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Sulfonylurea계 제초제가 처리된 다년생 잡초의 재생양상과 저장전분량의 변화
황인택(Hwang I.T.),이관휘(K.H. Lee),홍경식(K.S. Hong),김진석(J.S. Kim),이병회(B.H. Lee),조광연(K.Y. Cho) 한국농약과학회 2002 농약과학회지 Vol.6 No.1
Characteristics of regrowth and starch degradation in perennial weed rhizomes were investigated in a greenhouse. Cyperus serotinus started regrowth at 24 days after treatment of 1.25 g ai/㏊ of pyrazosulfuron-ethyl. The regrowth of Sagittaria trifolia, Eleocharis kuroguwai, and S. pygmaea required 30~39 days, and Potamogeton distinctus regrew at 55 days after treatment of 1.25 g ai/㏊ of pyrazosulfuron-ethyl. However, all of 5 perennial weeds hardly regrew until 45 days after treatment more than 5 g ai/㏊ of pyrazosulfuron-ethyl. Regrowth of C. serotinus 4-node rhizomes was 2 times higher than 2-node rhizomes, and 1~1.5 g of E. kuroguwai large tubers regrew faster than 0.3~0.5 g of small tubers treated with bensulfuron-methyl. Regrowth of C. serotinus was enhanced with delayed application of bensulfuron-methyl, however, 2-leaf stage of E. kuroguwai plants regrew better than 3 leaf stage of plants when treated with equal volume of bensulfuron-methyl. The critical periods of S. trifolia and E. kuroguwai growth depending upon the rhizome detachment were 12 and 18 days after sprouting, respectively. The starch stacked in the S. trifolia and E. kuroguwai tubers were exhausted at 18 and 27 days after sprouting, respectively. The highest level of sugar contents was showed at 9 days after sprouting in S. trifolia, and 18 days after sprouting in E. kuroguwai.
신규 화합물 EK-5439의 선택성 및 protoporphyrinogen oxidase 저해활성
홍경식(K. S. Hong),황인택(I. T. Hwang),김형래(H. R. Kim),전동주(D. J. Jeon),이병회(B. H. Lee),송종환(J. H. Song),조광연(K. Y. Cho) 한국농약과학회 2004 농약과학회지 Vol.8 No.2
3-Chloro-2-[4-chloro-2-fluoro-5-(5-methyl-3-phenyl-4,5-dihydroisoxazol-5-ylmethoxy)-phenyl]-4,5,6,7-tetrahydro-2H- indazole(EK-5439) demonstrated rice selectivity and herbicidal activity on annual weeds, such as Echinochloa oryzicola, Monochoria vaginalis, Lindernia pyxidaria, Rotala indica, Aneilema keisak, Cyperus difformis, and Ludwigia prostrata at doses of 16-63 g a.i./㏊. However, the application window was limited from pre-emergence to 5 days after transplanting. The control efficacy of EK-5439 on barnyardgrass was 4 times higher than that of oxadiazon. EK-5439 was excellently safe to the 16 different transplanted rice cultivars treated 2 days after transplanting. These compounds have the mechanism of action on the chlorophyll biosynthesis like protoporphyrinogen Ⅸ oxidase inhibitors.
신규 제초제 후보 화합물 EK-5439의 선택성 및 토양 중 행동특성
황인택(Hwang I.T.),홍경식(K.S. Hong),이병회(B.H. Lee),김형래(H.R. Kim),전동주(D.J. Jeon),조광연(K.Y. Cho) 한국농약과학회 2004 농약과학회지 Vol.8 No.3
The characteristics of the experimental compound EK-5439 [3-Chloro-2-[4-chloro-2-fluoro-5-(5-methyl-3-phenyl-4,5-dihydroisoxazol-5-yl-methoxy)-phenyl]-4,5,6,7-tetrahydro-2H-indazole] was investigated to characterize as a new herbicide to use in rice field. The selectivity between rice and barnyardgrass was very good when treated from 0 to 4 days after seeding under soil application. In the overflowing experiment, herbicidal efficacy of EK-5439 was stabilized 12 hrs after application. Vertical migrations in submerged paddy soil of EK-5439 and oxadiazon were equally observed below a soil depth of 1 ㎝ under 5 ㎝/day leaching condition. Half-lives for herbicidal efficacy of EK-5439 and oxadiazon were 6.1, and 9.6 days, respectively, under submerged paddy condition. EK-5439 showed rapid adsorption to the soil clay, such as bentonite.