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近年来豚草和三裂叶豚草迅速蔓延,一则是过去没重视其防治,再则是进口转运粮食携带传播。据调查,在国内有豚草和三裂叶豚草两种。现已查明,豚草已扩散蔓延至黑龙江、吉林、辽宁、湖北、江苏、山东、浙江、江西、安徽等省的局部地区。目前两种豚草种子还仍随着粮食转运,交通工具携带,水流等向各地传播。1987年,上海、北京、湖南等局部地区又分别发现密集成群的豚草及三裂叶豚草。尤其是三裂叶豚草的长势更兴旺,比起一般的高出1-2倍,高达4米左右。发现的豚草和三裂叶豚草有的已进入果园、菜园及茶园。当
In recent years, ragweed and Crassulaceae rapidly spread, one is the past did not attach importance to its prevention and control, then the import of trans-shipment of food to carry spread. According to the survey, there are two kinds of ragweed and trifoliate ragweed in the country. It has been identified that ragweed has spread and spread to some areas in Heilongjiang, Jilin, Liaoning, Hubei, Jiangsu, Shandong, Zhejiang, Jiangxi and Anhui provinces. At present, the two kinds of ragweed seeds are still spread with food transport, transport vehicles, water and so on. In 1987, Shanghai, Beijing, Hunan and other localities were also found in groups of Ragweed and Tripterygium respectively. In particular, the development of Crataegus triphylla more prosperous, 1-2 times higher than the average, up to 4 meters. Found ragweed and Crassula some have entered the orchards, vegetable gardens and tea plantations. when