Abstract
Abstract A description is provided for Burkholderia gladioli pv. gladioli . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Crocus spp., Freesia hybrida, F. refracta, Gladiolus colvillei, G. hortulanus, Iris spp., Ixia maculata and Tigridia pavonia . In addition the same organism has been reported to infect various ferns, including Asplenium nidus, Platycerium bifurcatum, Pteris cretica, P. ensiformis, Adiantum sp., Cyrtomium falcatum, Davallia fejeensis, Pelleae rotundifolia (63, 3386; 64, 216). Orchids of the genus Dendrobium are also thought to be susceptible (63, 5459). DISEASE: Rot of stem bases and corms of gladioli; leaf spots and blight of ferns. Leaves begin dying at the tip, initially spots are reddish in colour becoming enlarged and circular and darkening to dark brown to black. Yellow or orange sunken spots develop on the corm. Severity of the disease may be enhanced by the actions of the root knot nematode, Meloidogyne javanica (53, 3055), bulb mites and possibly grub and wireworm injury. Young tissue appears to be the most susceptible. GEOGRAPHICAL DISTRIBUTION: South Africa, Zimbabwe, China, Japan, Thailand, Australia (NT, NSW, Qd., S. Aust., Tas., WA, Vict.), New Caledonia, Belgium, Czechoslovakia, Finland, Germany, Italy, Netherlands, Romania, USA (widespread), Canada (Ontario, British Columbia), Argentina. TRANSMISSION: By the movement of infected corms.
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