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Results of field studies with the red-shouldered stink bug Thyanta perditor (F.) demonstrated that nymphs and adults are highly abundant in late summer (March) on maturing soybean [ Glycine max (L.) Merrill] plants, and on maturing plants of the weed black jack ( Bidens pilosa L.) in the northern area of the state of Rio Grande do Sul, Brazil. Since soybean is harvested in March, populations decreased sharply in April and resurged somewhat in May. After this month, stink bugs were not observed until late spring in November when adults on maturing wheat plants were captured. Laboratory tests comparing the bug preference for seedlings of cultivated plants indicated that soybean and maize ( Zea mays L.) were preferred hosts compared to wheat ( Triticum aestivum L.) and barley ( Hordeum vulgare L.). For non-cultivated plants (weeds), seedlings of milkweed ( Euphorbia heterophylla L.) and of flax-leaf fleabane ( Conyza bonariensis L.) were preferred over those of signal grass [ Brachiaria plantaginea (Link)] and black jack. Seedlings of non-cultivated plants were preferred over cultivated ones, in particular milkweed and black jack. Resultados de estudos em campo com o percevejo Thyanta perditor (F.) demonstraram que ninfas e adultos foram mais abundantes no final do verao (marco) em soja [ Glycine max (L.) Merrill] em fase de maturacao e em picao-preto ( Bidens pilosa L.) em Passo Fundo, no norte do Rio Grande do Sul, Brasil. Apos a colheita da soja em marco, as populacoes diminuiram em abril e reapareceram em maio. Apos maio, nao foram constatados percevejos ate o final da primavera em novembro, quando foram capturados adultos no trigo em maturacao. Testes em laboratorio indicaram que plântulas de soja e milho ( Zea mays L.) foram hospedeiros preferidos em comparacao ao trigo ( Triticum aestivum L.) e cevada ( Hordeum vulgare L.). Plântulas de ervas daninhas, como o leiteiro ( Euphorbia heterophylla L.) e a buva ( Conyza bonariensis L.) foram preferidas em relacao as plântulas de capim-papua [ Brachiaria plantaginea (Link)] e picao-preto. Em geral, plântulas de especies nao cultivadas foram preferidas comparado com plântulas de especies cultivadas, em especial o leiteiro e o picao-preto.

Seasonal abundance of Thyanta perditor (F.) (Heteroptera: Pentatomidae) and its preference among cultivated and non-cultivated plants