Abai, MR

6th International Congress of DipterologyPolyphagous Agromyzidae as pest species in vegetables inVietnamAndersen, A. (1) & A.T.T. Tran (2)(1) Department of Plant and Environmental Sciences, Norwegian University of LifeSciences, Høgskoleveien 7, 1432 Ås, Norway(2) Department of Plant Protection, Nong Lam University, Thu Duc, Ho Chi Minh City,VietnamDuring the last 40 years South-east Asia has been invaded by severalpolyphagous Agromyzidae species from America and Europe. They haveprobably followed international trade with their host plants. Due todifficult taxonomy and lack of local investigations, little has beenpublished about their appearance in this part of the world. To increase ourknowledge, a project has investigated their distribution and biology inVietnam during 2000-2006.In Vietnam today at least five of these invasive species are important pestsin vegetables, potatoes and cotton. The vegetable leafminer, Liriomyzasativae Blanchard is by far the most widespread and common species. It isfound all over the country. The tomato leafminer, L. bryoniae Kaltenbachis found in many vegetable growing areas in most of the country, but notsouth of Hochiminh city. The pea leafminer, L. huidobrensis (Blanchard) isfound mainly at higher elevations in the Lam Dong province, but for thetime being is spreading also to nearby areas at lower altitude fromHochiminh city to Da Nang. The American serpentine leafminer, L. trifoliiBurgess is found spread and local in vegetable growing areas in provincesin the middle part of Vietnam from Hochiminh city to Hue. Chromatomyiahorticola Goureau is found spread in most areas north of Hochiminh city,but in high numbers mainly at higher elevations in the Lam Dong province.All species appear in vegetable fiends all year round, but they are mostnumerous during late winter and early spring, in January – April.Distribution within Vietnam, host plant preferences, life cycle and differentaspects of their biology will be discussed for each of the five species.11