Geometrids on soybean: seasonal fluctuation and resurgence after insecticide application

Abstract

A survey of geometrid caterpillars was carried out in soybean plots during 1976, on cultivar ‘Bragg’ and ED 73-371 lineage, and on cultivar ‘UFV-1' during the 1976 and 1977 seasons. The following species were collected: lridopsis vacillaria Walker, Oxydia nimbata Guenée, Semiothisa regulata Fabricius, Semiothisa sp., Stenalcidia sp. Geometrid larvae were collected in greater numbers from mid pod-filling to the maturity stage. Resurgence of the pest population occurred each four weeks after insecticide application, being two times more abundant in treated than in untreated plots.