Red Hairy Caterpillar
Young caterpillars appear in large numbers during the rainy season and scarp the lower surface of the leaf. Mature caterpillars feed voraciously on all plant parts, including flowers, buds, and leaves. Only hard tissues such as the midrib, the veins and the petioles are left. The grown up red hairy caterpillars move in clusters from field to field, often causing severe defoliation and yield reduction in the whole area. Full grown larvae burrow into the soil to pupate, usually in undisturbed soils.
The adult moth emerges from the soil immediately after the monsoon rain. It has light brown forewings with white streaks over the pane and a yellowish band along the anterior margin. Its hindwings are white with distinct black spotson them. Females lay about 1000 creamy yellow eggs in clusters on the underside of leaves, or on soil debris. The light-brown young larvae are hairless and feed gregariously on leaves. Mature larvae are reddish brown with a black band on their flank and long reddish hairs on the body. They are highly active and destructive. They burrow 10 to 20 cm into the soil under trees, hedges, or shady corners and remain there as pupae for about 10 months before emerging again as adults.
Biocontrol methods include the release of Trichogramma parasitoid wasps. These parasitize on eggs and young larvae of the red hairy caterpillar. Spraying bio-insecticides based on Nuclear Polyhedrosis Virus (NPV) or Bacillus thuringiensis in early stages can effectively manage the pest.
Use an integrated approach with preventive measures and biological treatments to control populations of red hairy caterpillar. If the economic threshold for chemical treatment is reached (eight egg masses per 100m length or 10% leaf damage), dusting of carbaryl or quinalphos might control young larvae. Phosalone, dichlorvos, endosulfan or quinalphos can be used to control full grown insects.