Alternative Strategies for Broadleaf Weed Management in Residential Lawns

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Siva, Cynthia
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University of Guelph

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.

turfgrass weed control, broadleaf weed control, weed management, residential lawn, turfgrass lawn, home lawn, Ontario cosmetic pesicide ban, pesticides act, alternative weed control, alternative weed management, dandelion, Taraxacum officinale, weed control, weed management, turfgrass, turfgrass renovation, turfgrass establishment, lawn renovation, lawn establishment, sod, Kentucky bluegrass, acetic acid, lactic acid, citric acid, flame-weeding, flaming, corn gluten meal, Sclerotinia minor, biological control, biological weed management, pesticide, herbicide, bioherbicide, biopesticide, biocontrol, low risk pesticide, low risk herbicide, alternative herbicide, alternative pesticide, chelated iron, controlled environment, growth chamber, leaf wetness duration, temperature, fungal plant pathogen, disease, plant pathogen