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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

White grub on groundnut

Holotrichia sp Sinhala- Kambili panuwa, Tamil- Koravanan pulu
Sri Lanka
  • 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.
  • No chemicals recommended
AUTHOR(S): S. Rajesh Kanna (Department of Agriculture)

CREATED/UPDATED: May 2016/October 2020
PRODUCED BY: Plantwise

©CAB International. Published under a CC-BY-SA 4.0 licence.