The field evaluations with the Bollgard Cotton event 531 conducted in cotton-producing regions in Brazil showed that there are no significant differences in morphologic features and in agronomic performance in relation to the Coker 312 non-transformed parental lineage. The following parameters were evaluated: effectiveness in the control of target-insects during the crop; plant growing and development morphologic features as germination, plant vigor, flowering, number and size of cotton bolls; susceptibility to plagues and diseases; yielding; fiber quality such as length, micronaire (fiber fineness and weaving capability), yarn resistance and elongation capability; and grain composition, where proteins, fats, fibers, carbohydrates, aminoacids, mineral residues, caloric contents, lipids, fatty acids, a -tocopherol, gossypol, and aflatoxins were evaluated.

The results of researches made in Brazil are similar to those observed in other countries. The levels of insect-laying plagues A. argillacea/P. gossypiella , and H. virescens in the Bollgard cotton event 531 were similar to those observed in the non-transformed parental lineage. The protein CrylAc expressed by plants of genetically modified cotton controlled and maintained the plague P. gossypiella within population satisfactory levels, even in high population pressure situations. The plagues A. argillacea and H. virescens had not a significant presence along the culture cycle of the Bollgard Cotton event 531 in evaluated experiments. The parasitism levels observed in eggs of A. argillacea and H. virescens species in the genetically modified lineage showed that parasitoids were not affected by the insecticide effect of protein CrylAc, compared with the non-transformed parental lineage.