(41(1):61-69)Trapping efficiency of yellow sticky cards for the serpentine leafminer, Liriomyza trifolii (Burgess) on gerbera

黃色黏板（15×20cm）對距離10m外之非洲菊斑潛蠅（Liriomyza trifolii（Burgess））無明顯誘引作用。在一般設施栽植之非洲菊上每畦每隔2m至8m水平放置一塊黃色黏板，於4日內成蟲被誘捕率自11.3％至34.6％，平均誘捕率22.4─26.5％。誘捕率以釋放後第1日最高，1日齡成蟲之被誘捕率可達17.2％，2、3日齡成蟲之被誘捕率分別為9.4％與10.1％。黃色黏板誘得成蟲雌／雄性比值為0.48─0.52，低於正常族群性比值之0.89─1.03。誘得1日齡成蟲之雌雄數目差異最大，雌雄性比值0.37，2日齡為0.58，3、4日齡分別為1.07與1.17。在14─25°C範圍內，日平均溫度之高低與誘捕率間無明顯相關。 Yellow sticky cards did not show the attractant effect on flies of Liriomyza trifolii (Burgess) from l0m away. The average numbers of flies/card were statistically the same when cards were placed on rows of gerberas at 2m, 4m or 8m intervals in pipehouses for 24 hours, and the number of flies trapped in each pipehouse was proportional to the number of sticky cards placed. In an enclosed pipehouse, yellow sticky cards (15×20cm) placed horizonally on each gerbera planting row at 2m intervals could trap from 11.3% to 34.6% in average of 22.4-26.5% of the flies within 4 days of releasing. The trap was more attractant to the 1-day-flies than the older ones. As the newly emerged flies were released on pipehouse gerberas, about 17.2%, 9.4%, 10.1% of the living 1, 2, 3 days old flies were trapped, respectively. The female/male sex ratio of flies on cards was 0.48-0.52; while it of flies emerged from field-collected larvae and insectary-reared larvae were 0.89 and 1.03, respectively. Difference in sex ratio was more pronounced for the newly released young flies than several days old flies. The sex ratio of 1 day old flies was 0.37, of 2 days old flies was 0.58, of 3 and 4 days old flies were 1.07 and 1.17, respectively. The trapping efficiency was not affected by daily average temperatures ranged from 14 to 25C