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- Title
<em>Acrocalymma medicaginis</em> and <em>Phomopsis</em> sp. as causal agents of crown rot of lucerne in Australia.
- Authors
Nikandrow, A.
- Abstract
Fungi associated with crown rotting were isolated from 3 year-old lucerne plants growing in sandy and loam soils in an irrigated stand, declining in productivity, at Langhorne Creek, South Australia. The method of isolation markedly affected the range of species recovered. Fusarium spp. and Phomopsis sp. were isolated from washed and surface sterilized crowns, whereas a larger range of fungi, especially Acrocalymma medicaginis, was isolated from unwashed crowns. A medicaginis was most frequently isolated from rotted tissue flecked with red, while a species of Phomopsis was the dominant fungus in whitish tissue containing zone lines, especially in crown branches. A. medicaginis and Phomopsis sp. caused crown rotting of mature, wounded lucerne plants at temperatures equivalent to summer conditions at Langhorne Creek. There was no evidence that Fusarium oxysporum or F. solani, two of the most frequently isolated species, were pathogens of mature lucerne plants.
- Subjects
SOUTH Australia; ALFALFA diseases &; pests; HOST plants for phytopathogenic microorganisms; FUSARIUM; PHOMOPSIS; PLANT-pathogen relationships; PHYTOPATHOGENIC fungi; PLANT disease research
- Publication
Journal of Phytopathology, 1990, Vol 130, Issue 1, p24
- ISSN
0931-1785
- Publication type
Article
- DOI
10.1111/j.1439-0434.1990.tb01150.x