番茄斑潛蠅(Liriomyza bryoniae (Kaltenbach)) 在臺灣之發生調查

Abstract

番茄斑潛蠅（Liriomyza bryoniae）在甘藍全年有兩次發生盛期。第一次在3至6月，高峯在4月；第二次在10至12月，高峯在10月。上半年的族羣密度較下半年為高，7至9月因受降雨量多之影響，發生較少。4月和10月兩次高峯之平均氣溫係在25至27℃之間，此可能為該蟲發生最適之氣溫。臺灣平原地區及離島各主要蔬菜產地都有分佈，但梨山、武陵和福壽山等地尚未發現。被害蔬菜有十字花科，葫蘆科，菊科和茄科等。番茄斑潛蠅在其發生高峯期，全區寄主植物幾乎90至100％受害。為害度和為害葉率及為害株率均呈極顯著正相關。番茄斑潛蠅天敵迄今有寄生蜂兩種：卽Halticoptera circulus（Walker），和Opius phaseoli Fischer，前者的寄生率較後者為高。 The tomato leafminer, Liriomyza bryoniae, was recorded as a new insect pest on cabbage in Fengshan, Taiwan in March 1984. Seasonal occurrence of the leaf miner investigated in Southern Taiwan from 1985 to 1987 indicated that there were two population peaks of the insect in a year. The first peak appeared steadly in April; while the second peak was occasionally appeared in October. The leafminer has almost distributed throughout all the plain areas in the island. It is a highly polyphagous species. The vegetables including many varieties of Cruciferae, Cucurbitaceae, Compositae and Solanaceae were found injured severely by this species up to now. Two species of parasitoid reared from the pupae of the leafminer were the Halticoptera circulus (Walker), and Opius phaseoli Fischer. The former was more numerous than the latter.