When to plant seeds?

The planting time of spore cabbage should be determined according to the variety and cultivation area. Early-maturing varieties are generally selected for open-field cultivation in Shanghai, and sown in late July and early August, while early and medium-maturing varieties can be selected for protected cultivation, and sown from late July to early September.

Control of diseases and insect pests of spore cabbage

1. Standing blight: it occurs at the seedling stage, and wilting, drying up and dying can be seen within a few days after the plant is infected; the pathogen needs more than 98% relative humidity for germination, so there can be no stagnant water at the seedling stage; 75% chlorothalonil is sprayed after pulling out the diseased plant at the initial stage of the disease.

2, downy mildew: generally in rainy weather, poor ventilation, continuous disease, should do a good job in field management, after the disease with 25% metalaxyl spray.

3. Black rot: it is a bacterial disease, the diseased plant should be pulled out in time at the initial stage of the disease, and 72% agricultural streptomycin sulfate or 60% ethylphosphine aluminum should be used for control. Take turns to use the medicine, once every 10 days, 2-5 times in a row.

4. There are mainly aphids, cabbage insects, diamondback moth, etc., which should be checked and controlled in time, and can be sprayed with Kuailing and imidacloprid. Physical methods such as silver anti-insect net, yellow sticky board and frequency vibrating insecticidal lamp were used to trap and kill aphids, diamondback moth and night moth adults. Biological control can use biological pesticide BT emulsion to control Plutella xylostella and Pieris rapae, release parasitoids or applied traps to kill Plutella xylostella and cabbage armyworm. The use of chemical pesticides should comply with GB4285 and GB8321 regulations. Insecticides such as imidacloprid, Acetamiprid, avermectin, hit, Regent, Jieji, Caixi and other insecticides were used to control aphids, Plutella xylostella, cabbage armyworm and other pests.