Abstract: A phthalimide represented by general formula (I): wherein L represents L-1 or L-2: (wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group, etc.); A represents an oxygen atom, a sulfur atom or —NR5— (wherein R5 is a hydrogen atom, an alkyl group, an alkenyl group, etc.); R represents a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, a phenyl group, etc.; X represents a halogen atom; Y represents a hydrogen atom or a halogen atom; and Z represents a hydrogen atom, an alkyl group, a haloalkyl group or a halogen atom. The compound exhibits excellent herbicidal effects with high selectivity.

Abstract: 1,3-Oxazin-4-one derivatives represented by general formula (I) ##STR1## wherein R.sup.1 is a lower alkyl group, a lower alkenyl group, an aryl group which may be substituted, or an aralkyl group which may be substituted;R.sup.2 is a hydrogen atom or a lower alkyl group;R.sup.3 is a lower alkyl group, an aryl group which may be substituted, or an aralkyl group which may be substituted; andR.sup.4 and R.sup.5, independently, each is a lower alkyl group, or R.sup.4 and R.sup.5, taken together with the carbon atom to which they are bonded, combine to form a 3- to 8-membered carbocyclic group which may have a branch of a lower alkyl group. These compounds have broad herbicidal spectra and potent herbicidal activities and in addition high safety to useful crops, so that they are useful as herbicides.

Abstract: A 1,3,5-triazine derivative represented by the following formula (I) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently from each other, represent a hydrogen atom or a group selected from the class consisting of linear or branched C.sub.1 -C.sub.6 alkyl groups, C.sub.2 -C.sub.6 alkenyl groups, C.sub.2 -C.sub.6 alkynyl groups, C.sub.1 -C.sub.6 alkyl groups substituted by C.sub.1 -C.sub.6 alkoxy or alkylthio, C.sub.3 -C.sub.6 cycloalkyl groups, a phenyl group unsubstituted or substituted by a substituent selected from halogen, nitro, cyano, lower alkyl, lower alkoxy, lower alkylthio and fluoro-substituted lower alkyl, C.sub.7 -C.sub.9 aralkyl groups unsubstituted or substituted by a substituent selected from halogen, nitro, cyano, lower alkyl, lower alkoxy, lower alkylthio and fluoro-substituted lower alkyl, and alkoxycarbonylmethyl groups having 1 to 6 carbon atoms in the alkoxy moiety; and Y represents a fluoro-substituted C.sub.1 -C.sub.3 alkyl group and a herbicidal use thereof.

Abstract: An acetanilide derivative of the following formula (I) and a herbicide containing one or more of the acetanilide derivative as the active ingredient are described. ##STR1## In the formula, R.sup.1 is a lower alkyl group; R.sup.2 is a fluorine-substituted lower alkyl group; A is ##STR2## B is an optionally substituted pyrazolyl group, an optionally substituted alkoxy group or a hydrogen atom.The acetanilide derivative and the herbicide have a selective weed killing activity to gramiveous weeds.

Abstract: 2-Chloro-N-(4,6-dimethoxy-5-pyrimidinyl)-N-[1-(1-pyrazolyl)ethyl]acetamide of the following formula: ##STR1## a herbicidal composition comprising a herbicidally effective amount of the compound of formula (I); and a method of controlling weeds which comprises applying a herbicidally effective amount of the formula (I) to the locus where the weeds are growing or will grow.