Occurrence of Glyphosate-Resistant Horseweed (Conyza canadensis) Population in China

查看全文 作　　者：SONG Xiao-[1]ling;WU Jia-[1]jun;ZHANG Hong-[2]jun;QIANG [1]Sheng

机构地区：[1]Weed Research Laboratory, Nanjing Agricultural University, Nanjing 210095, P.R.China;[2]Institute for the Control of Agrochemicals, Ministry of Agriculture (CAMA), Beijing 100026, P.R.China

出　　处：《Agricultural Sciences in China》索引2011年第10卷第7期,共7页

基　　金：supported by the National Basic Research and Development Program of China (2007CB109202);the National Natural Science Foundation of China (30400059);the National Specific Program on Environmental Protection for Public-welfare Industry of China (200709017) 摘　　要：Horseweed (Conyza canadensis), an invasive alien weed, is one of the main weeds in orchards in China. Although glyphosate has been used for control of horseweed and many other weeds in orchards for more than 25 years in China, a case of glyphosate-resistant horseweed has not been identified in orchard in China so far despite glyphosate-resistant horseweed cases have been reported in some other countries. Seeds of 25 horseweed populations were collected from different orchards with different glyphosate application history. Potted seedlings with 11-13-leaf growth stage were treated with glyphosate at 0.035, 0.07, 0.14, 0.28, 0.56, 1.12, 2.24, 4.48, and 8.96 kg a.i. ha-1. The dosage dependence response curve of each population was constructed with Log-logistic dose response regression equations. The ED50 value of each population was calculated and compared with the susceptible population from China. Different populations had different relative glyphosate-resistant levels which increased with the number of years of glyphosate application. Two populations with the highest resistance levels, 8.28 and 7.95 times, were found in Ningbo, Zhejiang Province, China, where glyphosate was used for weed control in orchards twice each year for 15 yr. The two resistant populations accumulated approximately two to four times less shikimic acid than the two susceptible populations 48 h after glyphosate application. 关键词：加拿大一枝黄花抗草甘膦中国人口杂草控制易感人群剂量反应抗性种群

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Occurrence of Glyphosate-Resistant Horseweed (Conyza canadensis) Population in China

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