Abai, MR

6th International Congress of DipterologySeasonal prevalence and species composition of Liriomyzasativae Blanchard, L. trifolii (Burgess), and L. bryoniae(Kaltenbach) (Diptera: Agromyzidae) on commerciallygrown tomato plants in Kyoto Prefecture.Tokumaru S. (1) & Y. Abe (2)(1) Kyoto Prefectural Agricultural Research Institute; Kameoka, Kyoto 621-0806, Japan(2) Laboratory of Applied Entomology, Graduate School of Agriculture; KyotoPrefectural University, Kyoto 606-8522, JapanIn Japan, the vegetable leafminer, Liriomyza sativae Blanchard, wasfound for the first time in Okinawa, Yamaguchi, and Kyoto prefectures in1999 (Iwasaki et al., 2000), and it is now distributed in western Japan(Tokumaru et al., 2002; Tokumaru and Abe, 2003). The Americanserpentine leafminer, L. trifolii (Burgess), was found for the first time inJapan in 1990, and has spread rapidly throughout the country (Saito, 1992).In Kyoto Prefecture, this fly was recorded for the first time in 1995 (Saito,1997). The tomato leafminer, L. bryoniae (Katenbach), was known to bean important pest of eggplant, tomato, (Sasakawa, 1966), potato (Harukiand Tomioka, 1962), and melon (Ikeda and Oishi, 1987).From August to December 1999, L. sativae coexisted with L. trifoliiand L. bryoniae on commercially grown tomato plants and these threespecies had different peaks in a greenhouse in Muko City, KyotoPrefecture (Abe and Kawahara, 2001). In the present study, to documentthe relative abundance of the three Liriomyza species after invasion by L.sativae, the seasonal prevalence of L. sativae, L. trifolii, and L. bryoniaeinfesting commercially grown tomato plants was surveyed in twogreenhouses in Kyoto Prefecture from 2000 to 2002.Only L. bryoniae was found from April to July 2000 and 2002, butfrom August to December 2000 and 2002, L. sativae was predominant.Throughout 2001, L. sativae was predominant with a few L. bryoniae. In2001 and 2002, L. trifolii was not found at all. After invasion by L. sativae,L. trifolii population decreased suddenly throughout the year, and L.bryoniae population decreased after August.270