CONICET | Buscador de Institutos y Recursos Humanos

ABSTRACT. Considering the development of the soybean crops using direct tillage in Benito Juárez county, and that for some authors this practice favours the grasshoppers population, the abundance and richness species in soybean with direct and conventional tillage were evaluated. Seven species were registered (Aleuas lineatus Stål, Covasacris pallidinota (Bruner), Baeacris pseudopunctulatus (Ronderos), Dichroplus elongatus (Giglio-Tos), Dichroplus maculipennis (Blanchard), Dichroplus pratensis Bruner and Scotussa lemniscata (Stål). The accumulated richness was similar (p> 0.05), along the different crops; 2.3 ± 0.19 species were registered in soybean crops first seedtime with direct tillage, 1.45 ± 0.15 species in soybean with conventional tillage and 2.25 ± 0.28 species in soybean second seedtime with direct tillage. Dichroplus elongatus was the most abundant grasshopper in all crops and every sampling moment. The remaining species had low abundance and were recorded in some samples. There was not difference (p> 0.05), in the grasshoppers abundance in the different soybean crops at the different sampling times. Low grasshopper richness species values were registered and this could be due to the low plants diversity of agricultural systems. The results of this study showed no differences in abundance and richness species among different systems of tillage of the soybeans crops.