Control measures of diseases and insect pests in Chinese cabbage

In the process of the growth of Chinese cabbage, some diseases and insect pests are easy to occur, which have a great impact on the yield and quality of Chinese cabbage, and bring huge economic losses to farmers. So what are the common diseases and insect pests of Chinese cabbage? How to prevent and cure it? Let's get to know each other with the editor.

1. Virus disease

Chinese cabbage heart virus disease mainly occurs in the seedling stage, due to different varieties and sources of disease, so there will be two symptoms after infection, one is deformed mosaic type, the other is necrotic spot type, less pods, low seed setting rate and low germination rate.

Prevention and control measures: for the prevention and control of virus diseases, comprehensive control measures should be taken to give priority to prevention, and varieties with strong disease resistance should be selected. generally, early-maturing varieties have stronger disease resistance than late-maturing varieties. Before sowing, residual plants and weeds should be cleared, continuous cropping should be avoided, diseased plants should be burned or buried deeply in time, fungicides should be sprayed regularly, phosphorus and potassium fertilizer should be added, healthy plants should be cultivated, aphids should be controlled and the route of transmission should be cut off.

2. Downy mildew

Downy mildew mainly harms the leaves of Brassica campestris. The symptoms are irregular spots, grayish green, and downy mildew layer in the later stage.

Prevention and control measures: we should also learn the varieties with strong disease resistance, do a good job in clearing the fields, eliminate germs, and remove diseased leaves in time to prevent the spread of germs. At the initial stage of the disease, 75% chlorothalonil wettable powder was sprayed 600-800 times, once every 10 days, 2-3 times in a row.

3. Black spot

Black spot mainly harms leaves, petioles and pedicels. The leaves are infected with nearly round chlorotic spots, and the edges are light green to dark brown after expansion. In severe cases, multiple disease spots converge into Taipan, resulting in the death of the whole leaf. Finally, the leaves of the whole plant withered outward and inward.

Prevention and control measures: seeds can be soaked in warm water or treated with medicament, the disease is sprayed with chlorothalonil, mancozeb, carbendazim, etc., generally controlled once in 15-20 days, among which dimethrin is prevented and treated for 1-3 times according to the disease.

4. Cabbage worm

The main pests are cabbage insects, which tend to eat up the leaves and leave only veins when they are serious. Generally, cabbage insects are easy to appear when harvesting from middle seedlings to large seedlings, which will have a great impact on the yield if the control is not in time.

Prevention and control measures: spray BT powder 1200-2000 times liquid at the seedling stage, 20-25 grams per mu, after fertilization and watering, be sure to apply medicine, but pay attention to the prohibition of medication in the first half of the harvest, so as not to cause drug residues.

The above is the introduction of pest control measures of Chinese cabbage, hope to help you, want to know more related knowledge, please pay attention to us.