北方水稻和小麦种植区麦田灰飞虱种群发生动态及其带毒率研究

Population dynamics and virus-carrying rate of small brown planthopper,Laodelphax striatellus in northern paddyfields

灰飞虱Laodelphax striatellus(Fallén)是农业生产上的重要害虫之一,尤其是其传毒造成的危害更为严重。本文通过对山东省水稻种植区(包括稻麦轮作区与非轮作区)和小麦种植区灰飞虱田间种群发生量的系统调查、灯诱观测及其带毒率检测等得到如下研究结果:(1)与小麦种植区及水稻种植区非轮作麦田相比,稻麦轮作区麦田灰飞虱虫口密度高,可见稻麦轮作有利于灰飞虱种群发生危害;(2)山东省小麦种植区麦田灰飞虱仅发现携带黑条矮缩病毒,水稻种植区稻麦轮作田灰飞虱种群还检测到携带水稻条纹叶枯病毒;(3)灯诱高峰期灰飞虱带毒率与当地灰飞虱带毒率存在差异,说明有外来种群的迁入;(4)在检测的1 268头灯诱灰飞虱中只有1头体内同时检测到携带黑条矮缩病毒和水稻条纹叶枯病毒,可见灰飞虱可同时携带两种病毒,但概率极低。

The small brown planthopper （SBPH） Laodelphax striatellus （Fall6n） is a very important agricultural pest which can cause major harm to rice crops by acting as a vector of the rice stripe virus （RSV） and rice black streaked dwarf virus （RBSDV）. In this study, the population dynamics of SBPH and its virus-carrying rate were systematically investigated and measured in rice-wheat fields （rotation treatment vs. non-rotation treatment） in Shandong Province. The results indicate that （ 1 ） a higher SBPH density was found in the rice-wheat rotation regions than in the non-rotation treatment, so it is presumed that SBPH favor the rice-wheat rotation regions; （2） only RBSDV was detected in the SBPH from wheat fields, whereas both RBSDV and RSV were detected in SBPH from rice fields; （3） different virus-carrying rates were found between light-trapped SBPH and the local SBPH population in Ningjin County; and, （4） from a total of 1 268 individuals tested, only one SBPH simultaneously carried both RBSDV and RSV, which indicates that SBPH can simultaneously carry both viruses but that such individuals are relatively rare.