亚洲玉米螟棉田为害型形成机理分析

A MECHANISM ANALYSIS OF FORMATIVE INJURY TYPES OF OSTRINIA FURNACALIS IN COTTON FIELD

研究表明,不同寄主植物对亚洲玉米螟的发育、存活、繁殖和种群增长的影响显著。取食玉米雌穗的种群世代存活率最高,棉铃次之,棉茎最低。以玉米雌穗、棉铃、棉茎为食料的世代净生殖率依次为45.62、27.91和0.48;其内禀增长率分别为0.0962、0.0846和-0.0143。在一定距离内玉米田的虫源可影响棉田的为害程度。分析了江苏棉区玉米螟不同为害型的形成机理,棉田1代玉米螟缺乏适宜食料和外来虫源可能是形成不同为害型的主要因素。

There were significant differences among the development ,survival ,reproduction and population increase of Asian corn borer (ACB) Ostrinia furnacalis (Guenee) fed on different crop and organs. As it fed on corn ear,cotton boll and cotton stem, its whole generation survivals were highest, medium and lowest, its R0s were 45. 62,27. 91 and 0. 48,and its rms were 0. 0962,0. 0846 and -0. 0143,respectively . In certain distance range,the damage extent of ACB in cotton field was associate with its source from corn field. The mechanisms of different damage patterns of ACB in cotton fields were analysed. It was indicated that the suppression of poor food quality of 1st generation and exotic source of ACB were the main factors causing the different formations of damage patterns.