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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Blast disease on rice

Magnaporthe grisea (anamorph: Pyricularia oryzea) Amharic: ye ruz mich; Tigrigna: nay ruz michi
Ethiopia
  • Destroy infested rice residues from previous crop
  • When planting, use disease-free seed from a reliable source
  • Use the proper seed rate: broad casting,100kg/ha and transplanting, 50kg/ha
  • Water seeding (sowing into water) to eliminate disease transmission from seed to seedling
  • Plant early to avoid late season blast pressure
  • Practice continuous flooding and avoid long drainage periods as this can stress the plant and make it more susceptible it the disease
  • Avoid high rates or excess use of nitrogen fertiliser as this can increase the plant's susceptibility to the disease
  • Additional relevant crops: barley, finger millet
  • Regularly visit the rice field at least once per week to look for symptoms
  • Leaves: diamond-shaped lesions with a grey/white center and dark green/reddish-brown border, sometimes with a yellow halo
  • Nodes: brown or black colouration can be seen on diseased nodes
  • Panicles: infection can occur on all parts but look for neck rot below the panicle. Bluish-grey fungal growth and sporulation can occur over infected regions
  • When the first symptoms are seen carry out direct control methods
  • Remove any plants showing symptoms of the disease and bury or burn to destroy
  • There are no fungicides registered in Ethiopia at this time for management of rice blast
AUTHOR(S): Kassahun Sedessa (EIAR), Mebrahtom G/kidan (TBoARD), Habtie Abate (S/Gondar Agri Dept, Amhara)

CREATED/UPDATED: October 2015
PRODUCED BY: Plantwise

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