Korean Journal of Weed Science (한국잡초학회지)

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Selectivity of Pyribenzoxim and Bispyribac-sodium Between Echinochloa crus-galli and Rice (Oryza sativa)

피와 벼에 대한 피리벤족심과 비스피리백-소디움의 선택성

Hwang, Gi-Hwan;Kim, Do-Sun;Lee, Jong-Nam;Gu, Seok-Jin
황기환;김도순;이종남;구석진

  • Published : 20060000
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Abstract

Dose-response studies were conducted to compare herbicidal activity and rice selectivity of pyribenzoxim and bispyribac-sodium. When tested with formulations at the constant adjuvant concentration regardless of herbicide dose, the GR90 value (the rate required to inhibit growth by 90%) of pyribenzoxim for barnyardgrass was 8.7 g ai ha-1, while that of bispyribac-sodium was 7.7 g ai ha-1. The GR10 values (the rate required to inhibit growth by 10%) of pyribenzoxim and bispyribac- sodium were 93.3 g and 2.9 g ai ha-1 for Japonica rice and 185.8 and 23.9 g ai ha-1 for Indica rice, respectively. The selectivity indices (GR10 for rice/GR90 for barnyardgrass) of pyribenzoxim for Japonica and Indica rice were 10.7 and 21.3, respectively, while those of bispyribac-sodium were 0.4 and 3.1, respectively. Therefore, selectivities of pyribenzoxim were 6.8 and 28.0 folds greater for Japonica and Indica rice, respectively, than those of bispyribac-sodium. In addition, the selectivity indices of technical ingredients of pyribenzoxim and bispyribac-sodium were 1.5 and 0.5, respectively, showing about 3 folds difference. The selectivity indices of their formulations tested with no adjustment of adjuvant concentration were 1.2 and 0.5, respectively, showing 2 folds difference. These results thus demonstrate that although pyribenzoxim and bispyribac-sodium are similar in herbicidal activity to barnyardgrass, pyribenzoxim is a vastly advanced herbicide in rice selectivity.

피리벤족심과 비스피리백-소디움에 대한 피와 벼의 농도반응을 비교하여 이들의 선택성을 비교하고자 포트시험을 온실에서 수행하였다. 피에 대한 제초효과는 비스피리백-소디움이 피리벤족심보다 약간 높았지만 그 차이는 매우 작았으며, 벼에 대한 약해는 두 제초제 간 현저한 차이가 있어 피리벤족심이 자포니카 벼에는 약 5~30배, 인디카 벼에는 약 8배 안전하였다. 피리벤족심과 비스피리백-소디움에 대한 피의 GR90값과 벼의 GR10값을 상대적으로 비교한 선택성지수를 계산한 결과 원제에 대한 선택성지수는 피리벤족심이 1.5, 비스피리백-소디움이 0.5로써 피리벤족심이 약 3배 선택성이 높았으며, 제제를 직접 비교한 결과 피리벤족심이 1.2, 비스피리백-소디움이 0.5으로 여전히 피리벤족심이 2배 이상 선택성이 높았다. 특히, 전착제 농도를 일정하게 한 조건에서 비교한 결과 자포니카 벼의 경우 피리벤족심의 선택성지수는 10.7, 비스피리백-소디움은 0.4로 약 28배의 선택성의 차이가 났으며, 인디카 벼의 경우 피리벤족심이 21.3, 비스피리백-소디움이 3.1로 약 7배의 선택성 차이가 났다. 결론적으로 피리벤족심과 비스피리백-소디움은 피에 대해 유사한 제초활성을 갖지만, 벼에 대한 안전성은 피리벤족심이 매우 높았으며, 따라서 피리벤족심의 선택성이 아주 높았다.

Keywords

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