Pod Borer

Larvae vary in colour from green to brown or pink, often with faint longitudinal stripes, and can reach three to four centimetres at maturity. A characteristic sign is a round hole bored into the side of a pod, with the larva’s head and part of its body often visible inside while feeding.

Adult moths are medium-sized and night-flying, and are rarely seen in the field; scouting therefore relies mainly on checking flowers, buds, and pods for larvae, entry holes, and frass.

Moths lay eggs singly on leaves, buds, and flowers. Young larvae first feed on flowers and foliage before moving to developing pods, where later instars cause most of the damage by boring in and consuming seeds from within. Several overlapping generations can occur within a single season under warm conditions.

Feeding on flowers and buds reduces pod set, while boring into formed pods destroys developing seeds directly and can allow secondary rots to enter through the wound. A single larva often moves between several pods during development, damaging more than it fully consumes.

Host crops include chickpea, common bean, and pea, along with many other legumes and, for the more polyphagous Helicoverpa armigera, a wide range of unrelated crops.

Regular inspection of flowers and pods from the start of flowering, combined with pheromone traps to track adult moth activity, helps determine when populations are building and whether local thresholds are approached.

Pod borer management focuses on protecting the flowering-to-pod-fill window using a combination of tactics rather than a single approach.

• Scout flowers and pods regularly from early flowering onward
• Conserve parasitoid wasps, predatory bugs, and other natural enemies
• Use resistant or tolerant varieties where available
• Consider trap or intercrop plantings and timely planting to reduce exposure during peak moth activity