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This article in SSSAJ

  1. Vol. 20 No. 1, p. 107-110
     
    Received: Oct 18, 1954
    Published: Jan, 1956


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doi:10.2136/sssaj1956.03615995002000010027x

Effect of Biocides on the Development of Ectotrophic Mycorrhizae in Monterey Pine Seedlings1

  1. S. A. Wilde and
  2. D. J. Persidsky2

Abstract

Abstract

Sandy nursery soil of siliceous outwash, autochthonously inoculated with mycorrhizal fungi, was treated with chlordane, benzene hexachloride, thiosan, calomel, formaldehyde, aluminum sulfate, allyl alcohol, and Stoddard solvent at the rates common in nursery practice. After incubation, the cultures were planted to surface-sterilized seed of Pinus radiata, and the external and internal development of mycorrhizal short roots was recorded at definite intervals. The internal alterations of mycorrhizae under the influence of eradicants were characterized by irregularities in the shape of the fungal mantle, restricted penetration of mycelia, and reduced development of the Hartig net. The external modifications of the short roots suggested that biocides cause radical changes in the exudates of rhizospheric organisms. The effect of eradicants varied with the nature of chemical compounds and their rate of application, but some of the observed modifications of mycotrophic organs were symptomatic of the eradicants applied.

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