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Field Evaluation of Zoophthora radicans against Rice Leaf Folder, Cnaphalocrocis medinalis

Department of Entomology, Annamalai University, Annamalai Nagar-608 002 (Tamil Nadu), India
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(Received : October 14, 2019; Accepted : December 18, 2019)


A field trial was conducted during August 2018 to January 2019 to evaluate the mycological suppression of rice leaf folder in two different formulations like oil-based bio-formulation and granular formulation of
Zoophthora radicans in experimental farm, Department of Agriculture, Annamalai University. The field trial was laid out in a randomized block design (RBD) in oil formulation with seven treatments and granular formulation with five treatments, replicated six times in plot size 5 × 4 m each, with the variety CR-1009. The data on effect of various treatments against rice leaf folder indicated that Z. radicans + Sunflower oil + Glycerol had comparatively higher reduction of infestation to the tune of 35.25% over control after the first spray. This was followed by Z. radicans + Mustard oil + Glycerol, Z. radicans + Sunflower oil and Z. radicans + Mustard oil (26.33, 26.13 and 24.24%, respectively). During the second spray Z. radicans + Sunflower oil + Glycerol recorded the maximum of 69.96% reduction over control. This was followed by Z. radicans + Mustard oil + Glycerol and Z. radicans + Sunflower oil (59.87 and 57.87%, respectively). Among the different
doses of Z. radicans granules, 400 g Z. radicans granules/plot was found effective by recording 25.29% reduction over control. This was followed by dose of 300 g/plot treatment. During the second spray, similar trend was noticed wherein the maximum reduction in leaf folder population was noticed in plot which received dose of 400 g/plot treatment (57.23%). Lowest per cent reduction of C. medinalis population was noticed on dose of 100 g/plot (46.02% reduction over control). Among the different treatments of oil and granular formulation, oil formulation of Z. radicans caused the highest per cent reduction over control when compared to granular formulation of Z. radicans.
Key words : Rice leaf folder, Zoophthora radicans, oil formulation, granular formulation