China is a big cotton producer. As we all know, we can't live without cotton, which is mainly used to make all kinds of clothes and many household items. However, there will be many diseases in the process of cotton growth, so diseases will affect the quality and yield of cotton. Xiao Wang brought you common cotton diseases and insect pests and their control methods.

1. Cotton Fusarium wilt

Cotton Fusarium wilt is a common and serious disease of cotton, which is harmful to cotton production and causes great losses. Cotton Fusarium wilt mainly affects cotton seedlings, and the incidence forms are various. Some leaves have a yellow network. After the leaves wither, some leaves will turn yellow or purple, but the result is that the leaves wither and the plants die.

Control method: Fusarium oxysporum can safely overwinter in soil and fertilizer. With the continuous spread of new plants in the second year, seeds, soil and fertilizers should be disinfected before planting ... rational close planting and fertilization, and polymyxin drugs can be used to dilute roots or spray at the early stage of the disease.

2. Verticillium wilt of cotton

There is only one word difference between cotton verticillium wilt and Fusarium wilt. It can be concluded from the name that when cotton verticillium wilt occurs, the leaves lose water and turn yellow and blocked. With the spread of the disease, the condition gradually expanded. After a long period of drought and heavy rain, the leaves suddenly withered and then fell off.

Control methods: Selecting varieties with strong disease resistance and avoiding continuous cropping and good stubble can reduce the occurrence of diseases. Spraying Suan 'an and other growth regulators in bud stage and spraying daidzein manganese zinc or methyl mercaptan regularly have preventive effects.

3. Cotton aphid

Cotton aphid mainly harms cotton seedlings. Aphids suck the sap of seedling leaves, which makes them curl, leading to normal growth and development, affecting the flowering and bolling period, and causing late maturity and yield reduction.

Prevention and control methods: use pesticides that are less harmful to plants for spray killing.

4, cotton bollworm

Helicoverpa armigera mainly affects the bud and boll stage of cotton. The bollworm feeds on cotton buds, bolls and young stems, which leads to flowering failure, boll leaf shedding and boll rot, and finally affects the quality and yield of cotton.

Control method: spray the same pesticide which is less harmful to plants.