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Field evaluation of the egg parasitoid, Trichogramma japonicum Ash. (Hym., Trichogrammatidae) against the rice leaf folder, Cnaphalocrocis medinalis (Guen.) (Lep., Pyralidae) in India

Field trials on the use of Trichogramma japonicum Ashmead against the rice leaf folder Cnaphalocrocis medinalis (Guenee) in India were carried out at 3 locations for 3 years. Four to 9 releases of the parasitoid at 100 000 adults/ha starting from 20 to 38 days after transplanting with a mean of 6.6 to 9.8 days duration between the releases resulted in 3.7 to 59.0% decrease in leaf damage and 1.3 to 10.2 fold increase in egg parasitism. Leaf damage had negative correlation with the number of parasitoid releases.