Influence of Plants Constituents on Feeding Behavior of Sucking Insects.

蚜虫、飞虱和叶蝉对寄主植物的选择和植物材料对采蜜的影响研究较多。本文首先对红白花豆（Dolichos lablab）寄主选择行为进行了实验研究。我们从中国的观察中了解到，红色开花的豆荚中的色素不会妨碍从红色茎中吸取。在这一阶段，我们停止了对A. craccivora的实验。然后，我们对绿叶蝉进行了摄食偏好测试。四种绿叶蝉（Nbohotettix cineticeps， N. nigropictus， N. virescens和N. malayanus）分布于亚洲温带至热带地区。与栽培的水稻品种相比，马来褐蝽更喜欢禾本科草Leersia hexandra作为寄主植物。所有4个物种的菌落均保存在实验室的水稻幼苗上，除马来褐飞虱外，其余3个物种的菌落已建立。利用水稻品种和禾本科牧草进行寄主偏好试验，发现寄主在寄主存活率、寄主生长指数和寄主摄食电测量（EMIF）方面存在差异。实验结果表明，“nihonbare”对3种nephotetix有摄食刺激作用，IR42对北蠓和黑纹伊蚊有摄食抑制作用。六爪草含有对绿足螨的取食抑制剂。首先在植物种子上进行了EMIF试验，并通过人工膜、副膜扩大了植物提取物的饲喂试验。目前，人们正在研究从水稻品种和禾本科植物的提取物中鉴定绿叶蝉偏爱的化学因子。

There has been much studied on host plant selections and the influence of plant materials to sap suiting by aphids, planthoppers and leafhoppers. First we have taken experiments on host selection behavior of Aphis cractivora on the red and white flowering lablab beans(Dolichos lablab). Rid pigments in the red flowering lablab bean did not disturb sucking from the red colored stem, as we learned from Chinese observation. We discontinued the experiments on A. craccivora at this stage.We then took experiments on feeding preference tests on the green leafhoppers. Four green leafhoppers, Nbohotettix cineticeps, N. nigropictus, N. virescens and N. malayanus distribute from temperate to tropical regions of Asia. N. malayanus prefer Leersia hexandra, a gramineous grass, as host plant than cultivated rice cultivars. All four species colonies were kept in our laboratory on rice seedlings and three Nephotettix well established colonies except for N. malayanus. Host preference tests were carried out using rice cultivars and gramineous grass and found differences on survival rate, growth index and feeding experiments using electric measurement of insect feeding(EMIF) were carried out. Test results indicated presence of feeding stimulant in "nihonbare" for three Nephotettix spp. and feeding inhibitor in IR42 for N. cincticeps and N. nigropictus. L. hexandra contains feeding inhibitor for N. virescens. EMIF were first carried out on plant seedings and feeding tests were expanded using with plant extracts through artificial membrane, parafilm. Identification of chemical factors on preference by the green leafhoppers are now being investigated in extracts from rice cultivars and gramineous plants.