1-iodopropargyl-3,4-disubstituted-.delta..sup.2 -1,2,4-triazolidin-5-one

Abstract

Compounds of the formula: ##STR1## wherein R is aryl or aryl substituted with 1 to 3 substituents independently selected from halogen, lower alkyl of 1 to 4 carbon atoms, lower alkoxy of 1 to 4 carbon atoms, lower alkylthio of 1 to 4 carbon atoms, nitro, cyano, --S(O).sub.n R.sup.2 wherein n is 1 or 2 and R.sup.2 is lower alkyl of 1 to 4 carbon atoms; or alkyl, cycloalkyl, lower alkenyl or lower alkynyl, all optionally substituted with 1 to 3 halogen atoms; and R.sup.1 is lower alkyl, trialkylsilylmethylene, aryldialkylsilylmethylene, aryl; aralkyl, or substituted aryl or aralkyl are fungicidal.