Biology in different temperatures and thermal requirements of stink bugs pests of soybean. II. Euschistus heros (Fabr.) (Heteroptera: Pentatomidae)

Abstract

The biology of Euschistus heros (Fabr.) was studied in incubators adjusted to 20, 22, 26, 28 and 30°C, with 14 hours of photophase and 70±10% RH. The diet consisted of green soybean pods ('Paraná' and 'Cristalina') and dry soybean seeds ('Paraná') and raw peanuts shelled ('Tatu Vermelho'). Viability of the nymphal phase was not affected by temperature and there was no oviposition by non-feeding females. Temperatures of 26 and 28°C were more adequate for oviposition. The low threshold temperature and the thermal constant of the egg and nymphal phases and of the life cycle were, respectively, 13.6°C and 66.1 degree-days, 14,4°C and 261.8 degree-days, 14.2°C and 327.8 degree-days.