Occurrence and Distribution of Herbicide Resistant Weeds in the Paddy Field of Chungnam Province

Ok Jae Won1   Wei Qiang Jia1   Jeung Joo Lee2   Jin-Won Kim3   Jeongran Lee3,*   Kee Woong Park1,*   

1충남대학교 농업생명과학대학 식물자원학과
2경상대학교 식물의학과, 농업생명과학연구원
3국립농업과학원 농산물안전성부 작물보호과

Abstract

This study was conducted to investigate the occurrence and distribution of herbicide resistant weeds at rice fields in Chungnam province of Korea in 2017. Herbicide-resistant weeds occurred in 64,782 ha, which comprise 47.0% of the total paddy field area of Chungnam province. The infested area of herbicide resistant weeds was estimated in Seosan-si (11.9%), Nonsan-si (11.1%), Dangjin-si (10.9%), Boryeong-si (9.2%) and Asan-si (7.8%). The most dominant herbicide resistant weeds in rice fields were Monochoria vaginalis, followed by Lindernia dubia, Schoenoplectus juncoides, Echinochloa oryzicola, Cyperus difformis and Sagittaria trifolia. Herbicide resistant M. vaginalis, L. dubia, and S. juncoides occurred throughout Chungnam province, and herbicide resistant S. trifolia was only found in Dangjin-si. Compared with the 2011 survey, the infested area of herbicide-resistant weeds decreased, but the incidence rates were similar. The herbicide rotation with different modes of actions across growing seasons is recommended to control herbicide-resistant weeds in the infested fields. It is necessary to monitor herbicide resistance regularly and conduct integrated herbicide resistance management in this area.

Figures & Tables

Fig. 1. Soil sampling sites in Chungnam province.