Toxicity of new pyrethroid in pest insects Asciamonuste and Diaphania hyalinata,predator Solenopsis saevissima and stingless bee Tetragonisca angustula |
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| Authors: | Shaiene C Moreno Flaviano O Silvério Mayara C Lopes Rodrigo S Ramos Marcelo C Picanço |
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| Institution: | 1. Federal Institute of Education, Science and Technology of Rio de Janeiro, Pinheiral, RJ, Brazil;2. Institute of Agrarian Sciences, Universidade Federal de Minas Gerais, Montes Claros, MG, Brazil;3. Department of Phytotechnology, Universidade Federal de Vi?osa, Vi?osa, MG, Brazil;4. Department of Entomology, Vi?osa, MG, Brazil |
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| Abstract: | There is increasing demand for new products for vegetable pest management. Thus, the aim of this study was to assess the toxicity of pyrethroids with acid moiety modifications to measure the insecticidal activity of these compounds on the lepidopteran vegetable pests Diaphania hyalinata (L.) (Lepidoptera: Pyralidae) and Asciamonuste (Latreille) (Lepidoptera: Pieridae) and evaluate their selectivity for the predatory ant Solenopsis saevissima (F. Smith) (Hymenoptera: Formicidae) and pollinator Tetragonisca angustula (Latreille) (Hymenoptera: Apidae: Meliponinae). Racemic mixtures of five new pyrethroids (30 µg molecule mg?1 insect body weight) resulted in high (100%) and rapid (stable LD50 after 12 h) mortality in D. hyalinata and A. monuste. In A. monuste, the trans-pyrethroid 12] isomer showed similar toxicity to permethrin. For D. hyalinata, the trans-pyrethroid 9] isomer and cis-pyrethroid 10] isomer were as toxic as permethrin. Due to their low selectivity, these new pyrethroids should be applied on the basis of ecological selectivity principles to minimize impacts on nontarget organisms S. saevissima and T. angustula. |
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| Keywords: | Chemical control new molecules selectivity nontarget organisms insecticide synthesis Cucurbitaceae Brassicaceae |
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