【摘要】 2004年4月19日~5月31日采用五点取样法对景泰县第一茬苜蓿昆虫种类、群落结构及数量动态进行了网捕调查,共获得昆虫36种,隶属9目24科,其中,鳞翅目和膜翅目的科数最多;缨翅目的个体数量最多;鞘翅目的种数最多。第一茬苜蓿主要害虫为花蓟马(Trankliniellaintonsa)、苜蓿斑蚜(Therioaphistrifolii)、条纹根瘤象甲(Sitonalineatus)、牧草盲蝽(Lyguspratensis),主要天敌为多异瓢虫(Adoniavariegate)。各种昆虫数量动态随温度和苜蓿生长阶段的变化较明显,主要害虫种群数量在刈割前均有明显上升趋势。试验证明在当地第一茬苜蓿虫害管理中,返青期应以象甲类害虫,刈割前应以苜蓿斑蚜和苜蓿蓟马为主要监控对象。更多还原

【Abstract】 Investigation on the species,community structure and population dynamics of insect in alfalfa after first cutting in Jingtai was carried out from April 19 to May 31,2004.Totally 36 species were found,which belong to 24 families,9 orders.The dominant pests were Trankliniella intonsa,Therioaphis trifolii,Sitona lineatus and Lygus pratensis,the dominant natural enemy was Adonia variegate.The population dynamic of insects and the growth of the alfalfa were significantly related to the temperature.It was obvious that population of the dominant pests was increasing before the harvest.The main monitoring targets were weevils in beginning period of the regrowth after winter,and aphids and thrips before the first harvest.更多还原