Population Dynamics of Omiodes indicata (Fabricius) (Lepidoptera: Pyralidae) on Soybean in Brazil

An observed increase in the populations of Omiodes indicata (Fabricius) in Brazil’s soybean crops is causing population outbreaks. Specimens were collected at Experimental Farm Lageado, in São Paulo State University (UNESP), Faculty of Agronomic Sciences, Botucatu, São Paulo, Brazil. Samples of individuals (larvae and pupae) were collected in the field and kept in the laboratory until emergence of adults to confirm the species. The species O. indicata occurred in four soybean areas with no previous record of this pest. The population dynamics showed that this lepidopteran is present throughout crop development, with population peaks occurring during the reproductive period of soybean. These observations are unique to this crop and planting site, showing that the insect has been adapting to the conditions of the region where it was found, demanding attention from soybean producers.