Effects of plant extracts on developmental stages of the predator Podisus nigrispinus (Hemiptera: Pentatomidae)
Keywords:
alternative control, natural insecticide, predatory bugAbstract
The aim of this study was to evaluate the toxicity of aqueous extracts of Annona squamosa L. (Magnoliales: Annonaceae), Azadirachta indica A. Juss (Sapindales: Meliaceae), Corymbia citriodora Hook. (Myrtales: Myrtaceae), Cymbopogon winterianus Jowitt ex Bor (Poales: Poaceae), Lippia sidoides Cham. (Lamiales: Verbenaceae), Mentha arvensis L. (Lamiales: Lamiaceae), Ricinus communis L. (Malpighiales: Euphorbiaceae), and Sapindus saponaria L. (Sapindales: Sapindaceae) on the developmental stages (eggs, 5th instars, and adults) of a generalist predator Podisus nigrispinus (Dallas) (Hemiptera: Pentatomidae). The eggs were dipped in extract concentrations of 0, 1, 3, 5, 7, and 10%, and the nymphs and adults received 1 μL of each extract on the dorsal thorax. The extracts affected hatching, with the extracts of A. indica (flowers), A. squamosa, and R. communis being the most toxic. None of the extracts affected the mortality in the nymphal stage, whereas S. saponaria, A. indica (flowers), and L. sidoides extracts caused relatively high mortality rates in adults. Due to the insecticidal effect of these extracts, they need to be used with care because they affect the life cycle of the predator P. nigrispinus.
Sumário
O objetivo desse estudo foi avaliar a toxicidade dos extratos aquosos da Annona squamosa L. (Magnoliales: Annonaceae), Azadirachta indica A. Juss (Sapindales: Meliaceae), Corymbia citriodora Hook. (Myrtales: Myrtaceae), Cymbopogon winterianus Jowitt ex Bor (Poales: Poaceae), Lippia sidoides Cham. (Lamiales: Verbenaceae), Mentha arvensis L. (Lamiales: Lamiaceae), Ricinus communis L. (Malpighiales: Euphorbiaceae), e Sapindus saponaria L. (Sapindales: Sapindaceae) nos estágios de desenvolvimento (ovos, quinto instar e adultos) do predador generalista Podisus nigrispinus (Dallas) (Hemiptera: Pentatomidae). Os ovos foram imergidos em extratos com concentrações de 0, 1, 3, 5, 7 e 10%, ninfas e adultos do predador receberam 1 μl de cada extrato na área dorsal. Os extratos de A. indica (flores), A. squamosa e R. communis afetaram a eclosão de ninfas. Nenhum dos extratos avaliados afetou a mortalidade nas ninfas, porém os extratos de S. saponaria, A. indica (flores) e L. sidoides causaram alta mortalidade aos adultos. Apesar desses extratos possuirem ação inseticidas, eles devem ser utilizados com cuidado, pois podem afetar o ciclo de vida do predador P. nigrispinus.
Downloads
Additional Files
Published
Issue
Section
License
Copyright for any article published in Florida Entomologist is held by the author(s) of the article. Florida Entomologist is an open access journal. Florida Entomologist follows terms of the Creative Commons, Attribution Non-Commercial License (cc by-nc). By submitting and publishing articles in Florida Entomologist, authors grant the FOJ and Florida Entomologist's host institutions permission to make the article available through Internet posting and electronic dissemination, and to otherwise archive the information contained both electronically and in a hard printed version. When used, information and images obtained from articles must be referenced and cited appropriately. Articles may be reproduced for personal, educational, or archival purposes, or any non-commercial use. Permission should be sought from the author(s) for multiple, non-commercial reproduction. Written permission from the author(s) is required for any commercial reproduction.