Rice Leaf Folder: Cnaphalocrosis medinalis (Guenee) (Lepidoptera: Pyralidae)

Kannada name :  Yele Suruli Hulu, Yele Madachuva Hulu, Gari Suttuva Hulu

Damage symptoms

• Longitudinal white and transparent streaks on leaf blades are created which later giving scorched appearance.
• Folded leaf with larva inside along with excreta
• Sickly appearance of the filed

                     

  Transparent streaks                Leaf folding                        RLF affected field               

Management

Biological control

• Five to six releases of the egg parasitoid Trichogramma  chilonis @1,00,000 adult parasites per hectare starting from 15 days after planting, in a crop season is effective and economical.
• Entomopahogenic bacteria such as Bacillus thuringiensis Berliner and a granulosis virus cause mortality of rice leaf folder larvae.

Chemical control

• ETL: 1 larva per tiller
• 10-12 DAS  1ml of methyl parathion 50EC or 0.5ml fenitrothion 100EC or 0.9ml diazinon 60EC or 1.3ml monocrotophos 36SL or 2ml chloropyriphos 20 EC or 1.5ml fenthoate 50EC or 2ml phasalone 35EC or 2ml endosalfon 35EC or 2ml quinolphos 25EC in 1 liter of water  for spraying on crop.
• Transplanted field require 225-230liter/ha spraying chemical or carbofuron 3% @7.5kg/acre granules can be used.