Elaine M. Davison

Learn More
Isozyme analysis has been used to confirm that a Cryphonectria isolated from root cankers of Eucalyptus rnarginata in Western Australia is C. cubensis, and that an Endothiella, which is common on eucalypts in southwestern Australia, and which was previously named as Endothia havanensis, is E. gyrosa.
Phytophthora inundata was found associated with a dead Xanthorrhoea preissii in Eucalyptus marginata (jarrah) forest in the south-west of Western Australia in January 2005. The isolate was sterile in pure culture and when paired with tester isolates of A1 and A2 mating types of other Phytophthora species. Mature sporangia were produced in 4 hours and(More)
A small survey of the potting mix taken from 15 consignments of nursery grown plants imported into Western Australia from other states in Australia found that Phytophthora spp. were present in 10% of the samples and Pythium spp. were present in 25% of the samples. Plant pathogenic nematodes were isolated from 12 of 13 consignments. Potting mix appears to be(More)
Cavity spot lesions on mature carrots from growers’ properties, and mature and maturing carrots from a disease nursery, were sampled for Pythium spp. Over 98% of the isolates were P. sulcatum; other species isolated were P. irregulare and Pythium ‘D’. P. coloratum was not found. In vitro pathogenicity tests on carrots showed that isolates of P. sulcaturn(More)
Pythium tracheiphilum, the cause of lettuce stunt, wilt and leaf blight, was recorded for the first time in Australia in July 2005, on gourmet lettuce at two farms at Gingin, near Perth, Western Australia. A subsequent survey of commercial lettuce crops failed to find symptoms of lettuce wilt and leaf blight at additional properties, and P. tracheiphilum(More)
Novel species of microfungi described in the present study include the following from South Africa: Camarosporium aloes, Phaeococcomyces aloes and Phoma aloes from Aloe, C. psoraleae, Diaporthe psoraleae and D. psoraleae-pinnatae from Psoralea, Colletotrichum euphorbiae from Euphorbia, Coniothyrium prosopidis and Peyronellaea prosopidis from Prosopis,(More)
The host range of Pythium sulcatum, the cause of cavity spot disease of carro ts in most carrot-growing regions of Australia, was determined by growing seedlings in infested soil in the field. P. sulcatum was isolated from roots of carrots and other members of the family Apiaceae, but not from vegetables from other plant families and grasses. Control by(More)
inflorescences and the central stem elongates, the disease spreads upward to the cauline leaves which have longer petioles and smaller blades. Smallest leaves and flower sepals are frequently attacked. Under wet, shaded conditions, stems become necrotic and turn black. Affected plants flower poorly, are heavily spotted and suffer premature death. Diseased(More)
The name jarrah dieback has been used for two different disorders, leading to considerable confusion. It was coined in the 1940s to describe the sudden death of groups of jarrah (Eucalyptus marginata) trees in south western Western Australia, which occurred on poorly drained sites, following exceptionally heavy rainfall. In the 1960s these sites were shown(More)
The name jarrah dieback was used in the 1940s to describe a serious economic problem in the jarrah forest in the south west of Western Australia. This was the sudden death of groups of jarrah (Eucalyptus marginata) trees that occurred on previously logged sites that had a tendency to become waterlogged in winter. Although the cause was not determined at the(More)