Desempenho do algodão-Bt 1 no controle de pragas em condições de campo

Abstract

In Brazil, the use of cotton crop cultivars genetically modified to express resistance to pest attack is an innovative method of control. Thus arose the demand for national surveys in order to evaluate the cotton crop-Bt1 (Bollgard®) on a commercial scale, because there is lack of information about the behavior of this technology in several cotton producing regions in the Brazil. For this were conducted during the seasons 2006/2007 and 2007/2008 experiments in Maracaju / MS comparing a cultivar with technology "Bt1" with its isoline non-Bt. These experiments were conducted with six plots of each treatment with ten rows of cotton cultivation with ten feet long each, which were evaluated and managed populations of pestsarthropod associated with cotton crop as a commercial field of cotton production. The results of the two seasons showed high agronomic efficiency of cotton crop-Bt1 in control of Heliothis virescens and Alabama argillacea, where the resistant variety to these pests now provides an increase in net income in the cotton production of the R$ 434,18. ha-1 and R$ 135,12. ha-1 for the 2006/2007 and 2007/2008 seasons respectively, caused by increased of productivity and decrease of costs for control of the pests target of these technology.