Impact of Bt transgenic cotton on population dynamics of aphids and natural enemies

SHASHIKANT S UDIKERI; B V PATIL; K BASAVANAGOUD; B M KHADI; K A KULKARNI; H M VAMADEVAIAH

doi:10.56093/ijas.v82i6.19046

Authors

SHASHIKANT S UDIKERI University of Agricultural Sciences, Dharwad, Karnataka 580 007
B V PATIL University of Agricultural Sciences, Dharwad, Karnataka 580 007
K BASAVANAGOUD University of Agricultural Sciences, Dharwad, Karnataka 580 007
B M KHADI University of Agricultural Sciences, Dharwad, Karnataka 580 007
K A KULKARNI University of Agricultural Sciences, Dharwad, Karnataka 580 007
H M VAMADEVAIAH University of Agricultural Sciences, Dharwad, Karnataka 580 007

https://doi.org/10.56093/ijas.v82i6.19046

Keywords:

Aphid, Chrysoperla, Cotton, Cry, Predators

Abstract

The dynamic aphids and its predator in RCH 2 Bt and non-Bt cotton hybrids was studied to know the effect of Cry toxin. The mean incidence of aphids was 23.82 and 21.37/ leaf in Bt and non-Bt cotton respectively indicating no significant variation. Mean population of coccinellids, Chrysoperla and syrphids was 0.89, 0.78 and 1.0/plant in RCH 2 Bt which was almost similar to the incidence on RCH 2 non Bt. There was strong and positive correlation between incidence of predators and aphid on both Bt and non- Bt cotton. The ‘r’ value for syrphids v/s aphids was 0.94 in RCH 2 Bt and 0.96 in non- Bt. The feeding assay with Bt intoxicated cotton leaves could not affect the biology and feeding potential of Chrysoperla.

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