Control method of eggplant red star disease with chlorotic brown leaves and small spots

Eggplant brown spot, mainly harmful leaves, the initial chlorosis pale to gray-brown spots, and then expanded to 3-8 mm in diameter, the center dark brown to reddish brown, edge brown round spots, which are clustered with small black spots.

1. Characteristics of pathogens:

Conidium, born on the leaf surface of eggplant, black oblate, buried, 70-150 μ m in diameter, 15-23 μ m in diameter; colorless multicellular, linear or cylindrical, curved, 13-18 × 1-1.5 μ m in size.

Red spot disease of eggplant

Second, the conditions of the disease:

The pathogen overwintered with the remains of eggplant disease in the soil with mycelium and conidia. The conidia were produced in the next spring and spread by wind and rain, resulting in primary infection and re-infection. The disease is serious in years or areas where it is warm and humid and even rainy.

III. Prevention and control methods

(1) rotation has been carried out for more than 2 to 3 years.

(2) select early-maturing varieties. Such as Jinan 94mi 1 morning long eggplant, Jifeng 3 big long eggplant, purple long eggplant 8591 and so on.

(3) collecting seeds from disease-free eggplant. Before sowing, eggplant seeds were soaked in 55 ℃ warm water for 15 minutes, or 52 ℃ warm water for 30 minutes, then cooled in cold water, dried and sown, or 1 part each with 50% carbendazim wettable powder and 50% thiram powder, 3 parts of mud powder, mixed with 0.1% seed weight.

(4) the seedbed is disinfected and the soil of the seedbed needs to be changed every year; when sowing, 10 grams of 50% carbendazim wettable powder per square meter or 8 grams of 50% thiram powder mixed with 2kg fine soil are used to make medicinal soil, take 1 scarp 3 to sprinkle on the border surface, then sow, and after sowing, cover the rest of the medicinal soil on the seed eggplant, that is, the upper and lower cushions, and the seeds are sandwiched in the medicinal soil.

(5) strengthen cultivation management and cultivate strong seedlings. Apply sufficient basal fertilizer to promote early growth and early development, and advance the harvest time of eggplant before the epidemic season of the disease.

(6) Pesticide control. After the result of eggplant, start spraying 75% chlorothalonil wettable powder 600 times liquid, 40% nail cream copper wettable powder 600 times liquid, 58% metalaxyl? Manganese zinc wettable powder 500x liquid, 64% poison alum wettable powder 500x liquid, 70% ethyl phosphine manganese zinc wettable powder 500x liquid, 50% carbendazim wettable powder 1000 times liquid, 1ju 1purl 200x Bordeaux solution, depending on the weather and illness, about once every 10 days, continuous prevention and treatment for 3 times. Stop using chlorothalonil and other fungicides 7 days before harvest and 3 days before harvest.