Biological characteristics of Heliothis virescens fed with Bt-soybean MON 87701 × MON 89788 and its conventional isoline.

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Author(s): BORTOLOTTO, O. C.; BUENO, A. F.; BRAGA, K.; BARBOSA, G. C; SANZOVO, A.

Summary: ABSTRACT: This study aimed to evaluate the larval biology of Heliothis virescens in soybean MON 87701 x MON 89788 and its isogenic non-Bt. In general, the impact of soybean MON 87701 x MON 89788 on H. virescens was evidenced in all bioassays, 100% larval mortality, independent of the structure (leaf or pod) consumed by the pest. The small larvae (1st and 3rd instar) demonstrated that they were unable to damage fresh pods of soybean, regardless of whether Bt or not Bt. The large larvae (5th instar) fed on soybean MON 87701 x MON 89788 soybeans consumed three times less compared to larvae fed on non-Bt soybeans, and resulted in reduced longevity and larval survival. When soybean plants were infested with 5th instar larvae, H. virescens caused injuries in the steams of the conventional soybean. It was recorded that the insects moves quickly to this region of the plant. However the soybean MON 87701 x MON 89788 was an effective tool in controlling H. virescens. RESUMO: Este estudo objetivou avaliar a biologia larval de Heliothis virescens em soja MON 87701 x MON 89788 e na soja convencional não Bt. De forma geral, o impacto da soja MON 87701 x MON 89788 sobre H. virescens foi evidenciado em todos os bioensaios, com 100% de mortalidade larval, independente da estrutura (folha ou vagem) consumida pela praga. As lagartas pequenas (1° e 3° ínstar) demonstraram que são incapazes de danificarem vagens verdes de soja, independente de ser Bt ou não Bt. As lagartas grandes (5° ínstar) que se alimentaram de soja MON 87701 x MON 89788 consumiram três vezes menos soja comparativamente às desenvolvidas em soja não Bt, além de resultar em menor longevidade e viabilidade larval. No último experimento, as lagartas grandes de H. virescens ocasionaram injúrias na ponteira da soja convencional, verificando-se que a praga se desloca rapidamente para esta região da planta. Entretanto, a soja MON 87701 x MON 89788 é uma eficiente ferramenta no controle de H. virescens.

Publication year: 2014

Types of publication: Journal article

Unit: Embrapa Soybean

Keywords: Lagarta da soja, Plant pests, Praga de Planta

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