Occurrence regularity of pea weevil: pea weevil occurs every year 1 generation, and overwinters as an adult in the gaps of warehouses, corners, roofs, packaging, beans, stones outside warehouses, bark near houses and sundries. Eggs are scattered on the surface of young pods, and there are often two or three eggs on the pods, but most of them are single-layer eggs, and only one egg can hatch larvae and drill into the pods. Each pod can spawn more than 10, the average spawning amount is 150, and the egg period is 5-7 days. After hatching, the larvae drill into the pods from under the eggshells and then into the beans to eat.

Only one larva in each bean can develop and survive. When peas are ripe, the larvae are brought into the barn before they are ripe, and continue to feed and develop with the harvest of peas. After ripening, the pupation period is 6 ~ 14 days. Before pupating, bite a round feathering hole on the bean, and leave the seed coat at the hole. After eclosion, the adults fly out of the eclosion hole with a little vigilance, looking for a place suitable for wintering and summering. Adults feign death and have strong flying ability. The optimum temperature for adult development is 27 ~ 28℃, and the development stops at 10 ~ 12℃. Although adults feed on the stems, leaves and flowers of peas, they can only mature and lay eggs after mainly feeding on pollen.