Nature of damage

After hatching, the young larvae of Maruca vitrata (1st, 2nd and 3rd instars) especially injure the terminal shoots and the flower buds whereas the older larvae (4th and 5th larval instars) particularly damage the open flowers and the pods. The larvae feed from inside a webbed mass of leaves, flowers, flower buds and pods. This concealed feeding habit protects the larvae from natural enemies and insecticides. Older larvae are highly mobile, feeding continuously on flowers and newly formed pods and causing severe damage throughout the reproductive cycle of the crop. Larvae move from one flower to another, and each may consume 4 - 6 flowers before larval development is completed.

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