Potencial inseticida de óleos de origem vegetal sobre Grapholita molesta (Busck) (Lepidoptera: Tortricidae)

Abstract

Palavras-chave: Rosaceae, mariposa-oriental, controle, terpenóidesABSTRACT: Insecticidal potential of vegetable oil extracts on Grapholita molesta (Busck) (Lepidoptera: Tortricidae). As a result of the study on the chemical interactions between insects and herbivores and the advancement of phytochemical research studies, a variety of natural products with great insecticidal potential are described in the literature. The Grapholita molesta (Busck) (Lepidoptera: Tortricidae), commonly known as Oriental Fruit Moth, is a major peach pest damaging shoots and fruits. The purpose of this study was to assess the mortality, attractiveness and deterrence of vegetable oils in G. molesta. Insect eggs and pupae artificially created were immersed in the essential oils of Elionurus muticus (Spreng.) Kuntze and/or Cymbopogon winterianus Jowitt ex Bor at the concentrations of 0.25%, 0.5%, 1% and 0.5%, 1%, 5%, respectively. The attractiveness tests were performed in a Y-Tube olfactometer. Oviposition deterrence was tested in no-choice and dual-choice cages. Oil of E. muticus applied in eggs of G. molesta at three concentrations caused mortality above 30%, which differs significantly from controls (p≤0.05). Mortality caused by citronella oil was approximately 70%, significantly higher than control (p≤0.01). The application of citronella oil at 1% in pupae caused mortality of 99.8%. There was no attractiveness of adults in the olfactometer test for any of the oils. Citronella oil presented oviposition deterrence, as the mean number of eggs in the substrate with the treatment (0.33 ± 0.33) is significantly lower than in the control (7.3 ± 0.88) (p≤0.01).

Mortality Assessment of Botanical Oils on Anastrepha fraterculus (Wiedemann, 1830) Applied in Fruits Under Laboratory Conditions

“…These authors mentioned that the odors released by the oils can negatively affect females at the time of oviposition. In addition, the ovicidal and larvicidal effect of citronella oil was also reported by Colpo, Jahnke, and Füller (2014) in a laboratory study with Grapholita molesta (Lepidoptera: Tortricidae).…”

Cinética De Decaimento De Patógenos Entéricos Em Farinha De Carne E Osso Sob Condições Subtropicais De Temperatura

“…Esta diversidade de atuação deve-se à gama de substâncias químicas encontradas em sua composição. A administração dessas substâncias pode ser feita por fumigação, como ocorre em muitos insetos de grãos armazenados, por ingestão e absorção pelo tegumento, a exemplo de lepidópteros, coleópteros entre outros insetos-praga (LIMA & CARDOSO 2007, COLPO et al, 2014.…”

Óleos essenciais de manjericão e capim citronela no controle de larvas de Aedes aegypti

“…Segundo os mesmos autores o óleo de capim citronela pode ser usado para controlar insetos vetores em áreas endêmicas sem prejudicar o meio ambiente e que o controle de larvas é mais eficiente do que o de insetos adultos. Colpo et al (2014) avaliaram o efeito inseticida do óleo essencial do capim citronela sobre Grapholita molesta. Estes autores concluíram que o óleo essencial do capim citronela tem potencial para o controle de G. molesta nas fases de ovo, pupa e adulto, as quais, em campo, são as que ficam mais expostas à ação dos produtos.…”