Now showing items 1-14 of 14

  • Alfalfa Downy Mildew 

    Johnson, Dennis A. (Dennis Allen); Peaden, Richard N.; Ford, William P. (Pullman, Washington : Washington State University. Extension., 1989-09)
    Downy mildew on alfalfa is caused by the fungus Peronospora trifoliorum. The disease can be severe in spring and fall when cool, wet conditions are present. Discusses symptoms, disease cycle, and control. 2 pages.
  • Concepts of integrated pest management in Washington 

    Mayer, D. F.; Johnson, Dennis A. (Dennis Allen); Johansen, C. A. (Carl A.) (Pullman, Washington : Washington State University. Extension., 1980-12)
  • Concepts of integrated pest management in Washington 

    Mayer, D. F.; Johnson, Dennis A. (Dennis Allen); Johansen, C. A. (Carl A.); Retan, Arthur H. (Pullman, Washington : Washington State University. Extension., 1995-04)
  • Concepts of integrated pest management in Washington 

    Mayer, D. F.; Johnson, Dennis A. (Dennis Allen); Johansen, C. A. (Carl A.); Retan, Arthur H. (Pullman, Washington : Washington State University. Extension., 1991-03)
  • Controlling Late Blight in Commercial Potato Fields 

    Inglis, Debbie, 1953-; Johnson, Dennis A. (Dennis Allen); Byther, Ralph S. (Pullman, Washington : Washington State University. Extension., 1996-04)
    Explains how Phytophthora infestans, a fungus, infects potato plants, reducing yields and ruining harvests. Discusses sanitation and cultural practices, host tolerance, fungicide resistance, and disease forecasts. 8 pages.
  • Crown gall of grapes 

    Johnson, Dennis A. (Dennis Allen); Ahmedullah, M. (Pullman, Washington : Washington State University. Extension., 1982-08)
  • Cytospora Canker of Stone Fruits 

    Grove, Gary G.; Regner, Kurt M.; Johnson, Dennis A. (Dennis Allen) (Pullman, Washington : Washington State University. Extension., 1987-08)
    Predominately found in stone fruits such as peach, nectarine, prune, plum, and sweet cherry, the Cytospora canker is also known as peach canker, perennial canker, and Valsa canker. Color photographs enhance the discussion ...
  • Eutypa dieback of grapevine in Washington 

    Johnson, Dennis A. (Dennis Allen); Ahmedullah, M. (Pullman, Washington : Washington State University. Extension., 1983-01)
  • Irrigation and disease management in dry bean production 

    Burke, Douglas Winston, 1920-; Miller, D. E.; Johnson, Dennis A. (Dennis Allen); Thompson, Gene Thomas, 1928- (Pullman, Washington : Washington State University. Extension., 1981-02)
  • Plant diseases: crown gall 

    Maloy, Otis C.; Davison, Arlen D. (Arlen Durant); Johnson, Dennis A. (Dennis Allen) (Pullman, Washington : Washington State University. Extension., 2000-05)
  • Plant diseases: Late blight of potato and tomato and its control in the home garden 

    Inglis, Debbie, 1953-; Johnson, Dennis A. (Dennis Allen); Byther, Ralph S. (Pullman, Washington : Washington State University. Extension., 1996-04)
    This disease is caused by Phytophthora infestans, a fungus common on potato and tomato in wet years. Plants, fruit, and tubers can be destroyed by it. Cultural controls are recommended as well as fungicide applications. 4 pages.
  • Sclerotinia Stem Rot on Potato 

    Johnson, Dennis A. (Dennis Allen) (Pullman, Washington : Washington State University. Extension., 1994-07)
    Also called white mold, sclerotinia stem rot is caused by a rapidly spreading fungus that becomes a problem under moist conditions in the Pacific Northwest. Center pivot irrigation can add to the problem. Good cultural ...
  • Verticillium Wilt 

    Sunseri, Matthew; Johnson, Dennis A. (Dennis Allen) (Pullman, Washington : Washington State University. Extension., 2001-12)
    Bulletin includes symptoms, pathogens, disease control. 4 pages.
  • Why cherry trees die 

    Blodgett, Earle C. (Earle Comstock), 1906-1991; Johnson, Dennis A. (Dennis Allen); Grove, Gary G.; Beers, Elizabeth H. (Elizabeth Hull), 1955- (Pullman, Washington : Washington State University. Extension., 1990-05)