N. R. PATEL, R. K. JAIMAN1 AND B. G. PRAJAPATI

A field trial was undertaken at Centre for Research on Seed Spices, Jagudan during rabi 2010–11 and 2011–12 to determine the effective doses of tolfenpyrad 15EC against aphids and thrips on cumin alongwith neonicotinoid group of insecticides. Eight treatments of tolfenpyrad 15EC@ 100g a.i./ha, 125g a.i./ha, 150g a.i./ha, 300g a.i./ha(only for phytotoxicity), imidacloprid 17.8SL@ 25g a.i./ha, acetamiprid 20SP @ 20g a.i./ha, thiamethoxam 25WG @ 25g a.i./ha and untreated control were evaluated against aphids and thrips in cumin. Among them, tolfenpyrad15 EC at 125 and 150g a.i./ ha were highly effective in controlling the aphids and thrips in cumin. Mean number of coccinellids, syrphids, spiders and Chrysoperla carnea did not differ in different treatments during both the years of experimentation.Tolfenpyrad 15EC@ 150g a.i./ha maximum seed yield of cumin(415 kg/ha) as compared to the rest of the treatments. Minimum avoidable loss (5.54%) in seed yield of cumin was observed in tolfenpyrad 15EC@ 125g a.i./ha. The highest dose of tolfenpyrad 15EC@300g a.i./ha did not produce any phytotoxicity symptoms on the treated crop.