贵州省西部地区稻田发生的杂草有27科61种,其中以稗草、鸭舌草、眼子菜为优势种,其次是慈菇和牛毛毡。禾本科杂草、阔叶杂草、莎草科杂草的发生分别在插秧后7～15天、15～20天、20～30天达到高峰。5.3％丁西颗粒剂对稻田杂草的群体防效在70％以上,其亩用药量为74克(ai)。 There were 27 families and 61 species of weeds in the paddy field in the western Guizhou Province, of which barnyard grass, monocotyledon and ophthalmophilus were the dominant species, followed by Sagittaria indica and cattle blankets. Gramineous weeds, broad-leaved weeds, sedge weed occurrence occurred after 7 to 15 days after planting, 15 to 20 days, 20 to 30 days to reach its peak. 5.3% Dixie granules on rice weed population control effect in more than 70%, the mu dose of 74 grams (ai).