Effect of Bt (Cry1Ac and Cry2Ab) and non-Bt cotton on the temporal variation of A. grandis and representatives of the Spodoptera complex in Tolima, Colombia

Transgenic cotton plants (Bacillus thuringiensis Berliner (Bt)) has significant influenced the integrated pest management around world. In Colombia, Anthonomus grandis Boheman and Spodoptera complex are currently considered main pests in crops. Therefore, this study evaluated effect of Bt (Cry1Ac Cry2Ab) non-Bt on population fluctuation during two years Tolima region. A Pearson correlation matrix was carried out between variables yield, while climatic insect populations were correlated four phenological stages with Spearman rank correlations. Additionally, a factor analysis for mixed data performed order to compare genotypes insects. For A. grandis, no differences their presented. However, yield showed higher inverse perforated bolls compared cotton. relation complex, genotype had 67.4% fewer larvae Statistically there not total absence entire crop cycle. These results suggest that if refuge zones practices determined area, could generate resistance genetically modified plants.