First Report and Population Changes of Bradysia Difformis (Diptera: Sciaridae) on Eucalyptus Nurseries in Brazil
Abstract
The clonal propagation of Eucalyptus in plastic tube containers with growing media substrate without direct contact of seedlings with soil floor in nurseries, changed the status of insects such as fungus gnats (Diptera: Sciaridae), especially the genus Bradysia. This study monitored populations of adults within a Eucalyptus spp. tree nursery in the municipality of Bom Despacho, Minas Gerais State, Brazil. Adult samples were collected monthly, during seven months with 58 yellow sticker card traps, including 21 in a mini garden, 16 in a greenhouse, and 21 in a shaded house. All individuals collected were identified as Bradysia difformis Frey, 1948 (= Bradysia paupera Tuomikoski, 1960) (Diptera: Sciaridae). The population dynamics of B. difformis were not correlated with environmental variables (temperature and relative humidity), but varied between the three sectors of the nursery. This work is the first report associated with the population dynamics of B. difformis of nursery seedlings of Eucalyptus spp. in Brazil.Resumen: A propagação clonal de Eucalyptus em casa de vegetação, em tubetes plásticos com substrato e sem o contato direto das mudas com o solo, mudou o status de insetos como as moscasde- viveiro (Diptera: Sciaridae), especialmente o gênero Bradysia. Este estudo monitorou adultos deste gênero em viveiro de plantas de Eucalyptus, no município de Bom Despacho, Minas Gerais, Brasil. Adultos foram amostrados, durante sete meses com 58 armadilhas amarelas de cola, incluindo 21 em mini-jardim clonal, 16 em casa de vegetação, e 21 em casa de sombra. Todos os indivíduos coletados foram identificados como Bradysia difformis Frey, 1948 (= Bradysia paupera Tuomikoski, 1960) (Diptera: Sciaridae). A dinâmica populacional de B. difformis não se correlacionou com as variáveis climáticas (temperatura e umidade relativa), mas variou entre os três setores do viveiro. Este trabalho é a primeiro relato de ocorrência associada com a dinâmica populacional de B. difformis em viveiro de mudas de Eucalyptus spp. no Brasil.
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