Efficacy of plant extracts on some cotton (Gossypium hirsutum) pests: Amrasca bigutulla bigutulla Ishida and Thrips tabaci Lindeman
2012
Fiaz, M. (Entomological Research Inst., Faisalabad (Pakistan)) | Hameed, A. (Cotton Research Station, Multan (Pakistan)) | Mansoor-ul-Hasan (University of Agriculture, Faisalabad (Pakistan). Dept. of Entomology) | Wakil, W.
Jassids (Amrasca bigutulla bigutulla Ishida) and thrips (Thrips tabaci Lindeman) have become major pests in subcontinent due to invasion of Bt cotton. Insecticidal resistance by these pests is another threat, keeping in view these facts five plants derivative viz., Lemon oil, Bittergourd (Momordica charantia L) extract, bakain (Melia azadarach) leaf extract, Neem (Azadirachta indica) oil and Neem (A. indica) leaf extract, each at a 5% concentration were tested for their repellency and phagodeterrent effects against jassid and thrips with three applications upon emergence of pest population. The variety CIM-496 was sown during 2008 at experimental area of the department of Agriculture, Entomology, University of Agriculture, Faisalabad. Six treatments including control were maintained following Randomized Complete Block Design with three replications. The plant derivatives were applied three times at the interval of 20 days. Data were recorded at 24, 48, 72 hrs, and 7 days intervals after application of each treatment. Results revealed that lemon oil proved to be the most effective plant derivative against jassid followed by neem oil, bakaine, bitter gourd and neem leaf extract in all three applications. In case of thrips all plant derivatives controlled thrips population significantly. Bakain leaf, extract, neem oil and neem leaf extract showed comparatively higher mortality of the thrips as compared to other plant derivatives. Studies concluded that plant derivatives can be good alternatives to chemical pesticides to control sucking pests complex especially jassids and thrips in Pakistan
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