Alternative Herbicides for Eleocharis acicularis Resistant to Sulfonylurea in Jeonnam, Korea
2009
Kwon, O.D. (Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea) | Kuk, Y.I. (Sunchon National University, Sunchon, Republic of Korea), E-mail: [email protected] | Cho, S.H. (Jeonbuk Agricultural Research and Extension Services, Iksan, Republic of Korea) | Shin, H.R. (Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea)
The Eleocharis acicularis has been increased in reclaimed paddy fields in Jeonnam, Korea since 2006. These paddy fields were in monoculture rice production using sulfonylurea (SU) herbicides-based mixtures for 6-8 consecutive years. This research was conducted to investigate whether E. acicularis collected in Jeonnam, Korea has resistance to SU herbicides and determine alternative herbicides for the control of resistant E. acicularis by soil-applied herbicides with different application times. The susceptible biotype of E. acicularis was completely controlled with the respective recommended rates and 2 times of the recommended rates of the bensulfuron-methyl and pyrazosulfuron-ethyl regardless of herbicides application times (7 and 14 days after harrowing), but the resistant biotype was only 2.4~16.4% and 40.6~67.1% controlled with the respective recommended rates and 2 times of the recommended rates of the herbicides. The resistant biotype could be controlled by other herbicides having different modes of action from SU herbicides, such as thiobencarb, bromobutide, benzobicyclon, and oxadiazon when they were applied at 0 day after harrowing (DAH) and thiobencarb, bromobutide, benzobicyclon, benfuresateㆍbifenox, and piperophosㆍdimethametryn when they were applied at 8 DAH. On the other hand, benfuresateㆍbifenox, molinateㆍsimetrynㆍMCPB, and thiobencarbㆍsimetryn when they were applied at 15 DAH gave acceptable control (94.4~98.0%) of the resistant biotype. Our results are the first report of E. acicularis resistant to SU herbicides to in Korea, and thus further works are required to investigate resistance mechanism.
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