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Persistence of some new insecticides in brinjal and their efficacy against brinjal leaf hopper and borer



Persistence of some new insecticides in brinjal and their efficacy against brinjal leaf hopper and borer



Pesticide Research Journal 19(2): 205-209



Persistence and efficacy of bifenthrin (10 EC, 25 and 50 g ai ha(-1)), fipronil (5SC, 50 and 100 g ai ha(-1)) and carbosulfan (25 EC, 187.5 and 375 g ai ha(-1)) along with endosulfan (35 EC, 700 g ai ha(-1)) was studied in brinjal crop following two spray applications. Residues of bifenthrin, fipronil and endosulfan were analysed by GLC and carbosulfan by HPLC. The residues of bifenthrin, fipronil and endosulfan in brinjal fruits persisted beyond 10 days. The residues of carbosulfan persisted only for 3-7 days. The dissipation of all the insecticides followed first order kinetics with half-life of similar to 2.5 days for bifenthrin, 2.5-3.5 days for fipronil, 1.8-2.3 days for carbosulfan and 2.9 days for endosulfan. All the insecticides were found to give effective control of leafhopper and shoot and fruit borer in brinjal. The order of efficacy against leafhopper was fipronil 100 g ai ha(-1) (T-4) > fipronil 50 g ai ha(-1) (T-3) > carbosulfan 187.5 g ai ha(-1) (T-5) = endosulfan 700 g ai ha(-1) (T-7) > bifenthrin 25 g ai ha(-1) (T-1) > bifenthrin 50 g ai ha(-1) (T-2) and against shoot and fruit borer was carbosulfan 375 g ai ha(-1) (T-6) > fipronil 100 g ai ha(-1) (T-4) > endosulfan 700 g ai ha(-1) (T-7) > bifenthrin 50 g ai ha(-1) (T-2) > carbosulfan 187.5 g ai ha(-1) (T-5). Based on ADI' values, a waiting period of 1 day is suggested for bifenthrin, carbosulfan and endosulfan and 7 days for fipronil.

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