During the seasons of 1980/81 and 1981/82, the performance of eight soybean lines (IAC 73-228, IAC 77-3802, IAC 77-3823, IAC 78-2296, IAC 78-2318, IAC 78-3258, IAC 78-3278 and D72-9601-1) and two cultivars (Santa Rosa and TMU) was evaluated in relation to the attack of stink bugs in the field, at Campinas, State of São Paulo, Brazil. In the season of 1980/81, the low natural infestation of Piezodorus guildinii (West.) and Nezara viridula (L.) was supplemented by liberation of Euschistus heros (Fabr.) adults collected on soybean crops; in the following season, the high natural infestation was sufficient to cause severe damage to soybeans. Seven criteria of damage evaluation were utilized: foliar retention, yield, yield divided in four damage classes, percentage of the damage grain weight, weight of hundred seeds, oil content and germination percentage. The line IAC 73-228 confirmed its resistance and the same performance was observed for the IAC 78-2318. Nevertheless, both these lines have as unfavourable characteristics, small seeds and low oil content.
soybean; Glycine max (L.) Merrill; stink bugs resistance; Pentatomidae; Nezara viridula (L.); Piezodorus guildinii (West); Euschistus heros (Fabr.)