Relative Incidence of Insect-Pest Complex in Bt and non-Bt Cotton Cultivars

Abstract

An investigation was carried out to find out the relative incidence of pest complex in three cottoncultivars viz., in MECH 162 Bt, MECH 162 non-Bt. The treatments were replicated nine times in randomized block design. The incidence of leafhopper, aphid and whitefly was found in all the three cultivars throughout the crop season, but the worm, Helicoverpa armigera and spotted bollworm, Earias vittella infestation was comparatively less in MECH 162 Btcotton than other cultivars. The maximum incidence of H. armigera was recorded during 14 th and 15 th week after sowing in all three cultivars.

Impact of Environmental Resistance Factors on Abundance of Spotted Bollworm, Earias vittella Fabricius and Helicoverpa armigera Hubner on Bt and Non-Bt Cotton in Odisha

“…The observation on boll damage in Bt cotton (Table 2) revealed that the green boll damage caused by E. vittella in non-Bt cotton was significantly higher as compared to Bt cotton hybrid. The results of the investigation were in accordance with the findings of Kengegowda et al, (2005), Raja et al, (2007) and Pal et al, (2010) who reported the incidence of E. vittella was almost nil in Bt hybrids.…”

INFLUENCE OF WEATHER PARAMETERS ON POPULATION DYNAMICS OF LEAFHOPPER, HISCHIMONUS PHYSITIS IN Bt AND NON-Bt COTTON

“…Since, there are very rare numbers scientific reports on H. physitis as a major pest in cotton, we are taking the support of other leafhopper species viz., A. biguttula biguttula and Emposca sp., to discuss the result of present investigation. This findings are driven support from the study conducted by Reddy et al (2011) found that there was no significant difference of leafhopper population recorded among the various Bt cotton genotypes and Raja et al (2014) and Kalkal et al (2015) found non-significant difference among Bt, non-Bt and conventional hybrids. Likewise, Roomi (2016) observed no difference among Bt and non-Bt cotton genotypes with respect to leafhopper population.…”