河北省廊坊市 唐山市和秦皇岛市麦田禾本科杂草发生情况调查

Investigation of Grassy Weeds in Wheat Fields in Langfang City,Tangshan City and Qinhuangdao City of Hebei Province

采用随机取点和倒置"W"型取样相结合的方法对河北省廊坊市、唐山市和秦皇岛市麦田禾本科杂草的发生情况进行了调查。结果表明:唐山市玉田县麦田有雀麦发生,相对多度为5.9%,发生程度处于第12位,田间频率达到6.8%,有进一步扩散的可能;唐山市丰润区和玉田县、秦皇岛市昌黎县麦田有少量狗尾草发生;廊坊市文安县、霸州市和固安县以及唐山市滦南县麦田没有发现禾本科杂草。

The occurrence of grassy weeds in wheat fields in different counties （cities） of Langfang City, Tangshan City and Qinhuangdao City were investigated by the methods of random sampling and inverted W-sampling pattern. The results showed that Bromus japonica was occured in Yutian County and the order of occurrence degree was 12th based on the relative abundance was 5.9% , but it could make more damage since the frequency was already 6. 8%. There was a little Setaria viridis in Fengrun District, Yutian County and Changli County. Grassy weeds was not found in Wen＇an County, Bazhou City, Gu＇an County and Luannan County.