times. Chlorothalonil was stopped 7 days before harvest and other fungicides were stopped 3 days before harvest.
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