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Biocontrol potential of entomopathogenic nematode,Heterorhabditis indica against pink bollworm,Pectinophora gossypiella(Saunders)(Lepidoptera:Gelechiidae)

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Journal of Cotton Research 2023年第4期6卷 277-287页

作者： THUBE Shivaji SHINDE Swati SHAH Vivek GOKTE‑NARKHEDKAR Nandini INGOLE Dnyaneshwar NIKOSHE Akash tenguri prabhulinga THAVKAR Snehal FAND Babasaheb DESHMUKH Vrushali PRASAD Yenumula Indian Council of Agricultural Research-Central Institute for Cotton Research NagpurMaharashtra 440010India College of Agriculture NagpurMaharashtra 440001India Dr.Balasaheb Sawant Konkan Krishi Vidyapeeth DapoliMaharashtra 415712India

Background The emergence of pink bollworm(PBW),Pectinophora gossypiella(Saunders)(Lepidoptera:Gelechiidae),in cotton due to Bt resistance and concealed feeding habit has created a need for alternative,eco-friendly,and cost-effective control *** study aimed to evaluate the bio-efficacy and reproductive potential of two native strains of entomopathogenic nematodes(EPNs),Heterorhabditis indica,namely CICR-HI-CL and CICR-HI-MN,against PBW larvae and pupae under in-vitro *** The larval assay revealed that strain CICR-HI-CL exhibited higher potency than strain CICR-HI-MN against 2nd,3rd,and 4thinstar larvae,with median lethal dose(LD50)values of 5.45,4.45,and 4.60 infective juveniles(IJs)per larva,*** case of pupal bioassay,both EPN strains demonstrated greater virulence when applied directly(LD50values:29.65 and 73.88 IJs per pupa for strains CICR-HI-CL and CICR-HI-MN,respectively)compared to soil application(147.84 and 272.38 IJs per pupa).Both EPN strains successfully penetrated and reproduced on 4thinstar larvae,resulting in maximum production of 19.28 and 20.85 lakh IJs per larva in the next generation when inoculated at 30 IJs per *** The present study has generated useful information on the virulence and reproductive potential of two strains of EPN ***(CICR-HI-CL and CICR-HI-MN)against PBW,a dreaded pest of *** virulence and reproductive potential of EPN strains demonstrated their ability to multiply,sustain and perpetuate on larval and pupal stages of *** knowledge generated will help formulate effective management strategies for PBW with the inclusion of EPN as a potential biological control *** soil-dwelling life stages viz.,last instar hibernating larvae and pupae of PBW can be the ideal weak links to make a successful use of *** for sustainable management of PBW in the cotton ***,before taking these EPN strains to field for managing PBW,detailed studies investigati

关键词： Bio-efficacy Entomopathogenic nematodes Multiplication rate Heterorhabditis indica Pectinophora gossypiella

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