Dípteros minadores e seus parasitóides em plantas de crescimento espontâneo em pomar orgânico de citros em Montenegro, RS, Brasil

Abstract

ABSTRACT. Diptera leafminers and their parasitoids in spontaneous vegetation in organic citrus orchard in Montenegro, RS, Brazil. Leafminers and their parasitoids communities analysis is necessary to supply information about the biotic regulation and to maintenance of the biodiversity in the agroecosystem. This study aimed to register Diptera leafminers and their parasitoids, present in the vegetation spontaneously growing at the citrus orchard from May 2003 to May 2004. The work was conducted in Montenegro, RS, in an organic orchard of the hybrid 'Murcott'. Samplings were taken fortnightly, collecting in each occasion all the plants with mines found in an area delimited by a 0.28 m 2 arc thrown in the lines and between lines of 30 randomly chosen trees. In the lab, the number of larvae and pupae per leaf of Diptera leafminers were recorded. Throughout the study, it was found 15 species of Diptera leafminers, 15 species of leafminer host plants (distributed in six families) and 15 species of micro hymenopterans parasitoids (distributed in three families). It was verified that the Diptera leafminers had presented great specificity to their host plants; therefore, the appropriate management of the spontaneous vegetation of the orchards may favor the establishment and multiplication of natural enemies of these leafminers insects.

Nutrição e genética na ocorrência de pragas, inimigos naturais e ataque de minadoras em feijão comum (Phaseolus vulgaris)

“…Um dos principais inimigos naturais dessa espécie de praga é o parasitóide Opius sp. (Hymenoptera: Braconidae), que controla as larvas, que são os que causam os danos (Santos et al, 2008). Estes parasitóides utilizam as larvas como hospedeiras das suas progênies, ao ovipositar no interior destas, para que a larva do parasitóide possa alimentar-se do conteúdo interno da lagarta, emergindo, posteriormente, um ou mais adultos.…”

Description of three new species ofPhyllocnistisZeller, 1848 (Lepidoptera: Gracillariidae), from theAtlantic Forest, southBrazil, with notes on natural history and phylogeny

“…However, Santos et al . () reported that this species (reported as Phyllocnistis sp.) occurs year around in the area, with higher densities found during the winter and spring.…”