Evaluation of Selected Granular and Spray Formulations of Insecticides Against Insect Pests in Rice

Granular-formulations of ethoprop, cartap, isazophos (0.7S kg a.i./ha each), diazinion (1.0 kg a.i./ha) and spray formulations of furathiocarb, pyridaphenothion, BPMC (0.7S kg a.i./ha each), ethofenprox (0.05 kg a.i./ha), Dowco 473 (0.1 kg a. i./ha) and carbaryl (0.5 kg a. i./ha) were evaluated against rice insect pests under field conditions for four seasons. Granules of ethoprop, cartap and isazophos were more effective than carbofuran (1.0 kg a. i./ha) against stem borer and leaf folder, while ethoprop and isazophos were effective against gall midge. Against brown planthopper, cartap and isazophos were as effective as carbofuran. Among the spray formulations, furathiocarb, pyridaphenothion, BPMC and ethofenprox were moderately effective against stem borer, while pyridaphenothion, ethofenprox and Dowco 473 exhibited moderate efficacy against leaf folder similar to chlorpyriphos (0.5 kg a.i./ha). Ethofenprox and carbaryl were found to be effective against BPH and safer to mirid bug predator. Cartap and isazophos produced grain yields similar to carbofuran while ethofenprox yielded similar to chlorpyriphos.