Incidence pattern of pink bollworm, Pectinophora gossypiella (Saund.)on different event Bt and non-Bt cottons

Abstract

A field experiment was conducted at the Agricultural Research Station, Dharwad Farm, Dharwad, Karnatakaduring 2018-19 to evaluate the performance of cultivated cotton genotypes including Bt and non-Bt against pink bollworm,Pectinophora gossypiella (Saund.) under rainfed conditions. Based on seasonal mean green boll damage, Everest (13.56%)performed better against pink bollworm over single gene BG-I Bt variety PAU Bt-1 (16.55%), BG-I Bt hybrid MRC 6918(25.88%) (Both expressing Cry1Ac) and Arjun-21 Cry1A) and BG-II hybrid MRC 7918 (15.52%).DCH-32 (Non Btinterspecific hybrid) had maximum infestation of 37.59 per cent followed by H×H hybrid DHH-263 (36.34%), Suvin(21.38%), DDhc-11 (21.59%), Sahana (20.21%) and DLSa-17 (18.65%). The maximum larval recovery was 12.66 per 20green bolls in DCH-32 followed by DHH-263 (12.58) and Suvin (11.12). In general, Non-Bt genotypes had higher incidencethan Bt genotypes. Similarly, among Bt toxin, Cry1Ac and Cry2Ab expressing genotype had lower incidence.