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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

White rust on leafy vegetables

Albugo candida Sinhala – Sudu Malakada; Tamil – Ilai marakkarikalil ven thuru noi
Sri Lanka
  • Deep plough the soil and expose to sunlight for two weeks
  • Improve drainage
  • Use disease free planting materials
  • Apply recommended N and K containing fertilizers
  • Do not overuse N fertilizer
  • Look for whitish spots on underside of the leaves
  • Stem enlargement can be seen on the base of the stem
  • Downward curling of tender leaves in the terminal bud
  • Growth retardation
  • Remove and burn infected plants
  • Practise early harvesting
  • 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
  • Do not repeat pesticides with same mode of action
  • WHO Class U – Unlikely to present acute hazard in normal use
  • FRAC – Fungicide resistance Action Committee
  • Chlorothalonil (500 g/L SC). Rate of dilution- 30 ml/10 L of water. Rate of application – 950-1200 ml/ha
  • WHO class U. FRAC M5- Multi site. Apply only after harvesting. Pre harvest interval- 14 days. Toxic to predatory mites, fish and earthworms
  • Mancozeb (80% WP). Rate of dilution- 20 g/10L of water. Rate of application – 650-800 g/ha
  • WHO class U. FRAC M3 – Multi site. Apply only after harvesting. Pre harvest interval- 14 days. Toxic to predatory mites, parasitoids and fish and moderately toxic to flower bugs
AUTHOR(S): K.P. Somachandra, Mahesh Gunasena, M.S.K.K. Perera (Department of Agriculture)

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

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