A population survey of stinkbugs and incidence of egg parasitoids in organic soybean fields
Abstract
The aims of this study were to identify the phytophagous stinkbugs, their population levels and egg parasitoids in organic managed soybean. The study was carried out during 2004/2005 in three soybean crops located at Três de Maio, Três Passos, and São José do Inhacorá Counties, Rio Grande do Sul State. Experimental unities consisted of two plots of 1,800 m2 in each field. The bugs were sampled using the ground cloth and shake technique, in six random points at each plot. Additional six randomly selected soybean plants were examined for search and collect the stinkbugs eggs. From 400 collected bugs, Piezodorus guidinii was the most frequent (53,75%), followed by Nezara viridula (17,75%), Dichelops furcatus (12%), Edessa meditabunda (7%), and Acrosternum impcticorne (4,75%). Parasitoids were detected only in N. viridula, D. furcatus, and A. impcticorne eggs. Five species of egg parasitoids were identified: Trissolcus basalis, Trissolcus urichi, Trissolcus brochymenae, Telenomus sp. e Telenomus podisi.
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