一、发生及为害情况 麦秆蝇在内蒙西部各产麦地区,近年来都有不同程度的发生。但以往为害,只是在小麦成熟期发现受害的白穗,从未有如1955年情况严重,有许多小麦,因生长衰退,根本就没有抽出穗来。据观察麦秆蝇对寄主的选择性很强,同 First, the occurrence and damage situation Muscle flies in Inner Mongolia in the western region of wheat, in recent years have varying degrees of occurrence. However, in the past, it was only harmful to white spikes found during the ripening period of wheat. It had never been as severe as 1955. There were many wheat that had not sprouted because of the recession. It is observed that the selectivity of the host fly straw fly, with