RESUMO
This study investigated the natural parasitism of Mythimna sequax Franclemont, 1951, in wheat during the crop season of 2008. In total, 237 larvae were captured, of which 10.12% were parasitized. The Tachinidae species Winthemia trinitatis (Thompson, 1963), Winthemia tricolor (Wulp, 1890), Lespesia aletiae (Riley, 1879), and Lespesia archippivora Beneway, 1963 are reported for the first time parasitizing the wheat armyworm in Brazil. In addition, two other genus of parasitoids were identified, one Tachinidae Peleteria Robineau-Desvoidy, 1830 and one Ichneumonidae Ophion (Fabricius, 1798). This study reported for the first time four Tachinidae species parasitizing W. sequax, and further studies are needed to promote the conservation of these parasitoids in agroecossystem and development biological control programs for management of the wheat armyworm.
Este estudo investigou o parasitismo natural de Mythimna sequax Franclemont, 1951, em uma lavoura de trigo, durante a safra 2008. No total, foram capturadas 237 lagartas, registrando-se um parasitismo de 10,12%. As espécies de taquinídeos Winthemia trinitatis (Thompson, 1963), Winthemia tricolor (Wulp, 1890), Lespesia aletiae (Riley, 1879) e Lespesia archippivora (Beneway, 1963) são registrados pela primeira vez parasitando a lagarta-do-trigo no Brasil. Adicionalmente, dois gêneros de parasitoides foram identificados, um taquinídeo Peleteria sp. (Robineau-Desvoidy, 1830) e um ichneumonídeo Ophion sp. (Fabricius, 1798). Este estudo registra pela primeira vez a ocorrência de quatro espécies de parasitoides em M. sequax no Brasil, e estudos adicionais são necessários para promover a conservação desses parasitoides no agroecossistema, assim como o desenvolvimento de programas de controle biológico para o manejo da lagarta-do-trigo.
Assuntos
Controle Biológico de Vetores , Doenças das Plantas , Pragas da Agricultura , Triticum/parasitologiaRESUMO
This study investigated the natural parasitism of Mythimna sequax Franclemont, 1951, in wheat during the crop season of 2008. In total, 237 larvae were captured, of which 10.12% were parasitized. The Tachinidae species Winthemia trinitatis (Thompson, 1963), Winthemia tricolor (Wulp, 1890), Lespesia aletiae (Riley, 1879), and Lespesia archippivora Beneway, 1963 are reported for the first time parasitizing the wheat armyworm in Brazil. In addition, two other genus of parasitoids were identified, one Tachinidae Peleteria Robineau-Desvoidy, 1830 and one Ichneumonidae Ophion (Fabricius, 1798). This study reported for the first time four Tachinidae species parasitizing W. sequax, and further studies are needed to promote the conservation of these parasitoids in agroecossystem and development biological control programs for management of the wheat armyworm.(AU)
Este estudo investigou o parasitismo natural de Mythimna sequax Franclemont, 1951, em uma lavoura de trigo, durante a safra 2008. No total, foram capturadas 237 lagartas, registrando-se um parasitismo de 10,12%. As espécies de taquinídeos Winthemia trinitatis (Thompson, 1963), Winthemia tricolor (Wulp, 1890), Lespesia aletiae (Riley, 1879) e Lespesia archippivora (Beneway, 1963) são registrados pela primeira vez parasitando a lagarta-do-trigo no Brasil. Adicionalmente, dois gêneros de parasitoides foram identificados, um taquinídeo Peleteria sp. (Robineau-Desvoidy, 1830) e um ichneumonídeo Ophion sp. (Fabricius, 1798). Este estudo registra pela primeira vez a ocorrência de quatro espécies de parasitoides em M. sequax no Brasil, e estudos adicionais são necessários para promover a conservação desses parasitoides no agroecossistema, assim como o desenvolvimento de programas de controle biológico para o manejo da lagarta-do-trigo.(AU)
Assuntos
Triticum/parasitologia , Doenças das Plantas , Pragas da Agricultura , Controle Biológico de VetoresRESUMO
Aphid parasitoids are common in Brazilian wheat fields, and parasitize aphids at the wheat tillering stage. However, there is little information available about when this natural enemy occurs in wheat crops. This study investigated the initial occurrence of aphid parasitoids in four commercial wheat crops in northern Paraná during the 2009 crop season. We installed two Malaise traps at each wheat farm, and 400 tillers were assessed weekly in each field for aphid abundance. During this study, we captured 4,355 aphid parasitoids and 197 aphids. Three species of braconid parasitoids were identified, including Aphidius colemani (Viereck 1912), Lysiphlebus testaceipes (Cresson 1880), and Diaeretiella rapae (McIntosh 1855). The aphids species identified were Rhopalosiphum padi (Linnaeus 1758) and Sitobion avenae (Fabricius 1775). This study showed that aphid parasitoids are present in wheat crops even when aphid densities are low, and in one farm, occurred before the aphids colonization. These reports can justified the high efficiency of these natural enemies against aphids in wheat fields.