Selected insecticides viz. Flubendiamide 39.35% SC, Indoxacarb 14.5% SC, Lambda cyhalothrin 5% EC, Novaluron 10% EC, Quinalphos 25% EC, Spirotetramat 120% SC+ Imidacloprid 120% SC Chlorantraniliprole 18.5% SC were evaluated for their effectiveness against tomato fruit borer by conducting field trial at PGI, MPKV, Rahuri during the year 2019. Three sprays of each insecticide were applied at the occurrence of the pest. The result revealed that lowest larval population (1.14 larvae/plant) of H. armigera was recorded in treatment of chlorantraniliprole 18.5% SC. Flubendiamide 39.35% SC (1.51 larvae/plant) was the next promising treatment followed by indoxacarb 14.5% SC exhibiting 1.70 larvae/plant. Treatments viz. spirotetramat 120% SC + imidacloprid 120% SC, lambda cyhalothrin 5% EC, quinalphos 25% EC found to be moderately effective against H. armigera and recorded larval population ranging from 1.99 to 2.27 larvae/plant H. armigera. Novaluron 10% EC was least effective, with maximum (2.42 larvae/plant) population of H. armigera.

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Supervised field trial was conducted to determine the dissipation of mancozeb (based on CS2) in/on onion and in cropped soil resulting from spray application of mancozeb 75 WP at recommended dose (1500 g a.i./ha) and double the recommended dose (3000 g a.i./ha). The initial residues of mancozeb (based on CS2) in immature onion including leaves were found to be 3.44 mg/kg and 5.89 mg/kg at recommended dose and double the recommended dose, respectively. Mancozeb residues (based on CS2) dissipated below limit of quantification (LOQ) on 10 th and 15 th day with half-life values of 1.91 and 2.33 days at recommended dose and double the recommended dose, respectively. The residues of mancozeb (based on CS2) in mature onions and soil collected at harvest were found to be below limit of quantification (LOQ).