顏福成 黃天福 張賜海
目前台南地區落花生主要之害蟲，以夜蛾科之斜紋夜蛾Spodoptera litura Fabricius及甜菜夜蛾Spodoptera exigua Hubner發生量較多，番茄夜蛾Helicoverpa armigera Hubner次之。斜紋夜蛾每公頃設放4∼5個，甜菜夜蛾8∼9個，番茄夜蛾13∼18個誘蟲盒，實行性費洛蒙大量誘殺後，田間雄蛾誘殺數隨落花生之生長而上昇，並未因誘殺而下降現象。但若在田間族群密度底之環境下，經過20∼30天後，其相對誘殺數較未誘殺區有明顯減少之現象。惟若在族群密度高之環境下，需經30∼50天始有略降現象，且不明顯。若於落花生播種後即行大量誘殺，自20天後田間幼蟲發生量開始明顯減少，落花生全生育期間可減少60％之幼蟲數。被害葉率可自未誘殺區之81％減至48％。不同誘蟲器設放位置之誘殺數，以外圍四角點最多，外圍次之，內部最少。
Utilization of Sex Pheromone for Mass-trapping Major Insect Pests of Peanut
Yen, F. C., T. F. Huang, and S. H. Chang
Tobacco cut worm, beet army worm and tomato fruit worm are three major insect pests of peanut in Tainan district. Mass-trapping by using synthetic sex pheromone was conducted in the field. The number of trap set in the field were 4~5, 8~9, and 13~18/ha for tobacco cut worm, beet army worm and tomato fruit worm, respectively. When the insect population was high at the beginning of trapping, the number of male moths trapped increase with time or the growth stage of peanut and did not decrease even after 30~50 days of trapping. However, if the population was low at beginning, the trapping efficiency was very significant, and the insect population decrease drastically in 20~30 days. When the trapping started right after the sowing of peanut, the number of larvae decreased significantly in 20 days. Number of larvae in the trapping field was only 40% of the non-trapping field. The number of damaged leaves reduced from 81% in the non-trapping field to 48% in the trapped field. More moths were trapped at the four corners and at the edges of the trapping field than that in the central field.
Accepted for publication: September 11, 1991.