COMPARATIVE TOXICITY OF SOME IGRs, A MINERAL OIL AND CARBOSULFON AGAINST CANOLA APHID UNDER LABORATORY CONDITION

Canola is an important oil seed crop of the world while insect pest s infestation plays a limiting factor in canola production. The canola aphids are serious pests of this crop and cause maximum damage. Insect growth regulators (IGRs) are compounds which target those metabolic processes that affect growth of insects. Present study was carried out to evaluate the toxicity of some IGRs like, lufenuron, triflumuron, methoxyfenozid, buprofezin, pyriproxyfen and amineral oil (Diver®) in comparison with carbosulfon against aphid. Ten concentrations (0.0625, 0.125, 0.25, .025, 1.0, 2.0, 4.0, 8.0, 8.0, 16.0 and 32.0) of each insecticide were used under laboratory conditions. All the insecticides showed dose dependent toxic effects on both (male and female) aphid population and caused maximum mortality at highest concentration. Methoxyfenzide, lufenuron, pyriproxyfen, triflumuron, buprofezin, Diver® and carbosulfan caused 96.6, 89.9, 90.6, 69.5, 83.4, 84.9 and 78.2% mortality, respectively. The LC50 values show that all the tested insecticides are comparatively less toxic for female and more toxic for male aphids. Though, the used IGRs are reported toxic to the non-target organisms but they show low toxicity as compare to the synthetic insecticides. Thus, the use of these insecticides in aphid control programs will provide positive control with less toxicity to the environment.