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Collar Rot on Cowpea

Sclerotium rolfsii (Sinhala: Padastha kunuwima, Tamil: Kaluthu alulkal noi
Sri Lanka
  • Deep ploughing once in 3-4 season
  • Sterilization of soil by exposing to bright sunlight
  • Remove and destroy previous season's infected crop debris
  • Crop rotation with non- leguminous crops
  • Sowing on raised beds to improve drainage
  • Avoid accumulation of leaf litters in the crown area
  • Make regular field visits and look for followings -
  • yellowing of leaves in isolated patches
  • decay of stem base or collar region at ground level and wilting
  • Appearance of white mycelium in collar region which extended into the soil and on organic debris.
  • Numerous tan to brown, spherical sclerotia of about mustard seed size near the collar region
  • Remove affected plants with soil and burn
  • Avoid irrigation through infected to healthy fields
  • Apply fungicide as soil drench to infected area and surrounding healthy plants only
  • Always wear personal protective equipment while handling pesticides
  • Read the manufacturer’s instructions carefully before handling pesticides
  • Do not eat, smoke or drink while spraying pesticides
  • Thiophanate Methyl 70% WP. Application rate - 30g in 50 lit. of water for 10m2
  • WHO Classification – class U. Moderately harmful to predatory mites and flower bugs
AUTHOR(S): Lakmini Priyantha and Mahesh Gunasena, (Department of Agriculture, Sri Lanka)

CREATED/UPDATED: August 2018/October 2020
PRODUCED BY: Plantwise

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