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INTRODUCTION In this Fourth Supplement (to NZ. Dep. sci. industr. Res. Bull, 10 1) are listed 95 diseases on 114 host plants. It includes new records, additional host records, and diseases recorded in publications since the preparation of the Third Supplement (Brien and Dingley 1957). New records include Alternaria dianthicola on Dianthus caryophyllus and Fusarium bulbigenum var. batatas on Ipomoea batatas, while additional host records contain Phytophthora cinnamomi on a number of host plants and Puccinia iridis on nine species of Iris. Diseases of some importance which have been recorded since the Third Supplement are Ustilago violaceae, Septoria passiflorae, shell-bark virus, citrus exocortis virus and citrus tristeza virus.

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In Auckland during the past five years Fusarium oxysporum Schlecht has been consistently isolated by one of the authors (F.M.R-M.) from milky lesions on great toe nails. A few reports of similar infections have been recorded elsewhere, but from observations on over 50 cases it is possible to recognize that this fungus in man produces a highly characteristic type of onychomycosis.The occurrence in nature of Fusarium species, clinical appearance and treatment, isolation and identification of F. oxysporum and possibie mode of infection are discussed.

Sixteen fungi are described from New Zealand material; the occurrence of 10 of these species has already been noted (Dingley 1969), but 6 species are new recordings from this country. These are Peronospora manshurica (Naoum.) Syd. ex Gaum. on soybean (Glycine max (L.) Merr.), Taphrina betulina Rostr. on silver birch (Betula pendula Roth.), Diplocarpon earlianum (Ell. & Ever.) Wolf on strawberry leaves (Fragaria sp. cult.), Phoma apiicola Kleb. on celery (Apium graveolens L. var. dulce (Mill.) Pers.), Cercoseptoria l7eriella (Sacc.) comb. nov. on leaves of oleander (Nerium oleander L.), and Alternaria alternata (Fr.) Keissler f.sp. fragaria nJ.sp., which is described as causing a leaf spot on some varieties of strawberry.