(36(1):111-117)Field Trapping of the Diamondback Moth, Plutella xylostella by Using Synthetic Sex Pheromone - Ⅱ. The Effective Control and Population Monitoring of Sex Pheromone of Diamondback Moth

為測定小菜蛾性誘劑在本省田間之誘雄實效，乃在臺中萬豐本所農場進行試驗。得知性誘劑（Z11-16 : Ald + Z11-16 : Ac + Z11-16 : OH , l : 1 : 0.02 ）劑量為50 或100 ug ，誘蟲盒間隔距離為2.2 或4m 時，對小菜蛾族群均無抑制效果；使用劑量為50 ug ，誘蟲盒間隔距離為11m ，其1 週所誘得雄蛾數能反映其使用前1 週，或預測誘集後1 及2 週甘藍上小菜蛾第三與四齡之幼蟲數，其r 值分別為0.855（n=21），0.662（n=16 ）及0.578 （n=14 ）。又該劑對寄生小菜蛾幼蟲之小繭蜂Apanteles plutellae無引誘力。 Studies were conducted in cabbage field of the Taiwan Agricultural Research Institute at Wufeng, Taichung during 1980-1982, to determine the potential synthetic sex pheromone trapping for controlling and monitoring diamondback moth (DBM), Plutella xylostella. The results showed that the sex pheromone lure (Z1l-16 : Ald+ Z11-16 : Ac＋Z11-16 : OH, 1: 1 : 0.02) with 50 or l00ug per trap set up a distance as dense as 2.2m (25 traps/l00m2) or 4m (15 traps/240m2) apart, were not able to control the subsequent populations of DBM occurred in the field. However, the total number of male moths cought weekly by the traps (50ug/trap) set at 11m apart (1 trap/l00m2) showed the correlation with the subsequent populations of the 3rd- and 4th-instar larvae of DBM occurring 2-week later. The sex pheromone lure did not attract the braconid, Apanteles plutellae, a larval parasitoid of DBM