Compatibility of Selected Insecticides Against Sucking Insect Pests of Cotton Under Field Conditions
Compatibility of Selected Insecticides Against Sucking Insect Pests of Cotton Under Field Conditions
M. Tariq Mushtaq1, Faisal Manzoor1, M. Ishtiaq1*, Mirza Abdul Qayyum1, Muqarrab Ali2, M. Akram3, M. Rafiq Shahid3 and Saleem Riaz1
ABSTRACT
Cotton is an important cash and fiber crop of Pakistan. Cotton sucking insect pests cause major losses in yield of this crop. Chemical insecticides due to their quick mode of action are considered as the most effective way among the farmers for controlling these insect pests. Present study was designed to evaluate the compatibility of different insecticide mixtures against sucking insect pests i.e., whitefly and jassid. Compatibility of four insecticides combinations i.e., buprofezin + flonicamid, buprofezin + nitenpyram at recommended and half dose of recommended for two years. In separate experiment two combinations of pyriproxyfen + imidacloprid and pyriproxyfen + matrine applied at recommended doses (RD) and 1/2 of recommended doses (HD) were applied on cotton crop against whitefly and jassid in consecutive two years. Randomized complete block design (RCBD) was used for each experiment with three replications each year. Data were recorded 1 DBS (day before spray) and 3 DAS (days after spray) and 7 DAS of insecticides. The results revealed that buprofezin @ 500 ml + flonicamid @ 60 g (RD) was the most effective (79.24%) insecticide mixture against whitefly up to seven days followed by pyriproxyfen + matrine @ 250 and 500 ml (RD) with 74.13% reduction. While mixture of buprofezin + nitenpyram at recommended dose was effective against jassid and whitefly (76.47%) followed by pyriproxyfen + imidacloprid (71.03%). Therefore, application of insecticide mixtures reduced population of spiders, green lacewing and pirate bugs population as compared with control (untreated plot). Almost all combinations were effective as compared to control treatments even at half doses. So, these insecticides could be applied in rotation with each other to reduce insecticides resistance and combined attack of whitefly and jassid. However, it is recommended that integrated pest management approach using different control tactics for conservation of natural enemies, use of yellow sticky traps, botanicals, use of selective insecticides when needed could be the best strategy to overcome insecticides resistance problems.
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