Microbial weed control of broadleaf weeds in turfgrass

Karen L. Bailey, Joanne Derby, Wayne Pitt, Stuart Falk, Bruce Augustin

    Research output: Book chapter/Published conference paperConference paperpeer-review


    A good, healthy stand of turfgrass is pleasing to the eye, but also provides numerous otherbenefits to people and the environment. The occurrence of broadleaf weeds disrupts theuniformity and vigour of turfgrass by competing for light, nutrients, moisture, and physical space.Integrated weed management advocates pest prevention, using reduced risk products, andapplying pesticides only when necessary. Biological weed control uses living organisms or theirnaturally-occurring products to kill or suppress weeds and is an alternative practice emerging as areduced risk technology. The fungus, Phoma macrostoma, was discovered on diseased Canadathistle (Cirsium arvense L.) plants growing across Canada. When applied to the soil surfacebefore weed emergence, the fungus causes the plants to come up white and eventually die. It alsosignificantly reduces the foliar biomass of established weeds. Host range testing showed thatvarious broadleaf weeds such as Canada thistle, dandelion (Taraxacum officinale Weber ex F.H.Wigg.), scentless chamomile (Matricaria perforata Mérat), chickweed (Stellaria media (L.)Vill.), and white clover (Trifolium repens L.) were damaged by the fungus, but wild oat (Avenafatua L.) and green foxtail (Setaria viridis (L.) Beauv.) were not harmed. Crop testing showedthat barley, wheat, oat, millet, canary seed, and various cultivars of grass were not affected, butbroadleaf crops had varying degrees of susceptibility. Field testing is being conducted at severalsites across Canada and the USA. The trials will determine application parameters and otherconditions for use. Environmental fate studies on the dispersion and survival of the fungus in soiland plant tissues have shown little dispersion from the area of placement and a low risk ofsurvival after one year.
    Original languageEnglish
    Title of host publication58th Annual Meeting of the Canadian Weed Science Society
    Publication statusPublished - 2004
    Event58th Annual Meeting of the Canadian Weed Science Society - Winnipeg, Manitoba, Canada, Canada
    Duration: 28 Nov 200401 Dec 2004


    Conference58th Annual Meeting of the Canadian Weed Science Society


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