Prevention and treatment of spinach anthracnose in greenhouse with long gray-brown spots on leaves and stalks

At present, it is the peak growing season of spinach in the greenhouse, and it is also the period of high incidence of spinach anthracnose. The disease occurs rapidly and spreads rapidly, affecting the yield and quality of spinach. In order to reduce the harm of anthrax, early detection and early treatment should be achieved to avoid losses in spinach production.

Anthracnose of spinach

1. Characteristics of symptoms:

Spinach anthracnose harms leaves and stalks. Small yellowish spots are born on the leaves and gradually expand into round or oval grayish brown spots with small black spots in the center. When the disease is serious, the diseased leaves turn yellow and wither earlier.

Second, the law of the disease.

Spinach anthracnose is a fungal disease. The spores are transmitted by wind and rain. When the spores germinate, germ tubes invade from the wound or penetrate the epidermis. After a few days incubation period, conidia disks and conidia are produced for re-infection. Low-lying terrain, high planting density, moist air and little rain are all conducive to the occurrence of spinach anthracnose.

3. Prevention and control methods:

1. Disease resistant varieties were selected. Spinach 9, spinach 10, etc.

two。 Soak the seeds in warm soup. Before sowing, the spinach seeds were soaked in 52 ℃ warm water for 20 minutes, stirred continuously, and then moved into cold water to cool, dry and sow.

3. Agricultural measures. Spinach and other vegetables have been rotated for more than 3 years. Reasonable close planting to improve the ventilation and light transmission conditions of spinach room. Release the air in time to reduce the humidity in the shed. When watering, small water should be watered frequently to prevent flooding. When applying fertilizer, we should pay attention to the reasonable proportion of nitrogen, phosphorus and potassium, and excessive application of nitrogen fertilizer is strictly prohibited. After the spinach is harvested, clean the countryside in time, take the diseased body out of the shed, burn it or bury it deeply.

4. Chemical control. In the early stage of the disease, spray 50% carbendazim wettable powder 700 times or 80% anthrax Fumei wettable powder 800 times or 50% methyl topiramate wettable powder 500 times or 25% carbendazim wettable powder 500 times or 30% green leaf Dan wettable powder 600 times, once every 7 days for 2 times, the effect is better. The above pesticides are used alternately to avoid drug resistance in spinach.