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  • 1
    Electronic Resource
    Electronic Resource
    Culture in vitro of Rhododendron and Erysiphe sp. (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 44 (1995), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Successful dual cultures of a powdery mildew pathogen and Rhododendron ponticum plantlets were achieved using a tissue culture technique. Sporulation was observed within 1 week of inoculation. Comparative in vitro cultures were grown at 10, 15 and 20°C with host tissue transferred to fresh media at 2-monthly intervals. Viable conidia capable of infecting host tissue in vivo were obtained from cultures maintained at 10 and 15°C after culture for more than 6 months. Isolates from three sources (Auchincruive, Benmore and Perth) were introduced into culture. Cultures inoculated with Perth and Benmore isolates exhibited increased host growth at 10 and 15°C, respectively compared with control plantlets. These effects may result from pathogen-induced changes to host regulatory metabolism. The culture technique allows the long-term maintenance of pathogen cultures under sterile conditions without requiring subculture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1995.tb02787.x
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of isolates derived from single resting spores of Plasmodiophora brassicae and studies of their interaction (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 31 (1982), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A technique for inoculation of Brassica seedlings with single resting spores of Plasmodiophora brassicae is described. Three isolates derived from single spores were produced from one population of P. brassicae. They gave different reactions with the European Clubroot Differential (ECD) series, and two gave different reactions from those of the spore suspensions from which they were derived. When two isolates were mixed together, spores of one isolate restricted infection by spores of the other isolate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1982.tb01274.x
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of Thiahendazole on Verticillium Wilt of Lucerne (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 21 (1972), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Experiments using thiabendazole (2-(4-thiazolyl) benzimidazole) for thé control of Verticillium albo-atrum in lucerne are described. In in vitro tests thiabendazole completely inhibited fungal growth. In the glasshouse, spray treatments were ineffective but a soil drench treatment using 50 p.p.m. of active ingredient proved the most effective. In some other treatments phytotoxicity was observed. In most cultivars in a field trial there appeared to be a cumulative reduction in wilt development with further applications of fungicide: in cvs. Du Puits, Europe, Flamande and Provence the reduction occurred more quickly than in Cardinal, Emeraude, Eynsford and FD100.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1972.tb01743.x
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  • 4
    Electronic Resource
    Electronic Resource
    Field Reaction of Swede Cultivars to Turnip Crinkle Virus (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 24 (1975), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1975.tb01854.x
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  • 5
    Electronic Resource
    Electronic Resource
    Factors affecting tests for differential pathogenicity in populations of Plasmodiophora brassicae (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 31 (1982), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Factors affecting the use of the European Clubroot Differential (ECD) series for determining the differential pathogenicity of Plasmodiophora brassicae were studied. Replicate tests made with one collection of P. brassicae did not give consistent results. Collections were shown to be heterogeneous for differential pathogenicity. Selection of components of a collection occurred during passage through a range of differential host cultivars. ECD host 06 was shown not to be uniform. There was a linear relationship between the logarithm of spore concentration in the inoculum used in tests and the incidence of disease, and some ECD hosts required a higher concentration of spores than others to give the same incidence of disease. The implications of these findings for the future use of the ECD series are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1982.tb01273.x
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of temperature on colony growth by Erysiphe sp. infecting Rhododendron (1998)
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Plant pathology 47 (1998), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The growth and reproduction of powdery mildew pathogens is generally encouraged by increasing temperatures, up to 25°C. Germination and germ tube extension of Erysiphe sp. on Rhododendron cv. Elizabeth were optimal at 20°C for conidia originally formed at either 10 or 15°C. During a 50-day period of colony growth, the viability of conidia formed at 15°C declined but for those formed at 10°C it increased. The expansion of Erysiphe colonies over an initial 12-day period was favoured by incubation at 15°C compared with 10 or 20°C. In the first 8 to 10 days of growth, secondary and tertiary hyphae formed most rapidly at 20°C. After 12 days, expansion of colonies at 20°C was limited to the area initially infested by primary hyphae, whereas in colonies grown at 10 and 15°C secondary and tertiary hyphae had extended beyond the area first colonized. Small colonies of densely packed hyphae formed at 20°C compared with open spreading colonies observed at 10 and 15°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.1998.00252.x
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  • 7
    Electronic Resource
    Electronic Resource
    Field Srudies of Powdery Mildew (Erysiphe crucifearum on Brussels Sprouts (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 23 (1974), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In Brussels sprouts, Erysiphe critciferarum was found to penetrate deeply into the bads as well as infect the leaves and stems. Differences in the susceptibility of cultivars was evident in the field, and resistant cultivars included Bintree, Fasko 48, Frigostar, Groeningse Late, Leda, Solid Line and Triumph. Some cultivars had high levels of infection on the buds and low levels on the leaves, and other cultivars vice versa. Passage of infected buds through a mechanical stripper did not remove all infected bud-leaves, and with highly susceptible cultivars it would be necessary to hand trim the buds also. In cold weather powdery mildew caused additional blemishing of the sprout buds since the areas around mycelial colonies turned black. A key for assessing the percentage leaf area infected is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1974.tb02917.x
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  • 8
    Electronic Resource
    Electronic Resource
    The susceptibility of Brassica oleracea cultivars to Plasmodiophora brassicae (clubroot) (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 35 (1986), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: An evaluation of 404 Brassica oleracea cultivars for susceptibility to Plasmodiophora brassicae (clubroot) at one field site in northern Scotland over the four years 1979-82 is reported. The population of P. brassicae at this site possessed a high degree of virulence to B. oleracea as determined by seedling tests in a glasshouse environment, using the European Clubroot Differential series. No statistically significant differences in susceptibility were consistently identified between cultivars when tested under field conditions. Data over years and over crops were analysed by the residual maximum likelihood technique. Differences between cultivars were small compared with cultivar x year interactions. No obvious differences were identified in susceptibility between the crop types Brussels sprout, cabbage, calabrese and cauliflower. Disease levels as analysed over all field trials increased markedly in years three and four of this experiment compared with the first two years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1986.tb01987.x
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  • 9
    Electronic Resource
    Electronic Resource
    The repression and stimulation of growth of Erysiphe sp. on Rhododendron by fungicidal compounds (1997)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 46 (1997), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Erysiphe sp. is a causal agent of powdery mildew on Rhododendron. A novel in vivo method permitting the screening of fungicides on woody plants is described. Eight fungicides were evaluated for activity against Erysiphe sp. using Rhododendron ponticum microplantlets grown in vitro. Pathogen development changed with both the type of fungicidal compound and the concentrations applied. The most active materials were fenpropidin and penconazole, which showed high activity at the lowest concentrations. Six of the compounds performed more effectively than a mixture of bupirimate + triforine (Nimrod T), the standard recommendation for control of this pathogen on Rhododendron. All fungicides affected the sporulation of Erysiphe sp., with propiconazole, pyrazophos and triadimenol causing a significant increase in sporulation at the lowest concentrations. At higher concentrations, sporulation was significantly reduced by all treatments. No phytotoxic effects were detected with any fungicide at any concentration. The growth of plantlets in most treatments showed no significant difference from the untreated controls. The results of the study are discussed in relation to strategies for control and the epidemiology of Erysiphe sp. infecting Rhododendron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.1997.d01-25.x
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of relative humidity, light intensity and photoperiod on the colony development of Erysiphe sp. on Rhododendron (2002)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 51 (2002), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Growth and reproduction by powdery mildew pathogens is generally inhibited by decreasing relative humidity. With Erysiphe sp. on Rhododendron cv. Elizabeth, the initial stages of colony development were adversely affected by reducing the relative humidity from 100% to 70 and 85%. No significant effects on secondary or tertiary hyphal development were detected. Light intensity and photoperiod both had considerable effect on the induced resistance response of the host. Over the initial 5 days of colonization there were no significant differences between any of the treatments. After 13 days, however, expansion of fungal colonies at 180 photosynthetic active radiation (PAR) was limited solely to the area initially infested by primary hyphae. By comparison, in colonies grown at 80 PAR regardless of day length, secondary and tertiary hyphae had extended beyond the area first colonized. These effects resulted in differing morphologies, small colonies of densely packed hyphae formed at 180 PAR compared with open spreading colonies at 80 PAR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0032-0862.2001.x
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