Patent ID: 6809065
Filing Date: 2004-10-26
Classification: A01N

Abstract:
A method of exerting a herbicidal effect on algae or weeds comprising applying a herbicide composition to algae or weeds, the herbicide composition containing, as an active ingredient, one or more substituted pyrazole derivatives represented by the following formula (I): wherein X is R1OOC, R1HNOC, R1R1NOC, a cyano group or a 5-membered or 6-membered aromatic heterocyclic group,W is an alkylene group of 1 to 3 carbon atoms or NR1, R is a lower alkyl group of 1 to 4 carbon atoms or a lower haloalkyl group of 1 to 4 carbon atoms, A, B and D may be the same or different and are each a hydrogen atom, a halogen atom or a group selected from the group consisting of R1, R1O, R1S, R1SO, R1SO2, (R1)2N, R1OOC, ROR2, R1ON&boxH;CH, a cyano group, a nitro group, a lower alkenyl group of 2 to 4 carbon atoms, a lower alkynyl group of 2 to 4 carbon atoms, a cycloalkyl group of 3 to 7 carbon atoms, Ph, PhCH2, PhO, PhCH2O, PhOR2, PhS, PhCH2S, PhSR2, PhCH2ON&boxH;CH, Naph and Het, with the proviso that there is no case where A, B and D are hydrogen atoms at the same time and there is no case where A, B and D are aromatic groups or aromatic heterocyclic groups at the same time, R1 is a lower alkyl group of 1 to 4 carbon atoms or a lower haloalkyl group of 1 to 4 carbon atoms, R2 is a lower alkylene group of 1 to 4 carbon atoms, Ph is an unsubstituted or substituted phenyl group, Naph is an unsubstituted or substituted naphthyl group, and Het is an unsubstituted or substituted, 5-membered or 6-membered aromatic heterocyclic group.