The soybean crop is increasing in the northern region of Brazil and it is in adaptation to local conditions of the State of Acre, which raises the possibility of occurrence of insect pests. For this reason soybean pests and their natural enemies were studied in eleven soybean cultivars planted in strips of 40 χ 8m (320m2) in 3520m2. An area of 80m2 in each strip received no insecticide. Four samplings were made each week in each strip (two samplings were made on each controlled and non controlled areas) with a beating cloth method. Stink bug eggs were collected aiming to evaluate parasitoidism level of soybean pests. The most abundant insect was Cerotoma tingomarianus Bechyné (Coleoptera: Chrysomelidae), with higher defoliation in the non controled area, while main predators were Lebia concinna Germar (Coleoptera: Carabidae), Callida sp. (Coleoptera: Carabidae) and Tropiconabis sp. (Hemiptera: Nabidae). Main seed sucking bugs were Piezodorus guildinii Westwood (Hemiptera: Pentatomidae) and Euschistus heros Fabr. (Hemiptera: Pentatomidae), with parasitoidism of 39.9 and 53.3% of eggs of those bugs, respectively. Telenomus podisi Ashmead (Hymenoptera: Scelionidae) was the most frequent parasitoid with 94.5 and 100.0% of eggs of P. guildinii and E. heros parasitized by this natural enemy respectively.
Glycine max ; insect pests; parasitoids; predators