%0 Journal Article
%T Chrysoperla externa (Neuroptera: Chrysopidae) and Utetheisa ornatrix (Lepidoptera: Arctiidae) on organically grown Crotalaria juncea (Fabaceae) Chrysoperla externa (Neuroptera: Chrysopidae) e Utetheisa ornatrix (Lepidoptera: Arctiidae) sobre Crotalaria juncea (Fabaceae) cultivada organicamente
%A M.A. Costa
%A W.S. Tavares
%A A.I.A. Pereira
%A I. Cruz
%J Planta Daninha
%D 2012
%I Sociedade Brasileira da Ci那ncia das Plantas Daninhas
%R 10.1590/s0100-83582012000300001
%X Chrysoperla externa (Neuroptera: Chrysopidae) larvae can avoid foraging on plants of Crotalaria juncea (Fabaceae) after the issuance of floral buds, when the prey of Utetheisa ornatrix (Lepidoptera: Arctiidae) incorporate toxic pyrrolizidine alkaloids from this plant. This reduces the predation and favors increasing the number of adults and eggs of this defoliator on crops of this plant. The aim of the present paper was to evaluate some biological and ecological aspects of C. externa and U. ornatrix on the organic crop of C. juncea in the EMBRAPA Maize and Sorghum in Sete Lagoas, Minas Gerais State, Brazil. Chrysoperla externa and U. ornatrix were more abundant in the vegetative and flowering stages of C. juncea, respectively, with caterpillars of this defoliator feeding on leaves and seeds of this plant. The duration of the stages/instars, survival, lifetime fecundity, and oviposition showed that the branches of C. juncea are a suitable food for U. ornatrix. The abundance of adults and larvae of C. externa was lower in the flowering and pods stages of C. juncea, respectively, when the postures of U. ornatrix are present, probably due to the toxicity of the eggs of this prey to this predator. During these stages, C. externa may be reared with alternative hosts, and when the crops of C. juncea are scarce, an artificial diet should be used for rearing this defoliator in the laboratory for biological research and the development of biological control tactics. Larvas de Chrysoperla externa (Neuroptera: Chrysopidae) podem evitar o forrageamento sobre plantas de Crotalaria juncea (Fabaceae) ap車s a emiss o de bot es florais, quando presas de Utetheisa ornatrix (Lepidoptera: Arctiidae) incorporam alcal車ides pirrolizid赤nicos t車xicos dessa planta. Isso reduz a preda  o e favorece o aumento do n迆mero de adultos e ovos desse desfolhador sobre cultivos dessa planta. O objetivo deste trabalho foi avaliar alguns aspectos biol車gicos e ecol車gicos de C. externa e U. ornatrix sobre cultivo organico de C. juncea na EMBRAPA Milho e Sorgo, em Sete Lagoas, Minas Gerais, Brasil. Chrysoperla externa e U. ornatrix foram mais abundantes nos est芍dios vegetativo e de florescimento de C. juncea, respectivamente, com lagartas desse desfolhador se alimentando sobre folhas e sementes dessa planta. A dura  o dos est芍gios/est芍dios, sobreviv那ncia, fecundidade de vida e oviposi  o mostraram que ramos de C. juncea 谷 um alimento adequado para U. ornatrix. A abundancia de adultos e larvas de C. externa foi menor nas fases de flora  o e vagens de C. juncea, respectivamente, quando posturas de
%K controle biol車gico
%K lagarta-das-crotal芍rias
%K crisop赤deo
%K aduba  o verde
%K Manejo Integrado de Pragas
%K biological control
%K crotalaria month
%K green lacewing
%K green manure
%K Integrated Pest Management
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000300001