Weather Conditions In Cotton Producing Areas Are Likely To Cause Diseases And Insect Pests In Cotton In Recent Years.

From 6 to August, cotton The most critical period of growth is also various. Diseases and pests Frequent occurrence of injuries. Although the percentage of insect resistant cotton planting is relatively high in all parts of the world, the insect resistance of cotton has generally declined in the middle and later stages of growth. In addition, with the reduction of insecticidal cotton fields, the cotton farmers still can not ignore the occurrence of pests such as cotton bollworm, cotton aphid and cotton spider mites.

In the past month, most of the cotton in the whole country except Western Xinjiang and Shandong Producing area The average temperature is higher than that of the same period of the same year, and the amount of cotton production areas such as Hebei, Shanxi, Western Hubei, northern Jiangxi, southern Shaanxi and Xinjiang are relatively few. Meteorological conditions can easily lead to the development of pests such as cotton bollworm, cotton aphid and cotton spider mites.

　 Bollworm

Among these pests, the occurrence area of Helicoverpa armigera reached 42 million mu, of which third generation of Helicoverpa armigera occurred in most parts of Shandong, and Xinjiang and Jiangxi took place. Tianjin, Hebei, northern Henan and Northern Hubei occurred moderately.

It is estimated that in the next ten days, the rainfall in Xinjiang, Shaanxi, Hebei and other places with relatively low initial rainfall is still relatively low. At the same time, the rainfall in Shandong, Henan, Jiangsu, Anhui and other producing areas will be less. Development 。 In view of the present cotton diseases and insect pests, we should pay attention to prevention and strengthen prevention and control.

For the prevention and control of cotton bollworm, we must select the timing of medication according to the selected agents. If pesticides are selected as organophosphorus and pyrethroids, they must be used when insects are relatively small. If biological pesticides are selected, it is best to start using drugs when they are found: if there are some large insects, we should choose some organophosphorus pesticides with higher toxicity, such as chloramine phosphorus, acephate, or potassium salt, and so on.