Weeds can be divided into categories based on life cycles. Always read the label prior to using turfgrass herbicides. The product label is the best reference for safe and effective use of any herbicide. Many herbicides cannot be used on every turfgrass species. Herbicides should be applied at specific times of the year and will control only certain weed species. Herbicides are important components of a lawn weed control program. At rates required for weed control, the herbicide must be proven safe to humans, the environment and turfgrasses. Before an herbicide is labeled for use in home lawns, it is thoroughly investigated by chemical companies, land-grant universities and various regulatory agencies. HerbicidesĪn herbicide is a chemical used to control weed growth and development. Hand-pulling a "strange" or "new" weed when it first appears in the lawn will help prevent the spread of that weed. Following mowing frequency and cutting height guidelines can limit development of many weed species however, it is time consuming and not effective for the control of most perennial weeds. Many weed species do not tolerate frequent mowing. The use of herbicides without following approved cultural practices will not result in a high quality, weed-free lawn. Properly maintained turfgrasses are more competitive with weeds than turfgrasses that do not receive good cultural practices. The impact of proper cultural practices on a lawn weed control program cannot be overemphasized. Visit for additional information on turfgrass maintenance practices.
Improper mowing procedures (cutting height is too low or too high, or the turfgrass is not mowed at correct time intervals).Improper watering (too much or too little).Improper fertilization (too much or too little, or wrong application date or N-P-K ratio).Weeds appear primarily in bare or thin areas of the turfgrass, which may be due in part to one or more of the following: Weeds do not easily invade turfgrasses that are properly fertilized and watered and that are mowed at the correct height and frequency. The first line of defense against weeds is to follow cultural practices that promote vigorous turfgrass growth and development. Weeds appear primarily in bare or thin areas of the turfgrass, which may be due in part to one or more of the following: Cultural Practices Many weeds can quickly become the dominant species in a lawn. Additionally, weeds compete with turfgrasses for sunlight, soil moisture, nutrients and space.
Due to differences in color, leaf size, shape and growth habit, weeds detract from the natural beauty of desirable turfgrasses. Murphy, Extension Agronomist - Weed Science Revised by Patrick McCullough and Clint Waltz, Extension Weed Scientist and Turfgrass Specialists
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