影响吉林省亚洲玉米螟〔Ostrinia　furnacalis　（Guenee）〕一代发生区发生量长期预测的关键因子──Ⅰ．发生程度与天敌及虫源基数的关系  

Key Factors Affecting Long-term Forecast of lst Asian Cosrn Borer(Ostrinia nubilalis)Emergency Size in Jiling Province──Ⅰ. Relation of Emergency Size with Natural Enemy and Overwinter Population Size

作　　者：李建平[1] 谢为民[1] 鲁新[1] 王蕴生[1] 杨桂华[1] 

机构地区：[1]吉林省农科院植保所

出　　处：《玉米科学》1995年第A01期72-74,共3页Journal of Maize Sciences

摘　　要：玉米螟的发生程度与越冬种群的天敌和虫源基数密切相关，对越冬种群影响比较大的天敌有玉米螟厉寄蝇、玉米螟长距茧峰、细菌和白僵菌。其中影响最大的是白僵菌，在５月末至６月下旬发病，寄生率在不同年度间变化很大，变化范围在４．５％～９０％以上，对虫源基数有重大影响。玉米螟大发生必须有足够的有效虫源，在吉林省一代为主的发生区，６月份的越冬虫量为有效虫源，在不考虑降雨的情况下，６月中旬的百秆活虫量与７月份性诱蛾量及秋季百株虫量均极显著相关（相关系数分别为０．７０２３和０．８６９．构成大发生的有效上源数至少为每百秆有３０头以上；７月份的累计单盆诱蛾量在３００头以上。ａｎｄｒ＝０．８６９ｒｅｓｐｅｃｔｉｖｅｌｙ）ｅｘｃｅｐｔｗｅａｔｈｅｒｆａｃｔｏｒ．Ｌａｒｖａｅｎｕｍｂｅｒｐｅｒ１００ｓｔａｌｋｉｎｍｉｄｄｌｅＪｕｎｅａｎｄａｄｕｌｔｎｕｍｂｅｒｔｒａｐｅｄｂｙｐｅｒｐｈｅｒｏｍｏｎｅｔｒａｐｉｎＪｕｌｙｉｓａｔｌｅａｓｔｏｖｅｒ３０ａｎｄ３００ｒｅｓｐｅｃｔｉｖｅｌｙｉｎｈｅａｖｙｅｍｅｒｇｅｎｃｙｙｅａｒｓ．Ｋｅｙｗｏｒｄｓ：Ｏｓｔｒｉｎｉａｆｕｒｎａｃａｌｉｓ；Ｆｏｒｅｃａｓｔ；Emergency size of Asian corn borer highly correlates with natural enemysand overwinter population size. Natual enemys affecting overwinter population seriouslyinclude Macrocentrus linearis, Lydella grisescens, Beauveria bassiniana and Bacilllusthruingiensis. Beauveria bassiniana is the most important factor among natural enemysand infested rate Changes from 4.sic over 90% in differnt years. Asain corn borer musthave enough valid overwinter population size (number of overwinter larvae in middleJune)in heavy emergency years.Number of overwinter larvae in middle June highly correlates with adult number inJuly and larvae number in autumn (r=0.7023** and r=0. 869** respectively)exceptweather factor. Larvae number per 100 stalk in middle June and adult number traped byper pheromone trap in July is at least over 30 and 300 respectively in heavy emergencyyears.

关 键 词：亚洲 玉米螟 天敌 发生量 预测 

分 类 号：S435.132[农业科学—农业昆虫与害虫防治]