Integrated Control of Diseases and insect pests in the "third stage" of Chinese Cabbage

In the process of planting Chinese cabbage, there are many diseases and insect pests in seedling stage, rosette stage and pericarp stage, and the main diseases are anthracnose, downy mildew, bacterial angular spot, soft rot, spot disease and so on. Insect pests are mainly aphids, jumping beetles and cabbage insects. Comprehensive prevention and control methods should be adopted, with emphasis on doing a good job of prevention, strengthening fertilizer and water management, cultivating strong plants and improving plant resistance; opening drainage ditches around to reduce the groundwater level so as not to induce a variety of diseases; and timely ploughing and weeding, pulling out diseased plants and destroying them. On this basis, different prevention and control measures are adopted in different periods.

At seedling stage, aphids can be sprayed with 2000-2500 times liquid of 50% anti-aphid spray wettable powder or 20% aphid kexing 1000 times liquid to control other pests; fields with serious anthracnose in cabbage should be sprayed with 50% anthrax Fumei wettable powder in time; cabbage virus disease can be sprayed with 2500 times liquid spray of 20% virus A wettable powder.

The middle and late September of rosette stage is often the first peak period of downy mildew. It is necessary to strengthen weeding by ploughing, control water and squat seedlings properly to improve plant resistance. Downy mildew can be controlled by spraying 40% ethanophosphate aluminum wettable powder or 64% alum wettable powder or 75% chlorothalonil wettable powder. Black spot can be sprayed with 1000 times solution of 50% prohydantoin wettable powder to prevent bacterial angular spot and black rot.

After the Chinese cabbage enters the heart stage, it is necessary to strengthen fertilizer and water management, timely drainage and irrigation to ensure that the soil has enough water to prevent the soil surface from drying and cracking, so as to avoid root damage. Remove stagnant water in the field in time after rain so as not to induce a variety of diseases. Topdressing in time and applying compound fertilizer 8-10 kg per mu to promote the growth of Chinese cabbage and improve its resistance. In the later stage, we should stop topdressing so as not to overgrow Chinese cabbage. According to the main kinds of diseases and insect pests, the insecticides were selected with reference to the corresponding control methods to seize the favorable opportunity for prevention and control of Chinese cabbage before sealing ridges. The use of Chinese cabbage should be stopped half a month before harvest.