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  • 1
    Electronic Resource
    Electronic Resource
    Infection of onion leaves by Alternaria porri and Stemphylium vesicarium and disease development in controlled environments (2000)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 49 (2000), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Infection of onion by Alternaria porri and Stemphylium vesicarium was investigated under a range of controlled temperatures (4–25°C) and leaf wetness periods (0–24 h). Conidia of A. porri and S. vesicarium germinated within 2 h when incubated at 4°C. Terminal and intercalary appressoria were produced at similar frequencies at or above 10°C. The maximum number of appressoria was produced after 24 h at 25°C. Penetration of leaves by both pathogens was via the epidermis and stomata, but the frequency of stomatal penetration exceeded that of epidermal penetration. There was a strong correlation (R2 〉 90%) between appressorium formation and total penetrations at all temperatures. Infection of onion leaves occurred after 16 h of leaf wetness at 15°C and 8 h of leaf wetness at 10–25°C, and infection increased with increasing leaf wetness duration to 24 h at all temperatures. Interruption of a single or double leaf wetness period by a dry period of 4–24 h had little effect on lesion numbers. Conidia of A. porri and S. vesicarium separately or in mixtures caused similar numbers of lesions. Alternaria porri and S. vesicarium are both potentially important pathogens in winter-grown Allium crops and purple leaf blotch symptoms were considered to be a complex caused by both pathogens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2000.00458.x
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  • 2
    Electronic Resource
    Electronic Resource
    Survival of the lettuce anthracnose fungus (Microdochium panattonianum) in Victoria (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 37 (1988), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1365-3059.1988.tb02195.x
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  • 3
    Electronic Resource
    Electronic Resource
    Dispersal of Synchytrium psophocarpi in Papua New Guinea (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 32 (1983), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Airborne sporangia of Synchytrium psophocarpi showed a diurnal periodicity, maximum numbers occurring between 1600 and 1800 h and minimum numbers between 0600 and 0700 h. There wers significant correlations between the amounts of airborne sporangia and temperature (positive), relative humidity (negative) and dew (negative). The numbers of airborne sporangia increased following the onset of the wet season (November—April) but declined after the onset, of the dry season (May—October). Most airborne sporangia appeared to deposit within 15 m of their source. The potential for dispersal of sporangia by rain splash was demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1983.tb02830.x
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  • 4
    Electronic Resource
    Electronic Resource
    Resistance of lettuce and related species to anthracnose (Microdochium panattonianum) in Australia (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 37 (1988), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1365-3059.1988.tb02086.x
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  • 5
    Electronic Resource
    Electronic Resource
    Conidial dispersal by Alternaria brassicicola on Chinese cabbage (Brassica pekinensis) in the field and under simulated conditions (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 52 (2003), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: This study investigated conidial dispersal in the field, and effects of simulated wind and rain on the dispersal of A. brassicicola on Chinese cabbage (Brassica pekinensis). Spores were sampled using a Burkard volumetric spore sampler and rotorod samplers in a Chinese cabbage crop. Disease incidence in the field was well fitted by a Gompertz curve with an adjusted r2 of 〉0·99. Conidia of A. brassicicola were trapped in the field throughout the growing season. Peaks of high spore concentrations were usually associated with dry days, shortly after rain, high temperature or high wind speed. Diurnal periodicity of spore dispersal showed a peak of conidia trapped around 10·00 h. The number of conidia trapped at a height of 25 cm above ground level was greater than that at 50, 75 and 100 cm. Conidial dispersal was also studied under simulated conditions in a wind tunnel and a rain simulator. Generalized linear models were used to model these data. The number of conidia caught increased significantly at higher wind speeds and at higher rain intensities. Under simulated wind conditions, the number of conidia dispersed from source plants with wet leaves was only 22% of that for plants with dry leaves. Linear relationships were found between the number of conidia caught and the degree of infection of trap plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2003.00880.x
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  • 6
    Electronic Resource
    Electronic Resource
    Fungal club-heads in Papua New Guinea (1978)
    [s.l.] : Nature Publishing Group
    Nature 273 (1978), S. 374-375 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The club-heads are obtained from within the large mounds which birds of the family Megapodiidae construct in the local forests to incubate their eggs. The fungal material (called utiyani) is dried and then carved into either a smoothly rounded (Fig. 1) or a toothed disk always with a central hole ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/273374a0
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  • 7
    Electronic Resource
    Electronic Resource
    Biomass and flower production of winged bean in a nutrient film (NFT) hydroponic system (1989)
    Springer
    Plant and soil 113 (1989), S. 85-92 
    Details
    ISSN: 1573-5036
    Keywords: biomass ; hydroponics ; NFT ; winged bean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Winged bean (Psophocarpus tetragonolobus (L) DC) accessions showed exponential growth 10 days after planting (DAP) in a NFT hydroponic system. Flowering increased exponentially following the onset of short daylength but 86–94% of flowers abscissed. Leaves accounted for 26–34%, stems 49–52%, and roots 15–17% of total biomass. Ion concentration in the nutrient solution declined within 5 days of replenishment. Roots accumulated higher concentrations of Ca, K, P, Fe, and Mn than aerial parts of the plant; levels of P and Fe in leaves were similar to soil grown plants whilst hydroponically grown plants had higher levels of Ca in leaves, K in green pods, P in tubers, and Fe in flowers. Plants with a dwarf habit (GRWB-11) reverted to indeterminate growth in NFT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181925
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  • 8
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    Biomass and flower production of winged bean in a nutrient film (NFT) hydroponic system (1989)
    Springer
    Details
    Publication Date: 1989-01-01
    Print ISSN: 0032-079X
    Electronic ISSN: 1573-5036
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 9
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    Fungal club-heads in Papua New Guinea (1978)
    Springer Nature
    Details
    Publication Date: 1978-06-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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