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Abstracts - Katia M. Inoue

CHEMICAL CHARACTERIZATION OF THE SEX PHEROMONE OF

Leptoglossus zonatus (HEMIPTERA: COREIDAE)

Katia M. Inoue1, Emir B. Saad1, Camila B. C. Martins1; Diogo M. Vidal2 and Paulo H. Zarbin1*

1 Laboratório de Semioquímicos, Departamento de Química – Universidade Federal do Paraná, PR, Brazil; kmiyuki.inoue@gmail.com

2 Departamento de Química – Universidade Federal de Minas Gerais, MG, Brazil; vidal@qui.ufmg.br

* pzarbin@ufpr.br

The leaf-footed bug, Leptoglossus zonatus (Dallas) (Hemiptera: Coreidae), is a polyphagous pest that has a distribution range that extends from the northern United States to southern Argentina (Mantragolo and Waquil, 1994)1. In Brazil, it is mainly reported as a pest of maize, feeding on seeds and reducing the quality of the maize. To reduce the use of insecticides, alternative methods are necessary, such as the use of pheromones. The aim of this study was to evaluate and identify the volatiles compounds of the sex pheromone of L. zonatus. Males and females of L. zonatus were placed in aeration chambers to collect their volatiles. The extracts were analyzed by GC/MS suggesting the presence of nine specific compounds in the male extracts. Bioassays were conducted in “Y” olfactometer to evaluate the response of adults to male extracts. Only females responded to male volatiles combined with the host plant, suggesting the existence of a sex pheromone. Female antennae showed a positive response to five components of the male extract using GC-electroantennographic detector. These compounds were identified by GC/MS and GC/FT-IR indicating the presence of 3,7- dimethyl-1,3,6-octatriene (1), 2,6-dimethyl-2,4,6-octatriene (2), decanal (3), α-trans- bergamotene (4) and (E)-β-farnesene (5). Bioassays using the blend and individual synthetic compounds are currently ongoing.

Refs.

1. Mantragolo, W. J. R.; Waquil, J. M. An. Soc. Entomol. Brasil, 23, 3, 1994.