Evaluation of some acaricides against two spotted spider mites, Tetranychus urticae Koch (Acari: Tetranychidae) on cotton crop under laboratory and field conditions
2012
Amjad, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agricultural Entomology) | Bashir, M.H. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agricultural Entomology) | Gogi, M.D. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agricultural Entomology) | Aslam, M. (Pest Warning and Quality Control of Pesticides, Punjab (Pakistan)) | Zia, K. | Khan, M.A. | Ali, L.
The study was carried out to determine the efficacy of some commercially available acaricides against Two Spotted Spider Mites (TSSM), Tetranychus urticae Koch in the laboratory and field conditions at Department of Entomology, University of Agriculture, Faisalabad, Pakistan during summer 2010. The chlorfenapyr 36 SC, pyridaben 15 EC and fenpyroximate 5 SC proved to be the best miticides among the tested ones for the control of TSSM based on their LC50 values in the lab and percent mortality in the field. All the tested 50 acaricides caused significant mortality in the lab as well as in the field up to 72 hours after treatment. The chlorfenapyr (87-100 % mortality in the field and the lab) was the most effective; whereas, dicofol (32-38 % mortality in the field and lab respectively) was least effective. However, the fenpyroximate showed the lowest LC50 value (5.18 mg l-1) in the lab 50 tests 48 hours after treatment proving its effectiveness against mites. The recommended application rates used in the field and the LT50 values further suggested judicious use of 50 effective acaricides.
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