INFLUENCE OF TRANSGENIC MAIZE ON BEHAVIOR OF ADULT FEMALE OF Spodoptera frugiperda (J. E. SMITH) (LEPIDOPTERA: NOCTUIDAE)

Priscilla Tavares Nascimento,Camila Da Silva Fernandes Souza,Renzo Garcia Von Pinho,Fernando Hercos Valicente,Marcos Antonio Matiello Fadini

doi:10.18512/rbms2020v19e1142

Abstract

It is known that genetic manipulation of plants can cause pleiotropic effects or mutations originated from the incorporation of an exogenous gene, which may interfere with foraging of herbivores. Little is known about how herbicide-tolerant plants (singular event), insect-resistant plants (singular event), and herbicide-tolerant plus insect-resistant plants (stacked event) affect foraging of Spodoptera frugiperda. The objective of this study was to evaluate if singular and stacked maize events interfere with the quantity and quality of S. frugiperda eggs. The hybrids DKB390 (VTPRO, VTPRO2, VTPRO3), DKB390 (isogenic) and Ag 3700 RR2 were evaluated. Choice and non-choice tests for oviposition preference of S. frugiperda, in plants with and without injuries, were performed in a greenhouse. The size of egg masses and the number of hatched larvae were evaluated. Larger egg masses and higher number of hatched larvae per plant were found in transgenic plants. The conclusion was that S. frugiperda females modify their oviposition behavior in the presence of transgenic and non-transgenic maize hybrids, especially when they are injured. However, the females do not discriminate between singular or stacked hybrid for oviposition.

Highlights

INFLUÊNCIA DO MILHO TRANSGÊNICO NO COMPORTAMENTO DE FÊMEAS ADULTAS DE Spodoptera frugiperda
Due to the intensive use of Bacillus thuringiensis (Bt) technologies and especially to the adoption of pyramided events, the objective of this study was to evaluate if singular and stacked maize events interfere with the quantity and quality of S. frugiperda egg masses
In tests where the moth was exposed to only one non-injured material, Bt and non-Bt hybrids influenced the egg masses deposition (Fig. 1A; F=3.85, GL=4, P

Summary

Introduction

INFLUÊNCIA DO MILHO TRANSGÊNICO NO COMPORTAMENTO DE FÊMEAS ADULTAS DE Spodoptera frugiperda Foram observadas massas de ovos de maior tamanho e maior número de lagartas eclodidas por planta. For example, feeding is not the first contact between plants and herbivores (Refsnider & Janzen, 2010) but rather oviposition (Hilker & Meiners, 2006). Females use chemical receptors that detect odors released by the plant, which are used for feeding and oviposition, besides being useful to detect the presence of conspecifics (Hilker & Meiners, 2006). E. Smith) (Lepidoptera: Noctuidae) is a cosmopolitan and phytophagous insect species, native to tropical and subtropical regions of the Americas, where it is widely distributed (Cruz, 1995), and more recently, in Africa and Asia (Montezano et al, 2018). The use of transgenic crops, such as those that produce insecticidal proteins from the bacterium

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Results