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Inhibition of protoporphyrinogen oxidase activity and selectivity of new compound EK-5439  

Hong, K.S. (Korea Research Institute of Chemical Technology)
Kim, H.R. (Korea Research Institute of Chemical Technology)
Jeon, D.J. (Korea Research Institute of Chemical Technology)
Lee, B.H. (Korea Research Institute of Chemical Technology)
Song, J.H. (Korea Research Institute of Chemical Technology)
Cho, K.Y. (Korea Research Institute of Chemical Technology)
Hwang, I.T. (Korea Research Institute of Chemical Technology)
Publication Information
The Korean Journal of Pesticide Science / v.8, no.2, 2004 , pp. 79-87 More about this Journal
Abstract
3-Chloro-2-[4-chloro-2-fluoro-5-(5-methyl-3-phenyl-4,5-dihydroisoxazol-5-ylmethoxy)-phenyl]-4,5,6,7-tetrahy dro-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./ha. 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.
Keywords
annual weed; application window; rice herbicide; spectrum; transplanting;
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