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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 37 (1988), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Soils from anthracnose-infected lettuce fields at Keilor, Werribee South and La Trobe University caused lesions of Microdochium panattonianum to develop when inoculated on to lettuce leaves. Under field conditions conidia lost infectivity within 10 weeks in pasteurized and 6 weeks in non-pasteurized Werribee South soil, 2 weeks in Keilor red and immediately in Keilor black non-pasteurized soils. Soils remained infective for 18 weeks in non-pasteurized and pasteurized Werribee South soils inoculated with conidia and for Hand 16 weeks respectively when the same soils were inoculated with infected leaf discs.In 1983 and 1984 M. panattonianum survived for 14 and 16 weeks respectively on infected Cos Verdi debris on the soil surface, for 10 and 20 weeks respectively on debris buried at 10 cm depth and for 70 and 58 weeks respectively on debris suspended in the air. The fungus survived for similar periods on infected Winterlake debris on the soil surface and buried at 10 cm depth. In soil the decline of infectivity was primarily influenced by duration of exposure and soil moisture, and in debris by duration of exposure and rainfall that occurred over the 2 weeks preceding each sample. The disease was not transmitted on seed produced on infected plants. Seedlings grown from healthy seed inoculated with conidia did not develop anthracnose after the seed had been stored for 24 days at 5 or 20°C. The significance of these results to the management of lettuce anthracnose in Victoria is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 37 (1988), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: All 35 commercial lettuce cultivars available in Australia, two cultivars of chicory, one cultivar of endive and single accessions of Lactuca saligna, L. serriola and Sonchus oleraceus were tested for susceptibility to Microdochium panattonianum under glasshouse and field conditions. Under controlled environmental conditions log lesion density on cv. Cos Verdi was linearly related to log inoculum concentration. Inocula from L. saliva and L. serriola were cross-infective but did not infect the single accessions of L. saligna and S. oleraceus tested. All lettuce cultivars were susceptible. Some cultivars showed a relatively greater increase in susceptibility than others at an increased inoculum concentration. Latent periods for different cultivars ranged from 3 to 7 days under glasshouse conditions and from 8 to more than 17 days in a field trial. There was poor correlation between glasshouse and field trials for the disease rating of cultivars. Chicory, endive and the L. saligna accession were immune (symptomless) and the L. serriola accession was highly resistant. The results indicate that L. saligna, L. serriola. endive and chicory are possible sources of genes for resistance to M. panattonianum.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 52 (2003), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Undiluted culture filtrates of two commercial products of Trichoderma spp., Trichopel and Trichoflow, and two isolates of Penicillium citrinum completely inhibited the conidial germination of macroconidia of Claviceps africana, the cause of ergot or sugary disease of sorghum (Sorghum bicolor) in vitro. Similarly, Pseudomonas aeruginosa and Burkholderia cepacia completely inhibited macroconidial germination, with the former being more effective at high dilutions. In contrast, these bacterial isolates failed to inhibit infection in vivo in glasshouse tests with ergot-inoculated sorghum, but all fungal biocontrol agents (including an isolate of Epicoccum nigrum) reduced the severity of disease (percentage of infected spikelets per panicle), in some cases completely inhibiting the development of ergot. In a second glasshouse trial, optimum control was achieved when the biocontrol agents were applied 3–7 days before inoculation with conidia of C. africana.
    Type of Medium: Electronic Resource
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