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Laboratory ev.luation of toxicity of selected insecticides against egg and larv.l stages of cotton pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae)

引用

Journal of Cotton Research 2024年第1期7卷 15-28页

作者： busnoor abhishek v. WADASKAR R.M. FAND Babasaheb B. TAMBE v.J. PILLAI T. MAHULE D.J. NAGRARE v.S. PRASAD Y.G. Entomology Section College of Agriculture(Dr.Panjabrao Deshmukh Krishi Vidyapeeth)Nagpur 440001MaharashtraIndia Indian Council of Agricultural Research-Central Institute for Cotton Research Nagpur 441108MaharashtraIndia

Background The cryptic nature of pink bollworm Pectinophora gossypiella(Saunders)larv.e enables its reduced v.l-nerability to insecticidal ***,the dev.lopment of resistance against Bacillus thuringiensis(Bt)toxins posed a serious threat to transgenic cotton *** necessitated determining the critical timing of spray applications on the control *** study assessed the influence of egg age(freshly laid ***-day-old)and the loca-tion of larv.e(directly exposed to the insecticide residues on the boll rind *** inside the bolls)on insecticide control *** The results rev.aled a significant decrease in the ov.cidal activ.ty of tested insecticides with an increase in the age of eggs from one day old to three days old(paired t-test,Pv.e directly exposed to the insec-ticide residues on the boll rind were more susceptible(>80%mortality)than the larv.e exposed after they had bur-rowed inside the bolls(v.lopmental biology were more pronounced in the experiment on pre-larv.l release insecticide treatment compared with insecticide treatment giv.n post-larv.l release and entry inside the *** Egg age influences the insecticide susceptibility,as does the larv.l location,directly exposed v. bur-rowed inside the *** eggs and the larv.e that had burrowed inside the green bolls of cotton were relativ.ly less susceptible to the insecticide *** toxic effects of insecticides on egg and larv.l stages were primar-ily *** findings are significant for dev.sing a comprehensiv. strategy for pink bollworm management on a sustainable basis.

关键词： Bioefficacy Cotton Insecticides Pink bollworm Pectinophora gossypiella Timings of spray

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