Repellent Activity Of Plant Extracts On Rice Brown Planthopper Nilaparvata Lugens (Stal)

To exploit plant resource reasonably,the repellent effects of plant crude extracts on rice brown planthopper nymphs and female adults and the female oviposition were studied indoor,and the plant crude extracts and essential oils of well effect were used in wild experiment.The results are as follows:(1) Repellent activity of ethanol extracts of14non-host plant species and several related mixtures were studied on rice brown planthopper (BPH) Nilaparvata lugens. The results showed that the extract of Phyllostachys pubescens leaves (40mg-ml-1) had the highest anti-feeding activity on BPH, an repellent rate of47.67%at24h after the extract application, followed by the extracts from Eichhirnia crasslpes and Piper nigrum (80mg-ml-1), both of which had repellent rates of35.67%and34.38%at24h, respectively. The extracts from Zanthoxylum bungeanum and Allium fistulosum had obvious repellent roles on BPH female adults. At the concentration of80mg/ml, the repellent rates for BPH feeding and oviposition at24h after application were all higher than69%. A(2) mixture of the extract from E. crasslpes (80mg-ml-1) with the extract from Z. bungeanum (80mg-ml-1)(a ratio of1:1) had a good repellent activity on BPH nymph and female adult feeding, and female adult oviposition, the repellent rates were85.4%,61.2%and83.1%, respectively. The antifeedant effects of23plant essential oils on rice brown planthopper nymphs was studied.The results showed that the effects are obvious, and the effect increased with the concentration increasing. In the experiments, the effect of paeonol is best, antifeedant rate reach to81.4%; in the plant essential oil concentration of rhizoma, cinnamon, citronella and clove is40mg/ml-1, antifeedant rates reach to94.9%、95.6%、83.0%、93.3%respectively.(3) The experiment was conduct in September2010in Yangzhou Yizheng.mixture of80mg/ml-1Zanthoxylum. simulans Hance with80mg/ml-1water hyacinth and80mg/ml-1Z simulans Hance with80mg/ml-1bamboo have some repellent effect on the elderly nymphs, effect of cinnamon oil on the old nymphs are more than70%.Test range will be expanded gradually in the field.