Locusts, also known as insects and honey insects, are one of the major pests on cotton in China. Cotton aphids damaged in the cotton fields are divided into seedlings and Fuxi. Miao Miao occurred before emergence to budding, suitable for low temperatures, when the temperature exceeds 27 ° C reproduction is inhibited, the population rapidly decline; from early July to mid-August, the common occurrence of aphids called "Fuxi." The average daily temperature of 3 to 24°C and the relative humidity of 55% to 85% are favorable for the proliferation of "Fuxiâ€; when the weather is fine, the rain weather is most suitable for the “Fuxi†breeding; if it is persistently rainy for 5 to 6 days, it is significant. Inhibition.
In general, single cotton fields occur early and heavy, while interplanting cotton fields occurs later. The nutritional conditions of cotton plants have an impact on the occurrence of aphids. Cotton plants with high nitrogen content have serious damage to aphids. In addition, natural enemies of cotton aphids can effectively control their damage. When the total number of enemies and the number of pupae is 1:40, they can basically be controlled. The prevention and control of cotton aphids is mainly based on agricultural control and biological control, supplemented by chemical control.
1. Agricultural control
(1) Intercropping can increase the types and number of natural enemies and control the locust infestation. Such as cotton and wheat intercropping; cotton and mung bean, green manure intercropping; planting corn, rape, sorghum and other lure crops. (2) The rotation of paddy crops can reduce the occurrence of cotton aphid. Where conditions permit, cotton and rice rotations are implemented. (3) Deal with wintering hosts to reduce the source of early spring. Generally before and after the emergence of cotton seedlings, weeds inside and outside the cotton fields are removed.
2. Chemical control
(1) Cotton seed with anti-caries coating is coated with anti-mite seed coating agent, which can effectively control seedling mites, and has a protective effect on the natural enemies of aphids - ladybugs. If the drug is applied at seedling stage, it is imidacloprid or acetamiprid. Both of them have a killing effect on their natural enemies, and they advocate that cotton farmers adopt anti-cotton cotton varieties, which can save labor and control pests. (2) Alternately use the pesticide 3% imipromic emulsifiable concentrate, 10% imidacloprid wettable powder and 2.5% of pyrimidine net (Xinqiu seed special) emulsifiable concentrate diluted 1500-2000 times, which can delay the development of aphid resistance.
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