Abstract: The invention relates to new phenanthrene derivatives wherein R stand for C.sub.1-10 alkylamino; C.sub.1-10 alkylthio; C.sub.1-5 alkoxy; or phenyl or phenylamino, the two latter groups being optionally substituted on the phenyl ring by one or more identical or different C.sub.1-4 alkyl, C.sub.1-4 alkoxy, nitro, amino, cyano and/or halogen substituent(s) .The compounds of the present invention possess valuable fungicidal properties and may be used in agriculture, horticulture and therapy as active ingredient of fungicidal or antifungal compositions.The compounds of the general Formula I ##STR1## may be prepared by acylating 9,10-phenanthrene-dione-9-oxime or an alkali or alkali earth metal salt thereof.

Abstract: The invention relates to a method of combatting phytopathogenic fungi, primarily powdery mildew. The method involves administering compositions according to the invention which contain as active principle at least one compound of the formula (I), ##STR1## wherein R.sup.1 is a C.sub.1-12 alkyl or a chloroethyl group,R.sup.2 is hydrogen, halogen, a C.sub.1-4 alkyl, a C.sub.1-4 alkoxy or nitro group,R.sup.3 is hydrogen, halogen, a C.sub.1-4 alkyl or nitro group, andR.sup.4 is hydrogen, halogen, a C.sub.1-4 alkyl or nitro group, or an acid addition salt thereof.

Abstract: Compounds of the formula, ##SPC1##WhereinR.sup.1 and R.sup.2 each stand for hydrogen or a group of the generalformula --(CH.sub.2).sub.n --SO.sub.3 H,n is an integer between 1 and 5, andR.sup.3 stands for an alkyl group,As well as the salts and quaternary salts thereof have been prepared by various methods. The new compounds according to the invention possess valuable fungicidal and/or ovicidal properties, and can be used as active ingredients of plantbiological compositions, cosmetics and pharmaceuticals, respectively.