For high yardlong bean yields, preventing the pod borer is key
The adult pod borer moths lay eggs on the tender leaves of the plants. After 5-7 days, the hatched larvae bore into the pods and feed on the beans. Once larvae past the 3rd instar have bored into the pods, spraying pesticides can hardly kill them. Therefore, to control this pest, fertilizer and water management should be strengthened to ensure uniform growth and a relatively concentrated flowering and pod-setting period, so that in the critical period the pest can be...
The adult pod borer moths lay eggs on the tender leaves of the plants. After 5-7 days, the hatched larvae bore into the pods and feed on the beans. Once larvae past the 3rd instar have bored into the pods, spraying pesticides can hardly kill them. Therefore, to control this pest, fertilizer and water management should be strengthened to ensure uniform growth and a relatively concentrated flowering and pod-setting period, so that the pest can be eliminated in a concentrated way during the critical period.
To control the yardlong bean pod borer, the principle of "focusing on the buds" should be followed, spraying to kill the larvae in the flower buds during the flowering period. The best time to spray is from 8-10 a.m. on a sunny day (when the flower buds open). After the flowers fade and the pods have grown to more than 10 cm long, spray once, which can kill the newly hatched larvae and the young larvae that have bored into the young pods. For the pesticide, you can choose Kung Fu 1500x dilution, or abamectin 1500x dilution, etc.