Cotton aphid is one of the important pests that damage cotton. The cockroaches and nymphs gather on the back of the leaves to suck the juice, destroy the cell tissue, cause the leaves to shrink and deform, causing the leaves or yellowing to fall off, and the dead are dead. Cotton buds are endangered by volts, which can cause a large number of buds to fall off, which seriously affects the yield of cotton.
The cotton aphid has a complicated life history. It can occur in Hebei Province for more than 20 generations. It can be propagated in cotton fields for 10 to 20 generations. From mid-May to mid-June, it is the peak period of nursery damage, from mid-July to mid-August. Fuxi is the peak period. The climatic conditions have a certain impact on the growth and decline of cotton aphid. The low temperature in winter and the high temperature and high humidity in summer are not good for the propagation of cotton aphid. Light rain and cooling before entering the volts are important conditions for the outbreak of Fuxi. Heavy rain and heavy rain are not conducive to the migration of winged carp, which can reduce the number of nurseries. The natural enemies of cotton aphid mainly include ladybugs, grasshoppers, spiders, parasitic wasps, and insectivores. These natural enemies play an important role in controlling the population density of cotton aphid. Therefore, the protection and utilization of natural enemies is the control of cotton aphid. The ideal measures, especially for controlling the effects of volts, are most obvious.
It is very important to make a good prediction of the pest situation and master the prevention and treatment standards. At the seedling stage of cotton, a representative cotton field was selected, and a 5-point sampling method was used for investigation. The rate of sorghum strains was 30%, the number of sorghum plants was 500-1000, and the rate of cotton seedlings was 5% to 10%. Time is the best time to prevent and control. During the summer heat and the summer heat, pay attention to the investigation of cotton aphid on the middle and lower cotton leaves of the cotton plant, and investigate 50 strains, take the upper, middle and lower leaves, when the number of the three leaves of the three leaves is 10,000 or one hundred leaves. When the number of sputum reaches 2000, it should be prevented immediately.
In the prevention and control, in addition to taking pesticide seed dressing (such as 5% of the alfalfa granules seed dressing, the amount of 1 to 1.5 kg per mu, the control effect can last for more than 40 days, no killing effect on natural enemies), but also in accordance with Control indicators for field pesticide control. For the plots where the locust spots occur, the method of spotting the spray should be used to avoid the killing of natural enemies. In the case of a large area of ​​locusts, it is necessary to use spray agents that are less lethal to natural enemies (such as smog, imidacloprid, etc.) for spray control.
The cotton aphid has a complicated life history. It can occur in Hebei Province for more than 20 generations. It can be propagated in cotton fields for 10 to 20 generations. From mid-May to mid-June, it is the peak period of nursery damage, from mid-July to mid-August. Fuxi is the peak period. The climatic conditions have a certain impact on the growth and decline of cotton aphid. The low temperature in winter and the high temperature and high humidity in summer are not good for the propagation of cotton aphid. Light rain and cooling before entering the volts are important conditions for the outbreak of Fuxi. Heavy rain and heavy rain are not conducive to the migration of winged carp, which can reduce the number of nurseries. The natural enemies of cotton aphid mainly include ladybugs, grasshoppers, spiders, parasitic wasps, and insectivores. These natural enemies play an important role in controlling the population density of cotton aphid. Therefore, the protection and utilization of natural enemies is the control of cotton aphid. The ideal measures, especially for controlling the effects of volts, are most obvious.
It is very important to make a good prediction of the pest situation and master the prevention and treatment standards. At the seedling stage of cotton, a representative cotton field was selected, and a 5-point sampling method was used for investigation. The rate of sorghum strains was 30%, the number of sorghum plants was 500-1000, and the rate of cotton seedlings was 5% to 10%. Time is the best time to prevent and control. During the summer heat and the summer heat, pay attention to the investigation of cotton aphid on the middle and lower cotton leaves of the cotton plant, and investigate 50 strains, take the upper, middle and lower leaves, when the number of the three leaves of the three leaves is 10,000 or one hundred leaves. When the number of sputum reaches 2000, it should be prevented immediately.
In the prevention and control, in addition to taking pesticide seed dressing (such as 5% of the alfalfa granules seed dressing, the amount of 1 to 1.5 kg per mu, the control effect can last for more than 40 days, no killing effect on natural enemies), but also in accordance with Control indicators for field pesticide control. For the plots where the locust spots occur, the method of spotting the spray should be used to avoid the killing of natural enemies. In the case of a large area of ​​locusts, it is necessary to use spray agents that are less lethal to natural enemies (such as smog, imidacloprid, etc.) for spray control.
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