Abstract
Abstract A description is provided for Pythium acanthophoron . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Ananas sativus, Brassica chinensis, Cicer arietinum, Daucus carota, Eucalyptus regnans, Gossypium sp., Larix sp., Lolium perenne, Phaseolus vulgaris, Pinus sp., Trifolium subterraneum . In artificial infections: Absidia glauca, Basidiobolus ranarum, Entomophthora coronata, Fusarium solani, Mucor hiemalis, Pythium myriotylum . Also in soil around ginger and bedding plants, and in sand dunes. DISEASE: Leaf rot of pineapple, root rot of beans (61, 3765), and a range of other non-specific root rots, although the fungus seems only weakly pathogenic to most plant hosts; a facultatively necrotrophic plant pathogen and also a mycoparasite. It seems to have a more important role as a mycoparasite, particularly of Zygomycetes , and may be present around roots, parasitizing root infecting fungi. GEOGRAPHICAL DISTRIBUTION: Asia; China (Guangdong), India, Japan, Philippines. Australasia & Oceania; Australia (Vic., WA). Europe; UK (Scotland, Wales). North America; USA (Hl). TRANSMISSION: Presumably by mycelial growth in moist infected soils. Oospores and zoosporangia have been shown to survive in soil rather than in plant debris (62, 802), and serve as perennating structures. Oospores may be dispersed by wind from dry soil.
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