Soybean meal is a recurrent pest on cowpeas in summer and autumn. Due to the hazards of larvae, the commonly used agents such as trichlorfon and chlorpyrifos are less effective. In recent years, the Rugao Plant Protection Station has studied the hazard characteristics and control techniques of bean larvae in cowpea fields, and put forward effective measures to improve control efficiency. 2006-2007, such as the demonstration of the application of the technology in vegetable gardens in towns and other places, the damage rate of cowpea pods was controlled within 10%, and the locust protection effect was over 85%.
The newly hatched larvae of pods mainly feed on flower buds. After they develop to the second instar, they break the corolla at night and spit silk through the outside of the flowers to pull the receptacles, scallops, and fruit branches of the victim's flower together. During the high temperature, the cowpea flower was open in the morning and closed around 10 o'clock. The normal new closed flower corolla was usually dropped at night that day, during which most of the 1-2 instar larvae were dropped with the corolla, and a small part of the 1-2 instar larvae were Dyloplopodium flowers, corollas that do not escape from the top of the tender pods, and flowers that are implicated in the filaments continue to jeopardize them. When the flowers are not suitable for feeding, they are transferred to nearby pods or other flower organs for feeding. If the larvae in newly closed flowers have reached 3-5 years of age, they will cause serious damage to the flowers, which will seriously affect the growth of the flowers and cause the flowers to be detached from the branches. However, they are implicated by the filaments, and the flowers are suspended on the fruit branches and the larvae. Continue to feed on it.
According to the damage characteristics of pod larvae, buds should be taken as the main object of protection in the production, and the prevention and control strategies for “preventing flowers and protecting the locusts†should be adopted, including the artificial excision of rot and the control of flowering agents. (1) Artificially remove insects. On the premise of not affecting the yield, the silkworms that had been caught on the silk from the fruit branches and the corolla that had left the receptacle but still adhered to the top of the tender pod were removed every afternoon. (2) Control of flowering chemicals. The use of strong penetrant, killing eggs and insecticides with good effects, such as 1.8% avermectin, 35% octyl pyrophosphate, Anda, etc., sprayed in the morning when the flowers open. Rain should be sprayed within 6 hours after the drug falls. From the beginning of the flowering period every 6-7 days, until the flowering period is basically over.
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