Efeito de pós de origem vegetal sobre Acanthoscelides obtectus (Say) (Coleoptera: Bruchidae) em feijão armazenado

Abstract

Effect of Powders from Vegetal Species on Acanthoscelides obtectus (Say) (Coleoptera: Bruchidae) in Stored Bean ABSTRACT-The evaluation of the bioactivity of powders from 18 plant species on Acanthoscelides obtectus (Say) was performed considering the effect of these materials on the insect behavior and survival. The proportion of 0.3 g of powder per 10 g of bean grains was used in all experiments. The repellent activity of each powder was evaluated by using arenas with five circular plastic boxes, being the central box linked to the others with plastic tubes, in the diagonal disposition where adult insects could choose boxes containing treated or not treated grains. The number of insects in each recipient was counted after 24h. Insecticidal activity was determined by maintaining 1-day old adults in plastic boxes containing bean grains mixed with powder from each plant. Boxes containing only beans were used as control. Five days after infestation, the number of dead insects and the number of total and fertile eggs were determined. The most efficient treatment was the powder from the aerial part of Chenopodium ambrosioides d. (derivation) 2 that caused repellence, total adult mortality and no oviposition, followed by rinds of fruits of Citrus sinensis (cv. Pera) and leaves of Lafoensia glyptocarpa. Leaves of Coriandrum sativum were non repellent but caused total adult mortality and no oviposition. Powders from aerial part of C. ambrosioides d.1, from leaves of Eucalyptus citriodora, Mentha pulegium, Ocimum basilicum, O. minimum and Ruta graveolens, from rinds of fruits of Citrus reticulata (cv. Murcote) and from fruits of Melia azedarach and L. glyptocarpa were repellent too.

Larvicidal Activity of Essential Oils From Brazilian Croton Species Against Aedes Aegypti L

“…The percentage of repellency was calculated as proposed by Mazzonetto & Vendramin (2003): RI = (2 × T) ÷ (T + C) × 100, where RI = repellency index, C = number of insects in the untreated container, and T = number of insects in the treated container. The RI values ranged between 0 and 2, which denoted the following: RI = 1, neutral activity; RI > 1, attraction; and RI < 1, repellency.…”

“…Plant powders of S. occidentalis caused significant mortality in C. maculatus (Adesina et al 2011), and insecticidal properties of A. pyrifolium (Torres et al 2006), C. sonderianus Lima et al 2006Lima et al , 2013, A. cearensis (Farias et al 2010;Souza et al 2011), and Z. joazeiro (Souza et al 2011) have been documented in different insect species. The repellent activities of Caatinga plant powders need further study although the repellency of many other plant powders against stored pests has been reported (Elhag 2000;Kéita et al 2001;Mazzonetto & Vendramin 2003;Silva-Aguayo et al 2005;Sanon et al 2006;Kabir & Muhammad 2010).…”

Insecticide activity of clove essential oil on bean weevil and maize weevil

“…One alternative to the conventional control is the use of plants with insecticide properties, whose parts can be prepared and applied as powders, extracts and oils. These products have the advantages of low cost, easy acquisition and use, their application does not require qualified personnel and they do not have impacts on human health and the environment (Hernández & Vendramim, 1997;Mazzonetto & Vendramim, 2003).…”

Atividade repelente e inseticida do óleo essencial de carqueja doce sobre o caruncho do feijão

“…Os resultados corroboram com os obtidos por Restello et al (2009) que, avaliando a atividade inseticida de Tagetes patula sobre Sitophilus zeamais, nas concentrações de 0, 5, 10, 20, 30 e 50 μL por placa de Petri, concluíram que nas maiores concentrações do óleo essencial (30 e 50 μL) a mortalidade dos insetos foi de 100%, reduzindo para as menores concentrações. Mazzonetto & Vendramim (2003), com o objetivo de verificar o efeito inseticida dos pós de 18 espécies vegetais em relação à Acanthoscelides obtectus (Say), na proporção 0,3 g de pó de cada espécie vegetal para 10 g de feijão, também concluíram que os pós de C. ambrosioides e de C. sativum são altamente tóxicos aos adultos, causando 100% de mortalidade até o quinto dia de contato com os insetos. Do mesmo modo Karabörklü et al (2010) avaliaram a atividade inseticida do óleo essencial de diversas plantas sobre A. obtectus e constataram uma relação inversa entre a dose aplicada e a longevidade.…”

“…O emprego de plantas inseticidas favorece especialmente o pequeno produtor, pelo menor custo, facilidade de utilização, não exigindo pessoal qualificado e pelo fato de não afetar o meio ambiente. Além disto, as plantas podem ser cultivadas na propriedade, facilitando sua utilização (Mazzonetto & Vendramim, 2003).…”