Abstract
Abstract A description is provided for Pythium mamillatum . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Ageratum houstonianum, Agrostis stotonifera, Allium cepa, Ananas comosus, Antirrhinum majus, Aquilegia caerulea, Avena sativa, Beta vulgaris, Brassica nigra, B. oleracea, Citrullus vulgaris, Collinsia bicolor, Cucumis sativus, Festuca duriuscula, Geum chiloense, Gossypium sp., Linum usitatissimum, Medicago sativa, Papaver somniferum, Pelargonium spp., Pisum sativum, Saccharum officinarum, Triticum aestivum, Viola tricolor and in soil. Also on algae ( Cladophora sp., Glorocapsa sp.) on inoculation. DISEASE: Causes damping-off of seedlings and root rot of various hosts including the following crops, cauliflower, cotton, cocumber, flax, lucerne, mustard, oats, onion, pineapple, sugar beet, sugarcane and wheat. GEOGRAPHICAL DISTRIBUTION: Africa (Central African Republic); Australasia & Oceania (Australia, Hawaii); Europe (Germany, Great Britain, Netherlands, Sweden); North America (U.S.A.). TRANSMISSION: Soil-borne. Abundant in sandy nursery soils (44, 52). The pathogen has a restricted role as a pioneer colonizer of cultivated soil, surviving in organic matter as hyphal resting bodies (Barton, 1961). Oospore germination in response to exudates from living seedlings has also been demonstrated (Barton, 1957).
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