The study was carried out to predict, in the field, the occurrence of populational peaks of adults of Piezodorus guildinii (West.), Nezara viridula (L.) and Euschistus heros (Fabr.) (Heteroptera: Pentatomidae), using a degree-day model. Considering the development of the biological cycle, it was observed that more than 70% of adult emergence of P. guildinii, N. viridula and E. heros occurred when means of 307.7, 753.8 and 370.3 degree-day respectively had been accumulated. The differences between predicted and observed dates for emergence were 0-3 days for P. guildinii and N. viridula and 5-6 days for E. heros.
Insecta; Piezodorus guildinii; Nezara viridula; Euschistus heros; Glycine max; degree-day
