Bragantia (2005) 64, 633-641

Cesar Augusto Manfré Medeiros and Arlindo Leal Boiça Júnior (2005)
Efeito da aplicação de extratos aquosos em couve na alimentação de largatas de Ascia monuste orseis
[Effect of aqueous vegetal extratcts application on larva feeding behavior of Ascia monuste orseis on kale]
Bragantia 64 (4), 633-641
Abstract: The 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 ± 2ºC 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 choice of leaves without extracts, consumption was performed with no difference among treated leaves, in all tested concentrations, however they consumed a lesser amount. The extracts tested in this experiment demonstrated effect on the feeding of the caterpillars of A. monuste orseis, possibly with deterrents properties and/or feeding suppressors.

Os 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. Avaliou-se a atratividade e o consumo de área foliar de lagartas de primeiro e terceiro ínstar durante 24 horas, em condições de laboratório (T = 25 ± 2ºC, 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ascia monuste	Cabbage (Brassica oleracea)