Dihydropyridazinones, pyridazinones and related compounds as fungicides

A compound of the formula ##STR91## wherein the compound is a six member ring;

• and A is --(CHR.sup.2).sub.n --CHR.sup.7 --Z--;
• --CR.sup.2 .dbd.CR.sup.7 --Z--;
• CHR.sup.2 --CR.sup.7 .dbd.Y-- or --CR.sup.2 .dbd.CR.sup.2 Y.dbd.;
• D is nitrogen;
• Q is an aromatic group selected from ##STR92## Z is carbonyl (C.dbd.O), or thiocarbonyl (C.dbd.S);
• Y is carbon substituted by halo, alkoxy, alkynylthio or triazolyl;
• wherein
• (i) R.sup.1 is alkynyl, haloalkynyl, phenylalkynyl, heterocyclyl, dialkynyl, heterocyclylalkynyl, cycloalkylalkynyl, alkenylalkynyl, hydroxyalkynyl, alkoxyalkynyl, alkanoyloxyalkynyl, formylalkynyl, trialkylsilylalkynyl, trialkyltinalkynyl, haloalkenylalkynyl, carboxyalkynyl, or alkoxycarbonylalkynyl;
• R.sup.2 is hydrogen, (C.sub.1 -C.sub.3)alkyl, phenyl, or halogen;
• R.sup.7 is hydrogen, (C.sub.1 -C.sub.3)alkyl, phenyl, halogen, alkynylalkenyl, alkynyl, dialkynyl, haloalkynyl, or alkenylalkynyl;
• R.sup.3 and R.sup.6 are each independently hydrogen, alkoxy or halogen;
• R.sup.4 is hydrogen, halogen, alkoxy or nitro;
• R.sup.5 is hydrogen, halogen, nitro, alkyl, alkoxy, alkylthio, haloalkyl, haloalkoxy, haloalkylthio, phenyl, phenoxy or cyano;
• or
• R.sup.2 and R.sup.3 together form a (C.sub.1 -C.sub.3)alkyl;
• or
• R.sup.2 and R.sup.7 together form a fused phenyl ring and R1, R3, R4, R5 and R6 are as above;
• n is 1;
• and
• agronomically acceptable salts thereof.