Pea moth

The pea moth (Latin: Cydia nigricana) is a significant pest of peas, belonging to the Tortricidae family of the order Lepidoptera. It is a widespread insect in pea-growing regions, causing substantial financial losses by reducing both yield and the quality of harvested seeds.

While the larvae are highly specialized to feed on pea pods, adult moths are known to visit the flowers of various other plants, including oats, fodder beet, winter rapeseed, cabbage, winter barley, common hop, apple trees, and alfalfa. However, their reproductive cycle is strictly confined to the pea crop.

The species has one generation per year. It overwinters as a mature larva in a silken cocoon within the soil. Pupation takes place in late spring, followed by the emergence of adults, which coincides with the flowering stage of the pea crop. Females lay eggs on leaves, sepals, and pods.

The damage is caused by the larvae, which bore into the developing pods to feed on the seeds. By consuming the inner contents and fouling the pods with silk and excrement, they render the crop unfit for human consumption and reduce its value. Severely infested crops show a high percentage of damaged and stunted seeds.

Effective management strategies combine cultural and chemical control. Key practices include sowing early-maturing varieties to escape peak pest pressure, deep plowing to disturb overwintering sites, and timely application of insecticides based on pheromone trap monitoring. Integrated pest management (IPM) is essential to keep the population below economic threshold levels.