Abstract: Novel N'-phenyl-N-methylurea derivatives of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom, a methyl group or a methoxy group, R.sub.2 is a hydrogen atom or a lower alkyl group, R.sub.3, which may be the same or different, is a halogen atom, a lower alkyl group, a lower alkoxy group, a lower alkylthio group or a trifluoromethyl group, n is an integer of 0 to 5, X is a hydrogen atom or a halogen atom, Y is an oxygen atom or a sulfur atom and Z is a straight or branched C.sub.1 -C.sub.8 alkylene group which may have no less than one atom of oxygen and/or sulfur at the terminal of and/or inside the carbon chain, which shows a pronounced herbicidal activity against a wide variety of weeds in the cultivation of crop plants as well as a notable fungicidal activity agaist a wide variety of phytopathogenic fungi causing plant diseases to crop plants without any material toxicity to mammals and fish or chemical injury to said crop plants.

Abstract: A compound of the formula: ##STR1## wherein R is a lower alkyl group substituted with two or three fluorine atoms and X is a halogen atom, a lower alkyl group or a trifluoromethyl group, which is useful as a herbicide against a variety of weeds with a high selectivity to cotton, wheat and rice plants.

Abstract: A compound of the formula: ##STR1## wherein R is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, X is a C.sub.3 -C.sub.4 alkylene group or a C.sub.3 alkenylene group, Y is a hydrogen atom or a chlorine atom, A is a methyl group or a methoxy group and the substituted ureido group is present at the m- or p-position to the group of the formula: ##STR2## which is useful as a herbicide.

Abstract: A compound of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, which may be same or different, are each hydrogen or C.sub.1 -C.sub.4 alkyl, X is chlorine or bromine, Y is hydrogen, chlorine, bromine, fluorine or iodine and Z is N,N-dimethylamino, N-methoxy-N-methylamino, C.sub.1 -C.sub.4 alkyl or C.sub.3 -C.sub.6 cycloalkyl, which is useful as a herbicide.

Abstract: A herbicidal composition exerting an enhanced herbicidal activity against various weeds including broad-leaved weeds and Gramineae grasses without any phytotoxicity to soybean, which comprises as an active ingredient N'-[4-(4-methylphenethyloxy)phenyl]-N-methoxy-N-methylurea and as a potentiating agent at least one compound of the formula: ##STR1## and their salts, esters and amides.

Abstract: Novel N'-4-(2-naphthyloxy)phenyl-N-methylurea derivatives of the formula: ##STR1## wherein X is a hydrogen atom, a halogen atom or a trifluoromethyl group and R is a methyl or methoxy group having a herbicidal activity, particularly effective in exterminating weeds in the cultivation of soybean and gramineous crops such as wheat and barley, and/or having a fungicidal activity especially effective in controlling the rust of wheat and barley.

Abstract: Oximecarbamate derivatives of the formula: ##STR1## wherein R.sub.1 is methyl or methoxy, R.sub.2 is lower alkyl, lower alkoxy, methylenedioxy, methylthio, halogen or trifluoromethyl, R.sub.3 is hydrogen, methyl or ethyl, X and Z are each oxygen or sulfur, m is an integer of 0 to 5 when R.sub.2 is fluorine or an integer of 0 to 3 when R.sub.2 is other than fluorine, R.sub.2 being same or different in case of m being an integer of 2 or 3, n and r are each an integer of 0 or 1 but when one of them is zero, the other is not zero, q is an integer of 0 or 1 and t is an integer of 0 to 4, which are useful as herbicides having high selectivity to crop plants.

Abstract: Novel N'-phenyl-N-methylurea derivatives of the formula: ##STR1## wherein R is a C.sub.4 -C.sub.10 cycloalkyl group, a C.sub.4 -C.sub.10 cycloalkenyl group, a C.sub.4 -C.sub.10 cycloalkyl group condensed with a benzene ring or substituted with at least one C.sub.1 -C.sub.4 alkyl group or a C.sub.4 -C.sub.10 cycloalkenyl group condensed with a benzene ring or substituted with a C.sub.1 -C.sub.4 alkyl group, Z is a C.sub.1 -C.sub.4 alkylene group which may have an atom of oxygen and/or sulfur at the terminal of and/or inside the carbon chain, Y is an oxygen atom or a sulfur atom, A is a hydrogen atom, a methyl group or a methoxy group and n is an integer of 0 or 1 with the proviso that in the chain consisting of --(Z).sub.n --Y--, oxygen and/or sulfur atoms can not be present in succession, which shows a pronounced herbicidal activity against a wide variety of weeds in the cultivation of crop plants without any material toxicity to mammals and any chemical injury to said crop plants.

Abstract: 3-Thiooxo-5-oxo-hexahydro-1,2,4-triazine, which is useful as a herbicide and/or fungicide.

Abstract: A herbicidal composition which comprises as an active ingredient a herbicidally effective amount of a triazinone compound of the formula: ##STR1## wherein A is --NH--N.dbd.CHCH.sub.2 NH--, --NH--NHCH.sub.2 CH.sub.2 NH-- or --NH--N.dbd.CHC(NHOH).dbd.N--, and an inert carrier.

Abstract: A compound of the formula: ##STR1## wherein A is a hydrogen atom, a methyl group or a methoxy group, X is a straight or branched C.sub.1 -C.sub.4 alkylene chain, Y is an oxygen atom or a sulfur atom, R, which may be the same or different, is a lower alkyl group, a lower alkoxy group, a trifluoromethyl group, a chlorine atom, a bromine atom or a fluorine atom, m is an integer of 0 to 5 and n is an integer of 0 or 1, provided that in case of R being a fluorine atom, m is an integer of 0 to 5 and in case of R being other than a fluorine atom, m is an integer of 0 to 3, which shows a pronounced herbicidal activity against a wide variety of weeds in the cultivation of crop plants without any material toxicity to mammals and any chemical injury to said crop plants.

Abstract: Oximecarbamate derivatives of the formula: ##STR1## wherein R.sub.1 is methyl or methoxy, R.sub.2 is lower alkyl, lower alkoxy, methylenedioxy, methylthio, halogen or trifluoromethyl, R.sub.3 is hydrogen, methyl or ethyl, X and Z are each oxygen or sulfur, m is an integer of 0 to 5 when R.sub.2 is fluorine or an integer of 0 to 3 when R.sub.2 is other than fluorine, R.sub.2 being same or different in case of m being an integer of 2 or 3, n and r are each an integer of 0 or 1 but when one of them is zero, the other is not zero, q is an integer of 0 or 1 and t is an integer of 0 to 4, which are useful as herbicides having high selectivity to crop plants.

Abstract: Novel N'-phenyl-N-methylurea derivatives of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom, a methyl group or a methoxy group, R.sub.2 is a hydrogen atom or a lower alkyl group, R.sub.3, which may be the same or different, is a halogen atom, a lower alkyl group, a lower alkoxy group, a lower alkylthio group or a trifluoromethyl group, n is an integer of 0 to 5, X is a hydrogen atom or a halogen atom, Y is an oxygen atom or a sulfur atom and Z is a straight or branched C.sub.1 -C.sub.8 alkylene group which may have no less than one atom of oxygen and/or sulfur at the terminal of and/or inside the carbon chain, which shows a pronounced herbicidal activity against a wide variety of weeds in the cultivation of crop plants as well as a notable fungicidal activity against a wide variety of phytopathogenic fungi causing plant diseases to crop plants without any material toxicity to mammals and fish or any chemical injury to said crop plants.

Abstract: Use of 3,5-dioxo-1,2,4-triazine derivatives of the formula: ##STR1## wherein X, Y, R.sup.1 and R.sup.2 are each as defined in the specification, as a herbicidal agent exerting a strong controlling and preventing effect against wild oats without any material phytotoxicity to wheat.

Abstract: Novel N'-4-(2-naphthyloxy)phenyl-N-methylurea derivatives of the formula: ##STR1## wherein X is a hydrogen atom, a halogen atom or a trifluoromethyl group and R is a methyl or methoxy group having a herbicidal activity, particularly effective in exterminating weeds in the cultivation of soybean and gramineous crops such as wheat and barley, and/or having a fungicidal activity especially effective in controlling the rust of wheat and barley.

Abstract: A compound of the formula: ##STR1## wherein A is a hydrogen atom, a methyl group or a methoxy group, Rs are same or different and each a halogen atom, a lower alkyl group, a lower alkoxy group, a lower alkylthio group, a trifluoromethyl group, a cyano group or a methylenedioxy group, X is a hydrogen atom or a halogen atom, Y is an oxygen atom or a sulfur atom, Z is a lower alkylene group and n is an integer of 0 to 3, provided that the substituted ureido group being present at the m- or p-position to the substituent represented by the symbol X and at the same time at the m- or p-position to the substituent represented by the symbol Z, which shows herbicidal and/or fungicidal activities and can be prepared, for instance, by reacting the corresponding phenyl isocyanate with a reagent of the formula: ##STR2## wherein A is as defined above.

Abstract: A compound of the formula: ##STR1## wherein R is a methyl group or an ethyl group shows a strong herbicidal activity against a wide variety of weeds without any material chemical injury to crop plants.

Abstract: An N'-phenyl-N-methyl-urea derivative of the formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are each hydrogen, lower alkyl, lower alkoxy, lower alkylthio, halogen or trifluoromethyl, R.sup.4 is hydrogen or lower alkyl, A is methyl or methoxy, X is oxygen or sulfur, Y is hydrogen or halogen, Z is a straight or branched alkylene chain having not more than 8 carbon atoms which may have no less than one atom of oxygen and/or sulfur inside and/or at the end of the alkylene chain and n is an integer of 1 to 3, which shows a pronounced herbicidal activity against a wide variety of weeds in the cultivation of crop plants without any material toxicity to mammals or fish or any chemical injury to said crop plants.

Abstract: N-(4-Benzyloxyphenyl)-N'-methyl-N'-methoxyurea of the formula: ##STR1## which shows a pronounced herbicidal activity against weeds in the cultivation of soybean without any material toxicity to mammals and soybean plants.

Abstract: An N'-[4-(substituted phenethyloxy)phenyl]-N-methyl-N-methoxyurea of the formula: ##STR1## wherein X.sub.1 is a hydrogen atom or a methyl group and X.sub.2 is a C.sub.1 -C.sub.5 alkyl or a C.sub.1 -C.sub.5 alkoxy group, which shows a pronounced herbicidal activity against a wide variety of weeds in the cultivation of soybean, peanut, cotton, corn, wheat or rice plants without any material toxicity to mammals, fishes and said crop plants.