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Filtering by: Creator Utkhede, Raj S. Remove constraint Creator: Utkhede, Raj S. Advisor Linderman, Robert G. Remove constraint Advisor: Linderman, Robert G.

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  • Biology, epidemiology, and biological and chemical control of Phytophthora vignae

    Creator:
    Fernando, W. Gerard Dilantha
    Abstract:
    Phytophthora vignae, causal agent of stem and root rot of cowpea (Vigna unguiculata), was reported for the first time in Sri Lanka. The pathogen was found in cowpea field soils from 3 of 5 geographic regions sampled. Only one site however, had plants exhibiting disease symptoms. Of the eight cowpea...
    Resource Type:
    Dissertation
    Full Text:
    Pythium diseases were developed only in the late 1970's. Two systemic 4 fungicides, metalaxyl and

  • The biology and control of Phytophthora root and stem rot of apple rootstocks from stool beds

    Creator:
    Tidball, Carolyn Jean
    Abstract:
    The present studies were conducted to better understand the etiology, epidemiology and potential control of the Phytophthora stem root rot as it occurs in apple stool beds. Symptoms of Phytophthora root and stem rot occurred as early as May and continued to develop throughout the growing season. Sunken brown-black lesions...
    Resource Type:
    Masters Thesis
    Full Text:
    (McIntosh, 1975; Julis et al., 1978; Helton et al., 1984; Utkhede, 1986), and the site had trees visibly

  • Microbial changes and interactions in the rhizosphere of vesicular-arbuscular mycorrhizal plants

    Creator:
    Meyer, Julie (Julie Rae)
    Abstract:
    The influence of vesicular-arbuscular mycorrhizae (VAM) on populations of general taxonomic and functional groups of naturally-occurring rhizosphere bacteria and actinomycetes associated with roots of sweet corn (Zea mays var. rugosa) and subterranean clover (Trifolium subterraneum L.) was assayed using selective media. Sporangial production by Phytophthora cinnamomi was also used as...
    Resource Type:
    Masters Thesis
    Full Text:
    et al., 1975), Bacillus (Raj et al., 1981) and Aspergillus niger (Manjunath et al., 1981) have been

  • Mediation of conifer root growth by mycorrhizal fungi and plant growth regulators

    Creator:
    Scagel, Carolyn F.
    Abstract:
    Many mycorrhizosphere microorganisms can produce plant growth regulating compounds in vitro. Plant growth regulating compounds are known to mediate root growth and development. In reforestation practices, conifer tree seedling growth and survival are linked to rapid root growth and development after outplanting. Multifactorial experiments were conducted to document variations in...
    Resource Type:
    Dissertation
    Full Text:
    =IBA; S=Stimroot; A=Alginate; E=Ethrel and C=Control 233 FIGURE 4-3: Morphological responses of