台灣鋏蠓 Forcipomyia taiwana（Shiraki）的產卵習性、棲群動態與對昆蟲生長調節劑感受性之研究

Abstract

The gonotrophic cycle of the blood-feeding females of Forcipomyia taiwana (Shiraki) were complete at 15℃, 20℃, 25℃, 30℃, and 35℃. Egg developmental rate in the gravid female is increase with temperature rising, and the oviposition rate of gravid female is significantly high at 25℃ and 30℃. Normally, there are circadian rhythm phenomenon in the ovipositiion of gravid female under 25℃, the higher peak of eggs laid are located at 12:00 to 18:00. The oviposition of gravid female F. taiwana is effected by the temperature, light, and the food of larva, and the light factor is most important that affects the oviposition. Pyriproxyfen is the effectiveness insect growth regulator (IGR) on the susceptibility of 2nd and 4th larva of F. taiwana among the three tested IGRs, Pyriproxyfen, Flufenoxuron, and Chlorofluazuron. There are 125 village or towns in 13 counties occurs F. taiwana under the distribution investigation during August to October, 2006. A highest collected record is at the 900 meters high upper sea in Nantou area. Seasonal dynamic of the population of F. taiwana was surveyed at two countries area, Shioufeng in Lugu village and Hsiolin in Jhushan township during May, 2005 to May 2007. These investigations show the low population density of F. taiwana in winter and early Spring seasons, and the density were increasing with temperature higher, than the highest population density was located at Summer seasons, in July and August. The dynamic of F. taiwana population density were affected by climate fluctuation. By using the correlation and multiple regression analysis, the temperature, relative humidity, and raining period are the most correlation meteorological factors with population density of F. taiwana, especially two weeks before the midge collected.