Efeito da aplicação de extratos aquosos em couve na alimentação de largatas de Ascia monuste orseis

Abstract

RESUMOOs efeitos de extratos aquosos de amêndoas de Azadirachta indica e frutos de Sapindus saponaria, aplicados em discos de folhas de couve (Brassica oleracea var. acephala) nas concentrações de 0,0117% e 1,0342% (p/v), respectivamente, foram estudados sobre a alimentação das lagartas de Ascia monuste orseis. Avaliouse a atratividade e o consumo de área foliar de lagartas de primeiro e terceiro ínstar durante 24 horas, em condições de laboratório (T = 25 ± 2 o C, UR = 60 ± 10% e fotofase = 12 horas). Nos testes com e sem chance de escolha, para lagartas de primeiro ínstar e teste sem chance de escolha para lagartas de terceiro ínstar, não houve diferença quanto à atratividade das lagartas. No teste com chance de escolha para lagartas de terceiro ínstar, houve menor atratividade das lagartas pelos discos de folhas tratadas com S. saponaria, diferindo da testemunha. No decorrer de 24 horas de avaliações, pode-se observar 58,3% de lagartas atraídas na testemunha, não diferindo de A. indica e diferindo de S. saponaria, com 39,3% e 2,4% das lagartas atraídas, respectivamente. Quanto ao consumo de área foliar, o extrato de S. saponaria diminuiu o consumo de lagartas, em todos os testes realizados. Quando não tinham opção de escolha para se alimentar de folhas sem os extratos, as lagartas consumiram as folhas tratadas nas concentrações testadas, porém em menor quantidade. Os extratos testados neste experimento demonstram ter efeitos sobre a alimentação das lagartas de A. monuste orseis, possivelmente com propriedades deterrentes e/ou supressoras de alimentação.Palavras-chave: Insecta, Pieridae, planta inseticida, nim, Brassica oleracea var. acephala. ABSTRACT EFFECT OF AQUEOUS VEGETAL EXTRACTS APPLICATION ON LARVAL FEEDING BEHAVIOR OF ASCIA MONUSTE ORSEIS AT KALEThe effects of aqueous extracts of Azadirachta indica almonds and of Sapindus saponaria fruits, applied on disks of kale leaves (Brassica oleracea var. acephala) at concentrations of 0.0117% and 1.0342% (w/v), respectively, were studied on larval feeding behavior of Ascia monuste orseis. Data on leaves attractiveness and consumption at first and third larval instar were taken during 24 hours (25 ± 2 o C temperature, 60 ± 10% RH and 12 photophase). There was not difference in relation to attractiveness of caterpillars at first instar in tests with and without choice as well as caterpillar at third instar in tests without possibility of choice. In the test with possibility of choice for caterpillars of third instar had lesser attractiveness of the caterpillars for disks leaf treated with S. saponaria, differing to the control. During 24 hours of evaluations 58.3% of caterpillars were attracted to the control treatment which, did not differed to the 39.3% of A. indica treated disks. However, the treatments with S. saponaria, showed a 2.4% of the caterpillars attracted by observation, which was a significant difference. In addition, S. saponaria reduced the consumption of leaves by caterpillars in all the carried tests. When the caterpillars did not have feeding ...

Phytochemical profile of cansanção nettle extracts and their bioactivities on cabbage caterpillar

“…The feeding reduction of A. monuste orseis was also reported in another study on the effect of the aqueous extracts of A. indica and S. saponaria on food preference (Medeiros & Boiça-Júnior, 2005). Even when caterpillars were not offered any choice, they continued to feed on treated leaves, but to a lesser degree, which evidences that the extracts negatively affected feeding.…”

“…Sapindus saponaria fruit extracts, at 0.0117% and 1.0342% (m/v) concentrations, induced a decrease of up to 84.4% of cabbage leaf consumption by A. monuste orseis (Medeiros & Boiça-Júnior, 2005); these authors suggested that this reduction was probably a result of the deterrent properties of the extracts.…”

Effects of cowpea cultivars and neem oil on attractiveness, feeding, and development of Spodoptera eridania (Cramer) (Lepidoptera: Noctuidae)

“…NS = not significant; ** = significant at 1%. Medeiros & Boiça Júnior (2005) reported that when there is no option to choose among untreated leaves, larvae may consume leaves treated with different concentrations of botanical insecticides, however with lower consumption, hence reducing the injury caused to the plants. There were no significant differences among the cowpea cultivars and doses of neem oil on attractiveness to S. eridania larvae and leaf area consumed in the free-choice and no-choice tests (Tables 1, 2 and 3).…”

Potencial inseticida de caldas agroecológicas no controle do curuquerê da couve, Ascia monuste orseis (Lepidoptera: Pieridae)

“…Os insetos são um dos fatores que causam grandes perdas na produção de Brassicaceae, e dentre eles, se destaca como praga chave a lagarta Ascia monuste orseis (Lepidoptera: Pieridae), um inseto desfolhador, que pode causar perdas significativas de até 100% da cultura da couve (Baldin et al, 2015;Medeiros & Junior, 2005;Pereira et al, 2003).…”