ABSTRACT
Results of research initiated in 1995 that utilized field size units of approximately 25 acres to evaluate Bt-transgenic cotton and conventional, non-Bt cotton grown in major regions of Mississippi are discussed. Insect populations identified by 5 years of sampling are graphically examined. A general shift of heliothine egg lay earlier in the season is identified. Tarnished plant bug infestations in the hills are considerably less than those in the delta of Mississippi, and in this study populations tended to be about the same on Bt-cotton and non-Bt cotton. Heliothine egg deposition does not differ between Bt and non-Bt cotton, but population characteristics are different between the hill and delta regions. Aphid populations appear to be similar in Bt and non-Bt cottons, and appear to be higher in the hills than the delta.
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