Korean Journal of Weed Science (한국잡초학회지)

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Characteristic and Management of Sulfonylurea-Resistant Scirpus planiculmis Confirmed in Reclaimed Paddy Fields, Korea

한국 간척지 논에서 확인된 설포닐우레아계 제초제 저항성 새섬매자기(Scirpus planiculmis)의 특성과 관리

Park, Tae-Seon;Mun, Byeong-Cheol;Gang, Chung-Gil;Park, Jae-Eup
박태선;문병철;강충길;박재읍

  • Published : 20060000
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Abstract

A suspected biotype of Scirpus planiculmis (S. planiculmis)to be resistant to sulfonylurea (SU) herbicides was identified in Seosan reclaimed paddy fields in Korea. The fields have been cultivated for mono-cultural rice production with wet-direct seeding method and continuously treated with SU-based herbicide mixtures for thirteen years since 1990. The apparent SU resistance observed in S. planiculmis was completely confirmed in greenhouse tests. The GR50 values of 6 SU herbicides for SU-resistant biotypes were 47 to 100 times higher than those for SU-susceptible biotypes. The I50 values of pyrazosulfuron-ethyl to acetolactate synthase (ALS) extracted from SU-resistant and -susceptible S. planiculmis were 409 nM and 0.8 nM, respectively. The I50 value of the resistant biotype was 511 times higher than that of the susceptible biotype. The germination and growth rate from corm and seed of SU-resistant S. planiculmis under growth chamber were high with the rise of temperature, and the degrees of those were greater in corm than seed. In the interspecific competition according to SU-resistant S. planiculmi density in constant the rice 3 plants under wet direct seeded rice, the growth of rice decreased with the increase of S. planiculmi density and significant differences were from 6 plants of S. planiculmi density. Several herbicides having different mechanism of action from SU herbicides, such as benzobicyclone and HAR had excellent controlling effects on the SU-resistant S. planiculmi in the pot and paddy rice field experiment.

Sulfonylurea계 제초제에 대한 저항성 새섬매자기가 한국의 서산 간척지 논에서 발생한 것이 확인되었다. 온실 조건에서 서산과 무안에서 채취한 새섬매자기 구경을 이식 후 10일에 azimsulfuron, bensulfuron-methyl, cinosulfuron, ethoxysulfuron, imazosulfuron 그리고 pyrazosulfuron-ethyl을 처리하였을 때 무안의 새섬매자기는 각 제초제 추천량에서 방제가 되었으나 서산의 새섬매자기는 추천량의 5배량에서도 20-40% 생존되었다. 생체중 50%를 억제하는 각 제초제의 농도(GR50)는 두 지역에서 채취한 새섬매자기 간에 현저한 차이가 있었으며, 서산의 매자기에 대한 6 종류 제초제의 GR50은 무안의 새섬매자기 대한 GR50 값 보다 47-100배 높게 나타났다. 또한 무안과 서산의 새섬매자기에서 추출한 acetolactate synthase(ALS)에 대한 pyrazosulfuron- ethyl의 50% 억제 농도(I50)는 각각 0.8 nM과 409 nM로 나타나, 서산의 새섬매자기가 무안의 새섬매자기 보다 511배 높은 저항성을 가지고 있음을 확인하였다. 번식체별 발아율 및 생장은 온도가 높을수록 증가하였으며, 종자보다 괴경에서 훨씬 높게 나타났다. 저항성 새섬매자기 발생밀도별 벼와 종간경합에서 새섬매자기 3주 발생에서부터 유의차가 있었다. 온실 및 논 조건에서 비SU계 제초제들에 대한 반응을 조사한 결과 HAR와 benzobicyclone SC가 매우 효과적이었다.HerbicideApplication time (DAT1))Application rate(ai g ha-1)Efficacy (%)Benzobicyclone SCHAR GRPyrazosulfuron-ethyl+molinate GR3101014067(21+1,500)9510091)DAT：days after transplanting.

Keywords

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