生态学主要挑战之一是如何阐明组团内物种的共存问题。物种组团是群落和种群生态学研究的一个前沿研究领域。尤其是欧美国家是很热门的研究领域。稻田飞虱组团（包括褐飞虱、白背飞虱、灰飞虱）水稻毁灭性重大害虫。前期有关农药刺激褐飞虱生殖进行了系统研究，获得了一些创新成果。然而近期我们发现了一个非常重要和有趣的现象—井冈霉素刺激褐飞虱生殖但抑制白背飞虱生殖。而茚虫威抑制褐飞虱生殖但刺激白背飞虱生殖。这一现象激发了我们的极大兴趣。为什么生态位相同或相似的组团物种间具有相反的效应。为此本项目将通过褐飞虱数字基因表达谱、白背飞虱转录组分析，候选出3-5个关键基因进行功能及对应的RNAi雌虫生化测定研究，以其阐明农药诱导的飞虱组团物种生殖相反效应的分子机理。本项目不仅在农药精准使用（避免组团物种内某一物种发生再猖獗）具有重大实践意义，而且对组团物种进化及其种群间此起彼伏猖獗具有重要理论意义。

A major challenge in ecology lies in understanding the coexistence of intraguild species. Guild is a frontier research of community and population ecology study, especially in Europe and America. Planthopper guild in rice field including the brown planthopper (BPH), the white-backed planthopper (WBPH) and the small brown planthopper (SBPH) is major devastating pests. Numerous studies on pesticide-induced the stimulation of reproduction of BPH were conducted and some innovative findings were obtained in our previous investigations. However, our recent study found an important and interesting phenomenon: jinggangmycin stimulated the reproduction of BPH but suppressed the reproduction of WBPH, while indoxacarb suppressed the reproduction of BPH but stimulated the reproduction of WBPH. The phenomenon stimulates our research interest. Why planthopper intraguild species with the same or similar niche have inverse effect to pesticide-induced reproductive response. Therefore, we will select 3-5 key genes associated with reproduction and metabolism and used for the gene function by RNAi based on the analysis of gene expression profiles of pesticide-treated BPH, transcriptome of –treated WBPH. The objective is to understand the molecular mechanisms of the inverse effect of pesticide-induced of reproduction of palnthopper guild. The present study has not only important practical significance for accurate application of pesticides (avoid resurgence occurrence of planthopper intraguild species) but also has a theoretical significance for exogenous factor (e.g. pesticides)-induced molecular niche separation of planthopper intraguild species and outbreaks.