PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST
White grub on groundnut
Holotrichia sp Sinhala- Kambili panuwa, Tamil- Koravanan pulu
- Plough the field repeatedly mainly in May-June to expose grubs to scorching sun radiation and for predation by natural enemies such as birds
- Flood the fields before sowing wherever possible to reduce the grub population. This avoid adult egg laying and kills the grubs in the soil.
- Avoid keeping organic matter/ plant debris in field.
- Add well decomposed organic matter to fields
- Trim off shrubs and trees in and around the field
- Prune adult alternate host plants after first showering, i.e. neem
- Practise timely planting/sowing
- Look for yellowing of leaves, wilting, stunting and dying of plants
- Observe large patches of wilted plants
- Pull out the wilted and yellowing plants and observe the root damage (larvae damage plants by feeding on roots)
- Look for abundance of adult beetles feeding on leaves of the host plants especially at night and adults fallen near the base of surrounded trees.
- Collect and destroy adult beetles by using light traps in peak periods (October-November).
- Collect and destroy the adults fallen near the base of the surrounded trees.
- Keep fresh neem twigs at several places in the field in evenings to collect and destroy beetles.
- Collect and destroy larvae during weeding.
CREATED/UPDATED: May 2016/October 2020
PRODUCED BY: Plantwise
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