Dispersion patterns of Diachasmimorpha longicaudata (Hymenoptera: Braconidae) in citrus orchards in southeast Brazil

We studied the dispersion patterns of the exotic endoparasitoid, Diachasmimorpha longicaudata (Ahsmed) (Hymenoptera: Braconidae), in 1999 (summer) and in 2000 (winter) in a citrus orchard in southeast Brazil. Different population densities of D. longicaudata were released in the centre of the orchar...

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Bibliographic Details
Published in:Biocontrol science and technology 2007-01, Vol.17 (3-4), p.375-385
Main Authors: Paranhos, B.A.J, Mendes, P.C.D, Papadopoulos, N.T, Walder, J.M.M
Format: Article
Language:English
Subjects:
biological control
biological control agents
Braconidae
Citrus
citrus fruits
density
Diachasmimorpha longicaudata
Dispersal behavior
fruit flies
height
Hymenoptera
orchards
parasitoid
parasitoids
plant pests
population density
release
seasonal variation
spatial distribution
Tephritidae
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Summary:We studied the dispersion patterns of the exotic endoparasitoid, Diachasmimorpha longicaudata (Ahsmed) (Hymenoptera: Braconidae), in 1999 (summer) and in 2000 (winter) in a citrus orchard in southeast Brazil. Different population densities of D. longicaudata were released in the centre of the orchard, and their dispersion was determined by using yellow, sticky, rectangular traps, placed in various distances and heights around the release point. Our results suggest that during summer, climatic conditions did not affect dispersion. However, in winter, dispersion rates were positively affected by temperature, and negatively by rainfall. Both estimated dispersal distance and surface were higher in summer than in winter for all release densities. Dispersion peaked at 2000 parasitoids ha(-1) in summer and 8000 parasitoids ha(-1) in winter. The importance of our results for the biological control of fruit flies by augmented or innoculative releases of D. longicaudata in southeast Brazil is discussed.
ISSN:0958-3157
1360-0478
DOI:10.1080/09583150701309105