Dípteros predadores do género Coenosia Meigen (Muscidae) em culturas hortícolas...

• Author(s): Mexia, António ; Prieto, R. ; Figueiredo, E. ; Miranda, C.
• Date: 2003
• Persistent ID: http://hdl.handle.net/10400.5/721
• Origin: Repositório da UTL
• Subject(s): coenosia; predatory diptera; greenhouse; diptero predador; cultura protegida
• Document Type: Conference Object
• Language: Portuguese

Description

A dipteran insect, reported by a greenhouse farmer catching in fly adults of whiteflies and leafminers, was identified as being Coenosia attenuata Stein. A search made in the Oeste revealed its presence all over this region. Behaviour studies were carried out having in mind further ones relying its importance evaluation or, eventually, the future quantification of this predator population’s impact on the whitefly and/or leafminer risk assessment. From March to September 2002, one tomato and two sweet pepper crops were analysed on a weekly basis. The number of coenosia in each of three vertical layers and within organ/structure (leaf, stem, fruit, tutor and plastic cover on crop line) was recorded. Yellow chromotropic traps were used to sample the number of adult whiteflies, leafminers and coenosia Statistical analysis of the obtained data showed a prevalence of this predator on the superior crop layer, on the tutor and on the leaf. There was no ground for establishing a dependence relation between the population level of the predator and that of its preys (whiteflies and/or leafminers).