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  • 1
    ISSN: 1432-0789
    Keywords: Key words Soil solarization ; Damping-off ; Soil infectivity ; Forest nursery ; Biological control ; Pythium ; Fusarium ; Rhizoctonia solani
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Field experiments were carried out at two different forest nurseries during the summer of 1994 to examine the efficacy of soil solarization for the control of damping-off. Both soils hosted Pythium spp., Fusarium spp. and Rhizoctonia solani as damping-off agents. Soil samples from solarized, steamed, fumigated and untreated plots were periodically collected and assayed for soil infectivity. Solarization with a double layer of polyethylene film was as effective as steaming or fumigation in reducing soil infectivity in the uppermost layer. During July the temperature of covered beds rose as high as 50°C at a soil depth of 5cm. The method achieved good control of Pythium spp., the main cause of damping-off at both nurseries, whereas Fusarium spp. were more tolerant. The association of Trichoderma spp. with a reduction of soil infectivity at the last sampling date strongly suggested that biocontrol processes were induced after solarization. Soil solarization provides a suitable method for control of damping-off.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 124 (1990), S. 1-6 
    ISSN: 1573-5036
    Keywords: Glomus intraradices ; propagule ; soil receptiveness ; VAM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The concept of soil receptiveness widely used for soil borne pathogens, is applied to the fungi forming vesicular-arbuscular endomycorrhizae. The authors propose a method for determining the mycorrhizal soil receptiveness (MSR) using leek, a highly mycotrophic plant, as a host for a bioassay. Under controlled conditions, populations of leek plants are grown in a soil inoculated with a range of inoculum levels. The inoculum consists of standardized root pieces infected with G. intraradices which are considered as propagules. The relationship between the percentage of plants forming mycorrhizae and the level of inoculum is used as a basis for determining the quantity of inoculum required to obtain mycorrhizae formation on 50% of the host plant population. The results are defined in terms of MSR unit, and are expressed as number of propagules corresponding to a MSR50 unit, or as MSR50 unit per propagule. This method is illustrated in a comparative study of four agricultural soils from France.
    Type of Medium: Electronic Resource
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