华北平原甜高粱蛀茎螟虫为害的初步研究

Study on Stem Borers of Sweet Sorghum in North China Plain

为掌握华北平原甜高粱受蛀茎害虫的为害情况,对河北和山东2省3地共9个甜高粱品种进行了田间调查。结果发现,目前华北平原为害甜高粱的蛀茎害虫主要有玉米螟(Ostrinia nubilalis)、高粱条螟(Procerasvenosatus)和桃蛀螟(Dichocrocis punctiferalis),其中玉米螟是优势种,占60%以上;品种间受害程度有较大差异,其中有2个品种100%被害,有1个品种受害率仅为15%;植株受害后糖垂度显著下降,平均降低30%以上,受害株与健株在糖垂度指标上存在极显著差异。

To mater the risk of stem borers in North China plain,the distribution of stem borers in 9 sweet sorghum varieties was investigated in three field locations in Hebei and Shandong.The results showed that Ostrinia nubilalis,Proceras venosatus and Dichocrocis punctiferalis were the main species,and O.nubilalis was the dominant species which accounted for over 60%.Obvious differences were found in damage levels among the sweet sorghum varieties.The damages on 1908 and Sart were severe,while that on Xiabonengsi No.1 was only 15%.The sugar sag decreased more than 30% after the plants being infested,and there were significant differences in the sugar sag between infested and healthy plants.