Abstract: A substituted anilide derivative represented by the formula (2): ##STR1## wherein A and B are methyl, and X is a hydrogen atom. The substituted anilide can be used to prepare a substituted carboxanilide derivative that exhibits a disease control effect against Botrytis cinerea, Powdery mildew, Pyricularia oryzae of rice plant and other various plant diseases, is excellent in residual effect, has activity against strains that are resistant to conventional chemicals, is safe for crops, and thus is useful as a plant disease control agent.

Abstract: A substituted carboxanilide derivative represented by the formula (1): ##STR1## wherein A is a hydrogen atom or methyl, B is a methyl or ethyl, and Het is 1-methyl-3-substituted-4-pyrazolyl or 2-methyl-4-substituted-5-triazoyl group, exhibits a disease control effect against Botrytis cinerea, Powdery mildew, Pyricularia oryzae of rice plant and other various plant diseases, is excellent in residual effect, has also activity against resistant strain for conventional chemicals, particularly exerts control effects against Botrytis cinerea at a lower dosage as compared with a prior art, is also safe for crops, and thus is useful as a plant control agent.

Abstract: A novel substituted thiophene derivatives represented by the formula (1) in the invention: ##STR1## wherein R is a straight or branched alkyl group having 3-12 carbon atoms, straight or branched halogenoalkyl group having 3-12 carbon atoms, straight or branched alkenyl group having 3-10 carbon atoms, straight or branched halogenoalkenyl group having 3-10 carbon atoms, or cycloalkyl group having 3-10 carbon atoms, the cycloalkyl group being unsubstituted or substituted with an alkyl group having 1-4 carbon atoms, R and --NHCOAr are adjacent to each other, and Ar is a heterocyclic group; have excellent control activity on various plant disease such as Gray mold, Powdery mildew, Blast and Rust, and are useful as a plant disease control agent due to outstanding residual effect on Botrytis cinerea and excellent effect on Gibberella zeae.

Abstract: The substituted thiophene derivative of the invention which is represented by the general formula (1) has a broad disease spectrum for a pathogenic fungus of various crops, exhibits an excellent controlling effect on disease such as gray mold, powdery mildew and rust in particular, and is also effective for a resistant fungus of conventional fungicides which has become a serious problem, and consequently is useful for an agricultural and horticultural fungicide.

Abstract: Disclosed herein are thiocyanopyrimidine derivatives represented by the following general formula: ##STR1## wherein R means an alkyl group having 1-3 carbon atoms and X denotes a halogen atom, their production process, and agricultural and horticultural fungicides containing same as active ingredients. The compounds of this invention can provide ideal agricultural and horticultural fungicides, since they exhibit outstanding fungicidal activities against plant pathogens led by late blight and downy mildew, their toxicity to animals are low and they are not phytotoxic.The compounds of this invention can be obtained by reacting pyrimidine derivatives represented by the following general formula: ##STR2## with thiocyanates while using an organic acid as a solvent. Good results can be obtained particularly when formic acid is used as a solvent.

Abstract: Disclosed herein are thiocyanopyrimidine derivatives represented by the following general formula: ##STR1## wherein R means an alkyl group having 1-3 carbon atoms and X denotes a halogen atom, their production process, and agricultural and horticultural fungicides containing same as active ingredients. The compounds of this invention can provide ideal agricultural and horticultural fungicides, since they exhibit outstanding fungicidal activities against plant pathogens led by late blight and downy mildew, their toxicity to animals are low and they are not phytotoxic.The compounds of this invention can be obtained by reacting pyrimidine derivatives represented by the following general formula: ##STR2## with thiocyanates while using an organic acid as a solvent. Good results can be obtained particularly when formic acid is used as a solvent.

Abstract: Substituted propargyloxyacetonitrile derivative represented by the general formula (I) ##STR1## wherein R represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower haloalkyl group, a lower alkoxy group, a methylenedioxy group, a nitro group or a cyano group, n represents an integer of 1 to 5 and when n is an integer of 2 or more, R's may be identical or different, R.sup.1 represents a hydrogen atom or a lower alkyl group, and R.sup.2 represents a hydrogen atom, a lower alkyl group, a lower haloalkyl group or a halogen atom, provided that R.sup.1 and R.sup.2 are not simultaneously hydrogen atoms.The compounds have herbicidal and fungicidal activities.