3-Pyridylisoxazolidine fungicides

A fungicidal composition comprising a carrier, optionally a surface-active agent, and, as active ingredient a fungicidally effective amount of at least one 3-pyridylisoxazolidine of the formula ##STR7## wherein R.sup.1 is hydrogen, alkyl or alkenyl;

• R.sup.2 is hydrogen, cyano, alkyl, alkoxy, alkoxycarbonyl, alkanoyloxy, alkylthioalkyl, cyanoalkyl, haloalkyl, hydroxyalkyl, benzyloxyalkyl, or phenyl or phenylthio optionally substituted by from one to three moieties represented by X;
• R.sup.3 is hydrogen or alkyl;
• R.sup.4 is hydrogen, alkyl, alkoxycarbonyl, cyano or phenyl optionally substituted by from one to three moieties represented by X;
• with the proviso that R.sup.1 and R.sup.3 together can represent an alkylene moiety of from one to six carbon atoms optionally substituted by alkyl;
• X is halogen, nitro, cyano, alkyl, alkoxy or phenyl;
• n is zero, one, two or three, with the further provisos that each alkyl and alkylene moiety contains from one to six carbon atoms;
• and each alkenyl moiety contains from three to six carbon atoms.