Residues of Imidacloprid, Acetamiprid and Thiamethoxam in Gram

Experiments were conducted to study the persistence of imidacloprid, acetamiprid and thiamethoxam in gram following seed dressing (3 and 6 g ai kg⁻¹ seed) and foliar application (imidacloprid @ 20 and 40 g ai ha⁻¹ and acetamiprid and thiamethoxam @ 25 and 50 g ai ha⁻¹). Following seed dressing, thiamethoxam and acetamiprid translocated into foliar parts. The residues in green plant persisted beyond 30 days after sowing However, no residues were detected in green plants after 45 days. Following foliar spray, the persistence of all the insecticides was short The residues of imidacloprid persisted beyond 3 days but no residues were detected on 5^th day Similarly the residues of thiamethoxam and acetamiprid persisted beyond 5 days but no residues were detected on 10^th day except for high dose of thiamethoxam Similar trend was observed in combine treatment (seed dressing + foliar spray) of thiamethoxam No residues of any insecticide were detected in harvested seed and fodder samples.