クマリンのヤサイゾウムシ成虫に対する誘引と摂食阻害作用-スィートクローバー葉の不可食性との関係

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タイトル別名
  • A Dual Effect of Coumarin, Olfactory Attraction and Feeding Inhibition, on the Vegetable Weevil Adult, in Relation to the Uneatability of Sweet Clover Leaves
  • ショク ヨウセイ コンチュウ ノ キシュ ケッテイ ニ カンスル ケンキュウ エイブン 6
  • Studies on the Host Plant Determination of the Leaf-Feeding Insects VI
  • 食葉性昆虫の寄主決定に関する研究 VI

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During the course of the feeding tests of the vegetable weevil, Listroderes costirostris obliquus KLUG, on various plants, in relation to the host selection studies, it was indicated that the adults could hardly eat leaves of sweet clover, Melilotus alba and M. officinalis. Some investigations were made to elucidate the factors participating in this uneatability of sweet clover for the adults. The results obtained are as follows:<br>1. Adults were olf actorily attracted by the odor of sweet clover leaf and its juice, and furthermore they could perform the antennal tapping, mouth-touching, and biting which are the preceding steps of the continuous feeding. However, they could hardly perform the continuous feeding on them. Especially in the case of juice, the biting action was impeded promptly.<br>2. On the juice of Santohakusai leaves added with the juice of sweet clover leaves, the continuous feeding did not proceed so successfully as on the juice of Santohakusai leaves in control.<br>3. It was suggested from these results that sweet clover leaf contains not only some attracting odorous substances, but also some feeding inhibitory substances.<br>4. Coumarin, an principal odorous constituent of sweet clover was tested and it was foundto be effective as an attractant. But, adults could not proceed into the later attacking steps, the antennal tapping, mouth-touching, biting, and continuous feeding.<br>5. A diet containing coumarin and Santohakusai leaf juice was tested. Adults were attracted by it, and could proceed at least to the biting step and somewhat to the continuous feeding step. But the biting and the continuous feeding were impeded in the presence of coumarin (0.10∼0.017%) likewise in the attacking case to sweet clover leaf or its juice.<br>6. It is not difficult, from these facts, to accept the conclusion that coumarin is a chemical factor pertaining in the uneatability of sweet clover for adults of this insect.<br>7. The dual effect of coumarin, attraction and feeding inhibition makes a contrast with the effects of leaf alcohol, mustard oils, and umbelliferous essential oils which elicit the biting action together with the attraction.<br>8. It would seem that the first receptors of inhibition by some substances including coumarin are there on the maxillary palpi.

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