Abstract
AbstractPerennial broadleaves such as dandelion (Taraxacum officinale G.H. Weber ex Wiggers) and white clover (Trifolium repens L.) are known to be pervasive weeds in stands of maintained turfgrasses. The use of synthetic herbicides is the most common and effective method of control for these weeds. As pesticide use in European countries, Canada, and the United States is becoming more scrutinized, identification of alternative weed control options may be necessary. However, few organic or natural weed control products exist. A field study was conducted to evaluate the efficacy of various fertilizers and organic and bio‐herbicides including chelated iron, ammonium nanonate, citrus oil, acetic acid, and sodium chloride on dandelion and white clover control as compared to that of two synthetic herbicides containing 2,4‐dichlorophenoxy‐acetic acid (2,4‐D), mecoprop‐p (MCPP), and dicamba. Injury to perennial ryegrass (Lolium perenne L.) was also evaluated with the objective of determining which products effectively suppressed weed populations while imposing minimal injury to desirable turfgrasses. Chelated iron was effective in controlling dandelion and white clover populations equal to that of both synthetic herbicides with minimal injury to turfgrass. Other organic and bio‐herbicide treatments provided some control of both weed populations but generally were too injurious to the turfgrass. Fertility treatments and citrus oil did not reduce populations of either weed. This research indicates that some natural products currently on the market may serve as effective alternatives to synthetic herbicides. This information will be beneficial to homeowners and turfgrass managers controlling weed populations in geographic areas with restricted pesticide use or where control with organic products is desired.
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