日本看麦娘 (AlopecurusjaponicusSteud)属禾本科一年生杂草 ,自 2 0世纪 90年代初期危害逐年加重 ,现已成为舞钢市麦田主要杂草之一 ,一般可影响小麦产量 10 %～ 2 0 %。 1999～ 2 0 0 2年 ,笔者对日本看麦娘在本地的发生及防治技术进行了研究。1　形态特征幼苗 :第 1片真叶带 Alopecurus japonicus Steud is a gramineous annual weed which has been increasing year by year since the early 1990s. It has become one of the major weeds in the wheat field of Wugang City and generally affects the yield of wheat from 10% to 20%. From 1999 to 2002, the author studied the occurrence and prevention and control of Amaryllis in Japan. 1 Morphological characteristics Seedlings: the first true leaf band