Weed management treatments were examined as alternatives to conventional chemical herbicides. Site preparation and post-establishment treatments were tested in a randomized complete block factorial design, over two years. There were no site preparation treatment effects of untreated control, glyphosate, acetic acid, and flame weeding. Of the post-establishment treatments, lactic/citric acid and corn gluten meal were ineffective. Sclerotinia minor provided minimal results. Chelated iron, mecoprop/2,4-D/dicamba, and sod reduced the weed cover to < 5%. The efficacy of S. minor on Taraxacum officinale was evaluated three controlled environment studies. Treatments included five temperatures: 12, 16, 20, 24, and 28C and thirteen leaf wetness durations (LWD): 0 to 96 hrs, in 8-hr increments. The main effects (temperature and LWD) and interaction were significant with respect to disease severity over time. A LWD of 48 hrs at 20C and 72 to 96 hrs at 12 and 16oC was required for high disease severity., Funding was provided by the Ontario Ministry of Environment through the Ontario Pesticide Advisory Committee, and Agriculture and Agri-Food Canada through the Clusters Initiative of the Growing Canadian Agri-Innovations Program administered by Vineland Research and Innovations Centre Inc. Also, by Ontario Ministry of Agriculture Food and Rural Affairs through the OMAFRA-University of Guelph Research Agreement.