Annular depressions and perforations in fungal cell walls were observed on hyphae and sclerotia of Rhizoctonia solani and on conidia of Cochliobolus miyabeanus following burial of these respective fungus propagules for 4 to 8 weeks in vegetable field soils obtained from various locations in Shikoku, Japan. The annular depressions and perforations were 1.0 to 5.5ƒÊm in diameter with 1 to 7 perforations per hyphal cell or conidium. Vampyrellid Arachnula impatiens Cienkowski.
A stem rot of broccoli caused by a species of Pythium was found at Tsu city, Mie Prefecture in October 1993. The infected stems appeared white rot with aqueous edge. The morphology of sexual organs made by the isolate closely fits van der Plaats-Niterink's description of Pythium ultimum Trow var. ultimum. The isolate was pathogenic to seedlings of many crop species. This is the first report on stem rot of broccoli caused by Pythium ultimum Trow var. ultimum in Japan.
Twenty isolates of WMV collected from different locations of western Japan were examined by leaf-dip serology and immunodiffusion test. The antiserum used in this study was prepared to an isolate 8(E) which induced typical mosaic, veinbanding, leaf distortion and dwarf symptoms on cucurbits.Thirteen isolates reacted positively with the antiserum while seven isolates from Kagawa prefecture were negative.The serologically positive isolates were further classified into two groups on the basis of reactions on broadbean and garden pea; 4 isolates infected these species systemically while 9 isolates did not induce systemic infection.The isolates that did not react with the antiserum infected broadbean and garden pea systemically inducing mosaic symptoms.The two types of WMV were detected in field-infected cucurbit plants collected from Kagawa prefecture.These results indicate that there are at least two serologically distinct types of WMV in Kagawa prefeccture.
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