Nitrogen-containing heterocyclic compounds and compositions for controlling and/or preventing pests and blights (diseases)

A 4(3H)-pyrimidinone compound having the following formula:

• ##STR76## wherein R.sup.1 represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or a cycloalkyl group having 3 to 8 carbon atoms;
• R.sup.2 represents hydrogen atom, an alkyl group having 1 to 5 carbon atom, an alkoxy group having 1 to 5 carbon atoms, an alkylthio group having 1 to 5 carbon atoms or a phenyl group, and,
• R.sup.1 and R.sup.2 together form a member of ##STR77## X represents halogen atom, an alkyl group having 1 to 5 carbon atoms, a phenyl group, a benzyl group, or an alkoy group having 1 to 5 carbon atoms;
• Y represents an oxygen atom or sulfur atom;
• A represents ##STR78## or --CH.sub.2 --CH.sub.2 --O--, R.sup.3 and R.sup.5 represent hydrogen atom or an alkyl group having 1 to 5 carbon atoms;
• Q represents a phenyl group having substituents or pyridine which may have substituents wherein substituents for Q are selected from the group consisting of halogen atom, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an alkyloxy group having 1 to 10 carbon atoms, a haloalkyl group having 1 to 5 carbon atoms, an alkoxyalkyl group having 2 to 5 carbon atoms, a cyanoalkyl group having 2 to 5 carbon atoms, ##STR79## wherein W represents halogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or a haloalkyl group having 1 to 5 carbon atoms, and m represents zero or an integer of from 1 to 4, said W being the same or different when m is an integer of 2 to 4, the number of said substituents being from 1 to 4 and said substituents being the same or different when the number thereof is 2, 3 or 4.