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This article in AJ

  1. Vol. 61 No. 5, p. 701-705
     
    Received: Feb 5, 1969


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doi:10.2134/agronj1969.00021962006100050015x

Influence of Nitrogen Fertilizers on Washington Creeping Bentgrass, Agrostis palustris Huds. II. Incidence of Dollar Spot, Sclerotinia homoeocarpa, Infection1

  1. F. E. Markland,
  2. E. C. Roberts and
  3. L. R. Frederick2

Abstract

Abstract

A field experhnent was established to evaluate influence of nitrogenous fertilizers on susceptibility of ‘Washington’ creeping bentgrass, Agrostis palustris Huds., to dollar spot disease, Sclerotinia homoeocarpa F. T. Bennett. The field study also supplied soil and plant tissue used in a series of laboratory experiments to investigate effects of activated sewage sludge and processed tankage on growth of S. homoeocarpa in pure culture. Influences of nitrogenous fertilizer on soil fungistasis and on plant tissue fungistasis were also investigated.

High levels of available nitrogen reduced dollar spot injury in field tests. Activated sewage sludge, which was most effective in producting disease resistant turf, did not possess any measurable fungitoxic agents. Soil microbiological activity, fertility, fungistasis and pH were not altered significantly by fertilizer treatment.

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