Increasing the amount of percolating water from 20 mL(equivalent to 51.92 mm rainfall) to 160 mL (equivalent to 415.42 mm rainfall) increased the downward mobility of flubendiamide. Major portion of the soil applied formulation of flubendiamide (67.22%) was recovered from the top 0-5 cm soil layer after passing 160 mL water. After percolating 160 mL of water (equivalent to 415.42 mm rainfall) analytical grade flubendiamide leached down upto 15-20 cm depth and 68.06% of the applied insecticide was retained in the top 5-10 cm layer. Metabolite desiodo flubendiamide was detected in 20-25 cm layer (9.47%) after passing 160 mL water because of its higher mobility. Adsorption of flubendiamide was positively related with organic matter content and negatively with pH. The sorption coefficient values studied in two different soil orders ranged from 1.07 in topsoil from Inceptisol and 2.13 in topsoil from Alfisol. The higher cumulative desorption and proportional desorption in topsoil from Inceptisol than in topsoil from Alfisol may be due to lower organic carbon content of the former than the latter.

Spinosad, a mixture of spinosyn A and spinosyn D, produced by a soil actinomycete Saccharopolyspora spinosa Mertz & Yao. It has been found to be effective for the control of a number of pests of tomato (Lycopersicon esculentum Mill.; synonyms of Solanum lycopersicum) namely, fruit borer (Helicoverpa armigera), leaf miner (Liriomyza spp.), white fly (Bemicia tabaci), etc. The persistence study of spinosad in/on tomato was carried out in the field of IARI, New Delhi. Analytical method for Spinosad estimation was standardized. Acetonitrile extraction followed by silica SPE cartridge clean up with dichloromethane - methanol as eluting solvent mixture gave the highest recovery. Dissipation behavior of spinosad was studied at different moisture level soil as well as at different pH. Spinosad is highly unstable under UV light. Spinosad has low persistence both in/on tomato and soil under field conditions. Tomato fruits are thus found to be safe for consumption when spinosad is applied at the recommended dose. So, spinosad can be a component in Integrated Crop Management programmes.

Trend in dissipation was submerged (T1/2 150.5-158.4 days)