对绍兴市三大主要农业区划稻区的抛秧稻田杂草发生情况普查和定点系统调查表明，早稻抛栽田发生的杂草有２７ 种，分属１７ 科，主要杂草危害群落有１１ 种；杂草危害发生频率由高到低依次为稗草、矮慈菇、陌上菜、双穗雀稗、异型莎草等；危害严重度由重至轻依次为稗草、矮慈菇、异型莎草、双穗雀稗、千金子等。同时，查明主要危害杂草的发生特点和自然消长动态，为正确制订杂草防除措施提供依据。 Census and site-specific systematic surveys of weedy rice in paddy rice fields in the three major agricultural zoning areas of Shaoxing City showed that there were 27 species of weeds in early rice throwing fields, belonging to 17 families and 11 major weed communities ; The weed damage frequency from high to low in turn were barnyard grass, dwarf arrow mushrooms, street furniture, barnyardgrass, shaped sedge, etc .; the severity of harm from heavy to light in order of barnyard grass, dwarf arrow mushroom, Sedge, Paspalum, thousands of gold and so on. At the same time, identify the main characteristics of the occurrence of weeds and natural dynamics of growth and decline, to provide the basis for the correct formulation of weed control measures.