The present invention relates to a compound of formula (I): wherein the substituents are as defined herein, and wherein the compound of formula (I) is optionally present as an agrochemically acceptable salt thereof. These compounds are thought to be suitable for use as herbicides. The invention therefore also relates to a method of controlling weeds, especially grassy monocotyledonous weeds, in crops of useful plants, comprising applying a compound of formula (I), or a herbicidal composition comprising such a compound, to the plants or to the locus thereof. ##STR00001##

The present invention relates to a compound of formula (I): wherein the substituents are as defined herein, and wherein the compound of formula (I) is optionally present as an agrochemically acceptable salt thereof. These compounds are thought to be suitable for use as herbicides. The invention therefore also relates to a method of controlling weeds, especially grassy monocotyledonous weeds, in crops of useful plants, comprising applying a compound of formula (I), or a herbicidal composition comprising such a compound, to the plants or to the locus thereof. ##STR00001##

The present invention provides a compound having an excellent efficacy for controlling weeds. A dihydropyrone compound of formula (I): wherein m is 1, 2 or 3; n is an integer of any one of 1 to 5; X represents O, S, S(O) or S(O).sub.2; R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 and R.sup.3 represents a hydrogen atom, an C.sub.1-6 alkyl group and the like; when X represents S, S(O) or S(O).sub.2, R.sup.4 represents an C.sub.1-6 alkyl group, a C.sub.1-6 haloalkyl group, an C.sub.6-10 aryl group or a five- to six-membered heteroaryl group, and X represents O, S, S(O) or S(O).sub.2, R.sup.4 represents an C.sub.6-10 aryl group or a five- to six-membered heteroaryl group; G represents a hydrogen atom and the like; Z represents a halogen atom, a cyano group, a nitro group, a phenyl group, an C.sub.1-6 alkyl group and the like; is useful as an active ingredient for herbicides. ##STR00001##

The present invention provides a compound having an excellent efficacy for controlling weeds. A dihydropyrone compound of formula (I): wherein m is 1, 2 or 3; n is an integer of any one of 1 to 5; X represents O, S, S(O) or S(O).sub.2; R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 and R.sup.3 represents a hydrogen atom, an C.sub.1-6 alkyl group and the like; when X represents S, S(O) or S(O).sub.2, R.sup.4 represents an C.sub.1-6 alkyl group, a C.sub.1-6 haloalkyl group, an C.sub.6-10 aryl group or a five- to six-membered heteroaryl group, and X represents O, S, S(O) or S(O).sub.2, R.sup.4 represents an C.sub.6-10 aryl group or a five- to six-membered heteroaryl group; G represents a hydrogen atom and the like; Z represents a halogen atom, a cyano group, a nitro group, a phenyl group, an C.sub.1-6 alkyl group and the like; is useful as an active ingredient for herbicides. ##STR00001##

Disclosed are compounds of Formula I and N-oxides or salts thereof, wherein R.sup.1 is C.sub.1-C.sub.4alkyl or C.sub.3-C.sub.6cycloalkyl; R.sup.2 is H, Cl, Br or I; R.sup.3 is Cl or OR.sup.4; R.sup.4 is H or C.sub.1-C.sub.4 alkyl; R.sup.5 is H, F, Cl or CH.sub.3; and R.sup.6 is H or Cl. Also disclosed is a composition containing a compound of Formula I, and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound of Formula I or a composition thereof. Also disclosed are methods for preparing a compound of Formula I.

##STR00001##

Disclosed are compounds of Formula I and N-oxides or salts thereof, wherein R.sup.1 is C.sub.1-C.sub.4alkyl or C.sub.3-C.sub.6cycloalkyl; R.sup.2 is H, Cl, Br or I; R.sup.3 is Cl or OR.sup.4; R.sup.4 is H or C.sub.1-C.sub.4 alkyl; R.sup.5 is H, F, Cl or CH.sub.3; and R.sup.6 is H or Cl. Also disclosed is a composition containing a compound of Formula I, and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound of Formula I or a composition thereof. Also disclosed are methods for preparing a compound of Formula I.

##STR00001##

What are described are compounds of the general formula (I) and agrochemically acceptable salts thereof

##STR00001##

and their preparation and their use in the crop protection sector.

Use of the compounds of the formula (I) wherein the substituents are as defined herein as herbicides. Compounds of formula (I) are also claimed.

##STR00001##

Use of the compounds of the formula (I) wherein the substituents are as defined herein as herbicides. Compounds of formula (I) are also claimed.

##STR00001##

In crop production in the fields of agriculture, horticulture and the like, the damage caused by insect pests etc. is still immense, and insect pests resistant to existing insecticides have emerged. To solve the problems, the present invention has been made, and an object of the present invention is to develop and provide a novel agricultural and horticultural insecticide. The present invention provides a heterocycle-bound condensed heterocyclic compound represented by the general formula (1): ##STR00001##
{wherein R.sup.1 represents an ethyl group, R.sup.2 represents a haloalkyl group, A.sup.1 represents a N-methyl group, A.sup.2 and A.sup.3 represent a nitrogen atom, n represents 1, m represents 2, and Q represents an oxadiazole}, or a salt thereof; an agricultural and horticultural insecticide comprising the compound or a salt thereof as an active ingredient; and a method for using the insecticide.