Garden Talk

with Rebecca Jordi

Q:  Can I use 2,4-D to control weeds in my bahiagrass lawn?  

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A:   The best method of weed control is to maintain a healthy, vigorous turf. Following UF/IFAS recommendations for proper fertilization, irrigation, and mowing will help to maintain a healthy lawn that is able to outcompete most weeds. However, if weed problems persist, the following chemical treatments may be used on bahiagrass for weed control when needed. Post-emergence herbicides are applied to weeds presently growing, it does not control seeds. Post-emergence herbicides (e.g., 2,4-D, dicamba, and/or MCPP) should be applied in May as needed for control of annual and perennial broadleaf weeds, such as knotweed, spurge, and lespedeza. Selective control of emerged grass weeds, such as goosegrass, crabgrass, or alexandergrass, can only be achieved by hand pulling. Sedges can be controlled with applications of halosulfuron. Drop off samples of your weeds for positive identification before applying herbicides. This is important to avoid improper application which wastes money and time – it does not help the environment either.  Apply herbicides only when adequate soil moisture is present, air temperatures are between 60°F and 85°F, and the turf is not suffering from water or mowing stress. Failure to follow these precautions will result in damaged turf. For information on controlling weeds in the lawn, please refer to ENH884, Weed Management in Home Lawns, (http://edis.ifas.ufl.edu/ep141). Many popular “weed-n-feed” fertilizers for home lawns contain the herbicide atrazine or metsulfuron. Both of these herbicides will damage bahiagrass; therefore, we do not recommend using weed and feed products on bahiagrass.  For these reasons it is critical to read the herbicide label.  Remember – “the label is the law.” 

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