Insecticidal activity of Maytenus species (Celastraceae) nortriterpene quinone methides against codling moth, Cydia pomonella (L.) (Lepidoptera: tortricidae) |
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Authors: | Avilla J Teixidò A Velázquez C Alvarenga N Ferro E Canela R |
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Institution: | Area de Protecció de Conreus, Centre UdL-IRTA de R+D de Lleida, Departament de Producció Vegetal i Ciència Forestal, and Department de Química, Universitat de Lleida, Rovira Roure 177, 25198 Lleida, Spain. avilla@lleida.irta.es |
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Abstract: | The insecticidal effects of nortriterpene quinone methides (pristimerin, tingenonee, and 20-alpha-hydroxytingenone) are reported for the first time. The natural products were isolated from Maytenus sp. (Celastraceae) and their effects tested on larvae of codling moth (Cydia pomonella, Lepidoptera: Tortricidae). The three metabolites produce the same effects on codling moth larvae that azadirachtin does, although at higher concentrations. 20-alpha-Hydroxytingenone was the most active compound, showing lethal, antifeedant, and insect growth regulation activities. Pristimerin showed also a high antifeedant activity together with its molt effect suppression. Tingenone showed the lowest activity. The differences in the activity of the three products are related to the structure of the E ring. |
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