April 17, 2007
 
University of Arkansas, Turfgrass Science Program

1. Golf and Sports Turf Classic next Monday (April 23, 2007)
2. Weed identification
3. Spring dead spot of bermudagrass
4. Controlling bermudagrass with glyphosate and fluazifop

Calendar of events
Golf and Sports Turf Classic, April 23, 2007, Fayetteville, AR
            - more details at http://hort.uark.edu/golf/golf-tournament.html
Turfgrass Field Day, Wednesday August 1, 2007, Fayetteville, AR (more details to come)

Homeowner lawn care tips
Weed control -
Good cultural practices account for 60 to 70 percent of turfgrass weed control. Maintaining a dense, vigorous lawn is essential to prevent lawn weeds. However, a supplemental herbicide application may occasionally be needed to control weeds. The first step in good weed control with a herbicide is to correctly identify the weed. Weeds that are commonly visible right now include, henbit, common chickweed, dandelion, and shepard’s purse. For more information on their identification please visit: http://www.aragriculture.org/horticulture/ornamentals/weed_id/default.htm

For more information about weed control in home lawns please check out the linked publication: http://turf.uark.edu/publications/factsheets/FSA-2109.pdf

Information for professionals on weed control is available at:
http://turf.uark.edu/publications/factsheets/MP370.pdf

Spring dead spot
Spring dead spot is generally considered to be the most significant disease of bermudagrass. Spring dead spot disease can show up each year on bermudagrass home lawns, however, it tends to be more prevalent on intensively managed bermudagrass. Low cutting height, soil compaction, high pH, overferilization, and thatch accumulation may contribute to the onset of the disease. This disease becomes evident at spring green-up time during March or April in Arkansas.  Read more about spring dead spot in this new fact sheet available at:
http://turf.uark.edu/publications/factsheets/FSA-7551.pdf

Research update
Controlling bermudagrass with glyphosate and fluazifop -
During bermudagrass golf course or athletic field renovations, complete removal of existing bermudagrass is imperative for establishing a pure, contaminant-free stand of a new bermudagrass cultivar. Research in Arkansas by John Boyd found that bermudagrass could be controlled with one less application when fluazifop-p-butyl (Fusilade II 24 oz/acre) was tank mixed with glyphosate (Roundup 2 qts/acre) rather than applying glyphosate alone. This research was recently confirmed by researchers in Tennessee and Florida. Their results suggest turfgrass managers considering bermudagrass renovation should use three applications of glyphosate + fluazifop-p-butyl with repeat applications scheduled 4 weeks apart to obtain complete control of the existing bermudagrass. Their research also found that tank-mixing 1 pound of ammonium sulfate with glyphosate helped increase initial bermudagrass control, but did not have any long-term control benefit.
View the complete results at http://www.plantmanagementnetwork.org/pub/ats/research/2005/hybrid/

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