What kind of pest is cabbage armyworm? Cabbage armyworm harm disease is what how to prevent and cure?

What kind of pest is cabbage armyworm? It occurs for 8 generations in a year. The eggs lay on the tender leaves, and the larvae first feed on the tender stem and leaf epidermis after hatching, and then decay into the fruit after the second and third instar. The larvae have the habit of cannibalizing each other. The body color often changes, which is similar to that of the host. The mature larvae pupate in the soil and overwinter in the pupa stage.

Harm: the adults feed on nectar, the larvae feed on tender stems and leaves or eat into the stems, resulting in plant death, and flower eaters during flowering affect pollination. The main harm is that the first instar larvae decay into young fruits or mature fruits from around the pedicel, resulting in fruit decay without commercial value.

Prevention and control methods:

First, sex pheromone is used to trap and kill adults for a long time and in a large area.

Second, the soil must be irrigated before planting to kill the larvae or pupae in the soil.

Third, the pheromone trap box is hung for a long time to trap and kill a large number of male adults in order to reduce the chance of mating with female adults and reduce the population density. At the same time, it can be used as a monitoring of population changes in the field and as a reference for pesticides. Set up 810 units per hectare, 1m and 1.5 meters above the ground.