Insecticide Selectivity for Doru lineare (Dermaptera: Forficulidae)

C.S Stecca,M.D Denez,D.M Silva,A.F Bueno,M.A.M Mantovani,A Pasini

doi:10.18512/1980-6477/rbms.v13n1p107-115

Abstract

This study aimed at assessing selectivity of insecticides to adults of Doru lineare . The tests were performed under controlled environmental conditions. Insecticides tested (g a.i. ha -1 ) were: flubendiamide (72); chlorantraniliprole (30); chlorantraniliprole (15) + lambda-cyhalothrin (7.5); lambda-cyhalothrin (7.5); chlorpyriphos (480); and control (distilled water). Treatments were sprayed over arenas made up with glass plates (area 169 cm 2 ), imprisoning the insect with PVC rings. The top of the rings was protected with a fine fabric (tulle) where adult insects were sprayed with insecticides using a Potter Tower. Insect survival was assessed at 24, 48, 72, 96, and 120 h after exposing adults to the treatments. Flubendiamide and chlorantraniliprole were classified as harmless (class 1) to D. lineare and therefore apropriated to be used in Integrated Pest Management (IPM) programs since they can be sprayed preserving natural biological control. Chlorpyriphos, lambda-cyhalothrin and the mixture of chlorantraniliprole + lambda-cyhalothrin were harmful (class 4), moderately harmful (class 3), and slightly harmful (class 2), respectively. Non-selective products should also be tested in semi-field and field conditions to evaluate its persistence. Whenever possible, noxious and persistent insecticides should be replaced for more selective ones.

Highlights

RESUMO - Este trabalho avaliou a seletividade de inseticidas a adultos de Doru lineare
Considering the need of using more selective products for preserving beneficial insects, this study had the objective of assessing the selectivity of different insecticides on adults of the predator D. lineare
The combination of chlorantraniliprole + lambda-cyhalothrin, was classified as slightly harmful. This probably happened due to lower selectivity of this combination in relation to treatment with chlorantraniliprole tested alone, once it has been mixed with a product belonging to the pyrethroid group that usually are less selective to natural enemies (Carmo et al, 2010) (Table 1). As it can be noticed within this study, when these molecules were tested separately, the insecticide chlorantraniliprole was harmless to the predator D. lineare, while the insecticide lambda-cyhalothrin was moderately harmful

Summary

Introduction

RESUMO - Este trabalho avaliou a seletividade de inseticidas a adultos de Doru lineare. Considering the need of using more selective products for preserving beneficial insects, this study had the objective of assessing the selectivity of different insecticides on adults of the predator D. lineare. This result was already expected since this treatment has been previously classified as harmful to different beneficial arthropods and used as positive control treatment (non-selective pesticide) (Carmo et al, 2010; Campos et al, 2011).

Objectives

Results

Conclusion