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| Occurrence of Glyphosate-Resistant Horseweed (Conyza canadensis) Population in China |
| Weed Research Laboratory, Nanjing Agricultural University |
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摘要 Horseweed (Conyza canadensis), an invasive alien weed, is one of the main weeds in orchards in China. Althoughglyphosate has been used for control of horseweed and many other weeds in orchards for more than 25 years in China, acase of glyphosate-resistant horseweed has not been identified in orchard in China so far despite glyphosate-resistanthorseweed cases have been reported in some other countries. Seeds of 25 horseweed populations were collected fromdifferent orchards with different glyphosate application history. Potted seedlings with 11-13-leaf growth stage weretreated 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 dependenceresponse curve of each population was constructed with Log-logistic dose response regression equations. The ED50value of each population was calculated and compared with the susceptible population from China. Different populationshad 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 populationsaccumulated approximately two to four times less shikimic acid than the two susceptible populations 48 h after glyphosateapplication.
Abstract Horseweed (Conyza canadensis), an invasive alien weed, is one of the main weeds in orchards in China. Althoughglyphosate has been used for control of horseweed and many other weeds in orchards for more than 25 years in China, acase of glyphosate-resistant horseweed has not been identified in orchard in China so far despite glyphosate-resistanthorseweed cases have been reported in some other countries. Seeds of 25 horseweed populations were collected fromdifferent orchards with different glyphosate application history. Potted seedlings with 11-13-leaf growth stage weretreated 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 dependenceresponse curve of each population was constructed with Log-logistic dose response regression equations. The ED50value of each population was calculated and compared with the susceptible population from China. Different populationshad 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 populationsaccumulated approximately two to four times less shikimic acid than the two susceptible populations 48 h after glyphosateapplication.
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Received: 27 July 2010
Accepted: 14 August 2011
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Corresponding Authors:
Correspondence QIANG Sheng, Professor, Tel: +86-25-84395117, E-mail: qiangs@njau.edu.cn, wrl@njau.edu.cn
E-mail: sxl@njau.edu.cn
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| About author: SONG Xiao-ling, Ph D, E-mail: sxl@njau.edu.cn; |
Cite this article:
SONG Xiao-ling, WU Jia-jun, ZHANG Hong-jun and QIANG Sheng.
2011.
Occurrence of Glyphosate-Resistant Horseweed (Conyza canadensis) Population in China. Journal of Integrative Agriculture, 10(7): 1049-1055.
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