Bioefficiency persistence and residue dynamics of carbofuran in bittergourd (Momordica charantia L.)

Abstract

Studies were undertaken to assess the bioefficiency, persistence and residue dynamics of carbofuran in bittergourd (Momordica eharantia L.). Carbofuran was applied at two doses, 0.75 and 1.5 kg ai/ha at different growth stages, namely sowing, vining, flowering and at all the above three stages of the bittergourd crop. An untreated control was also maintained to compare the effects of various treatments. All the treatments recorded lower population of epilachna beetle (Henosepilachna 28 punctata Fab.) than control. But the treatment wherein carbofuran ® 1.5 kg ai/ha applied at the time of sowing, vining and flowering was found to be the most effective one in controlling the epilachna beetles with 95,79 per cent reduction over control 80 days after sowing. In controlling the red pumpkin beetle Raphidopalpa feveicollis Lucus. and melon fruit fly Dacus cucurbitae Coq. also the same above treatment was found to be the most effective one. The percentage of reduction in incidence of fruit fly was of the order of 79.72 over control in terms of fruit damage by number and 83.35 by weight. The treatment in which carbofuran Q 0.75 kg ai/ha applied at the time of sowing was found to be least effective in controlling the above pests.