Performance of Bt cotton and non Bt cotton hybrids against pest complex under unprotected conditions
2009
Prasad, N.V.V.S.D. | Rao, Mallikarjuna | Rao, N. Hariprasad
A field trial was conducted at Regional Agricultural Research Station, Lam, Guntur during 2002-03 to evaluate first generation Bt hybrids released in India for reaction to pest complex of cotton under unprotected conditions. The results revealed that transgenic Bt cotton does not afford any protection to sucking pests of cotton and their tolerance or resistance is mainly dependent on the morphological or genetic base. Helicoverpa armigera incidence was completely absent in RCH 144 Bt as no square damage was recorded followed by lower incidence in RCH 2 Bt(3.3) and RCH 20 Bt(5.95). Where as non Bt versions of RCH 2(7.53), RCH 20(11.95) and RCH 144(9.0) recorded higher damage and significantly differed from their respective Bt counter parts. Pink bollworm per cent green boll damage was also lowest in Bt cotton hybrids compared to their non Bt versions.
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