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PEST MANAGEMENT DECISION GUIDE: GREEN LIST

Brown leaf spot on rice

Cochliobolus miyabeanus (Bipolaris oryzae)
  • Pre-soak seeds in cold water for 8 hours, then hot water (53-54°C) for 10-12 minutes before planting.
  • Only transplant seedlings which have no brown spot symptoms.
  • Destroy infected rice crop by burning soon after harvest.
  • Control of weeds during and post-season.
  • Addition of calcium and potassium in soil to boost disease resistance.
  • Avoid irrigation from infected to uninfected plots.
  • Monitor crops weekly during growth season. Observe for small, brown, circular lesions on the leaves, sheaths, glumes and panicles. As lesions age they become oval, light brown, grey centre with a red-brown margin.
  • As soon as symptoms are observed, undertake direct control measures.
  • Remove infected plants and burn.

CREATED/UPDATED: April 2018
PRODUCED BY: Plantwise