Ação de Inseticidas Botânicos sobre a Preferência Alimentar e sobre Posturas de Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) em Milho

Abstract

Resumo. O presente trabalho objetivou comparar o efeito de diferentes extratos de origem vegetal na preferência alimentar e na postura da lagarta do cartucho Spodoptera frugiperda (J.E. Smith) em folhas de milho. Extratos aquosos a 10% p/v de Chenopodium ambrosioides (Linnaeus) (Erva de Santa Maria), Corymbia citriodora (Hill & Johnson) (Eucalipto Cheiroso), Chrysanthemum leucanthemum (Linnaeus) (Crisântemo) e Azadirachta indica (A. Juss) (Nim) foram aplicados em discos de folhas de milho e oferecidos às lagartas em testes com e sem chance de escolha. A atratividade das lagartas pelos discos com os extratos não diferiu da testemunha no teste com chance de escolha, porém os extratos de Nim e Crisântemo apresentaram efeito fagodeterrente a S. frugiperda. Nos testes sem chance de escolha, o tratamento que mais repeliu as lagartas foi utilizando extrato de Nim, representando possível alternativa para o controle das lagartas desta espécie. Nenhum dos extratos aquosos das espécies vegetais testadas apresentou efeito ovicida.Palavras-chaves: Extratos Vegetais; Lagarta do Cartucho; Zea mays. Action of Botanical Insecticides on the Preference of Food and on Postures of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in MaizeAbstract. This study compares the effect of different extracts of vegetal origin in food preference and posture of the fall armyworm Spodoptera frugiperda (J.E. Smith) in maize leaves. Aqueous extracts 10% w/v of Chenopodium ambrosioides (Linnaeus), Corymbia citriodora (Hill & Johnson), Chrysanthemum leucanthemum (Linnaeus) and Azadirachta indica (A. Juss) were applied to leaf discs of maize and offered to caterpillars tests with and without choice. The attractiveness of the caterpillars for discs with the extracts did not differ from the control test-choice, but extracts of A. indica and C. leucanthemum showed antifeedant activity to S. frugiperda. In no-choice tests, the treatment was more repelled the larvae using A. indica extract, representing possible alternative for the control of caterpillars of this species. None of the aqueous extracts of the plant species tested showed ovicidal effect.

Applying plant oils to control fall armyworm (Spodoptera frugiperda) in corn

“…The results obtained for tea tree (Myrtaceae) oil on the first-and second-instar caterpillars were similar to those observed by Mazzonetto et al (2013). These authors determined the feeding preference of S. frugiperda caterpillars to corn leaves treated with Corymbia citriodora (Myrtaceae) extract and observed that this family does not negatively interfere with the feeding activity of those insects, compared with the control.…”

Toxicity of soursop extracts to diamondback moth

“…However, the same author mentions that plants with insecticidal activity cause low or no effect on eggs. This can be seen in a experiment with the different aqueous extracts of 10% Chenopodium ambrosioides (Linnaeus) (Amaranthaceae), Corymbia citriodora (Hill & Johnson) (Mrytaceae), Chrysanthemum leucanthemum (Linnaeus) (Asteraceae) and A. indica on the percentage of hatched larvae of S. frugiperda, that showed no ovicidal action (MAZZONETTO et al, 2013). Torres et al (2006) obtained similar data in embryonary stage of P. xylostella when eggs were submitted to three plant extracts in lethal and sublethal concentrations.…”

Assessing potential plants extracts to reduce Leucoptera coffeella (lepidoptera: Lyonetiidae) attack in coffee

“…Insecticidal activity on the embryonic phase of lepidopterans by botanical extracts is not widely known, especially the ovicidal action (Mazzonetto et al, 2013). The effect ovicidal of the extracts tested in this study is interesting due to ovicidal activity of synthetic and botanic products is not conventional (Martinez;Meneguim, 2003).…”