Abstract We investigated the effects of the leaf cuticular extracts of the tropical soda apple, Solanum viarum, on the oviposition of the tomato fruitworm, Helicoverpa armigera, a worldwide phytophagous pest. In a dual-choice laboratory assay, the cuticular extracts of the leaves of S. viarum showing significant attraction (p < 0.05) to H. armigera females for oviposition was fractioned by the use of normal-phase silica Sep-Pak cartridges. Five fractions eluted with diethyl ether in hexane (F1, F2, F3, F4, and F5) were compared for efficiency, as assessed by the mean number of eggs laid, in stimulating oviposition by the female. Only fractions F2 (40% ether) and F3 (60% ether) showed significant effects of stimulating oviposition. Scanning electron microscopy revealed the presence of sensilla trichodea and sensilla coeloconica on the antennal hairs which might bear receptor neurons for the detection of plant semiochemicals.
摘要 本實驗探討熱帶刺茄Solanum viarum (Dunal)，葉面表皮萃取物對於分布全世界的重要植物害蟲番茄夜蛾Helicoverpa armigera (Hübner)產卵的影響。在雙重選擇實驗分析下，利用常相silica Sep-Pak cartridges分析顯示，S. viarum葉片表皮的萃取物對雌番茄夜蛾產卵具顯著誘引效果(p < 0.05)。5個分級(F1, F2, F3, F4及F5)乃以正己烷洗提稀釋不同濃度乙醚，並用以刺激雌蟲產卵，來比較產卵平均數的效果。只有F4 (40% ether)及F3 (60% ether)對刺激產卵有相當大的影響。掃描式電子顯微鏡指出在番茄夜蛾觸角上的觸毛有感覺毛(sensilla trichodea)及腔內感覺器(sensilla coeloconica)的存在，其可能具有接收神經可偵測植物訊息化學物(plant semiochemicals)。
| Key words: Helicoverpa armigera, Solanum viarum, oviposition, sensilla, plant semiochemicals | | 關鍵詞: Helicoverpa armigera、Solanum viarum、產卵、感覺毛、植物訊息化學物 |
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