What are the control methods for the bean pod borer?
The bean pod borer, also called the cowpea pod borer, is one of the main pests of beans. The adult cowpea pod borer is dispersed and hidden, flies over a wide range to lay eggs, and lays many eggs, so it is not easy to kill or trap by spraying. Adults lay eggs on the tender leaves of the plant, and after about 5--7 days they hatch and bore into the pods to feed on the beans. Larvae over 3rd instar bore into the pods, and spraying...
The bean pod borer, also called the cowpea pod borer, is one of the main pests of beans. The adult cowpea pod borer is dispersed and hidden, flies over a wide range to lay eggs, and lays many eggs, so it is not easy to kill or trap by spraying. Adults lay eggs on the tender leaves of the plant, and after about 5--7 days they hatch and bore into the pods to feed on the beans. Larvae over 3rd instar bore into the pods, and it is very difficult to kill them by spraying chemicals. Therefore, to control this pest, fertilizer and water management should be strengthened so that seedlings emerge uniformly, growth is neat, and the flowering and pod-setting period is relatively concentrated, so that the pest can be eliminated in a concentrated way during the key period.
Spraying should adhere to the principle of "mainly treating the flower buds," killing the larvae in the flower buds during the flowering period. The best time to spray is at 8--10 a.m. on sunny days when the flower buds open. After the flowers fade and the pods have grown to more than 10 cm long, spraying once can kill newly hatched larvae and young larvae that have bored into the young pods. For the pesticide, choose Kung Fu 1500 times dilution, or abamectin 1500 times dilution spray, or Arruibao (4.5% emulsifiable concentrate) 1000--2000 times dilution; or Anleite (25% emulsifiable concentrate) 1500--2000 times dilution; or Ruining (2.5% emulsifiable concentrate) 2000 times dilution; or Nongsite (40% emulsifiable concentrate) 1500--2000 times dilution; or Sukai (44% emulsifiable concentrate) 2000--3000 times dilution.