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False smut of Rice

 


False Smut : Ustilaginoidea virens (Cke.) Takahashi

(Deuteromycotina: Moniliales: Dematiacea)

Kannada Name: Kadige Roga

False smut is a fungal disease and is more severe in the years of high rainfall. The farmers consider its incidence as an omen of Good Harvest.

Period of occurrence : Panicle emergence

Extent of yield loss : Negligible, Udupi district 23% and DWR 3%

  • 1000 grain weight by 48%
  • Chaffyness by 40%
  • Seedling growth
  • Seed germination by 25%

Paddy: False Smut

 

Conditions favorable for the pathogen:

  • Low temperature (20°C)
  • High relative humidity (>92%)
  • Moderate rainfall with intermittent clear and drizzling weather during flowering.
  • More prevalent in seasons favorable for good growth and high yields

Host plants: Grasses and Wild rice

Symptoms:

  • Visible only after panicle emergence at milk stage
  • Individual grains of the panicle are transformed into yellow or greenish velvety spore balls
  • Usually a few grains in a panicle are infected..
  • Visible in between glumes.
  • 1 cm and above diameter.
  • Smooth yellow colored membrane which bursts at later stage

Sources of inoculum  : Many grasses and Wild rice

Mode of transmission: Air

Control measures :

Preventive measures:

  • Resistant genotype - Kavya, IR -64, IR- 30864

Chemical control

Spray Chlorothalonil 75 WP , (Kavach ® ) @  2 ml per 1 of water during flowering.

  • Bavistin 0.1% effective
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