Full TGIF Record # 33772
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Prinster, M. G.
Author Affiliation:TruGreen-ChemLawn, Douglasville, GA 30134
Title:Efficacy and safety of spring-applied preemergence herbicides on crabgrass and immature tall fescue
Meeting Info.:Dallas, TX: January 17-19, 1994
Source:Southern Weed Science Society Proceedings. Vol. 47, 1994, p. 255.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:1
Keywords:TIC Keywords: Festuca arundinacea; Herbicide resistance; Dithiopyr; Pendimethalin; Prodiamine; Benfluralin; Oryzalin; Weed control; Herbicide application; Transition zone
Cultivar Names:Rebel II/Tribute
Abstract/Contents:"Fall overseeding of tall fescue (Festuca arundinacea Screb.) is a common practice in the Transition Zone where summer heat, drought and disease can cause significant stand loss. Preemergence herbicide applications made the following spring have been shown to cause injury to immature tall fescue. This series of experiments was conducted to evaluate various preemergence herbicides applied over several timings for safety to immature tall fescue and control of crabgrass (Digitaria spp.). Herbicides were applied in 1991 and 1992 to Rebel II/Tribute tall fescue seeded early in November the previous year. This delayed seeding time ensured an immature stand for the spring applications. Three experiments were initiated at monthly intervals with most treatments split into two applications eight weeks apart. (February 1 + April 1, March 1 + May 1, April 1 + June 1). Treatments included a single application of dithiopyr 1 EC 0.5 lb. ai/A and split applications of dithiopyr at 0.125 + 0.375 lb. ai/A and 0.25 + 0.25 lb. ai/A. Pendimethalin was applied 1.5 + 1.5 lb. ai/A as a liquid from the 60 DG formulation and as a dry formulation on a 13-3-7 fertilizer with 0.86% active ingredient. Prodiamine 65 WG was applied at 0.5 + 0.5 lb. ai/A and benefin 60 DF 2.5 lb. ai/A was followed by oryzalin 4 AS 1.5 lb. ai/A. Of the three timings evaluated, the earliest herbicide applications (February + April) consistently caused the greatest turf injury due to the immaturity of the seedlings. The March + April and April + June timings caused less phytotoxicity. In both years dithiopyr 0.5 lb. ai/A caused the greatest injury to immature tall fescue 1 to 2 MAT. Split treatments of dithiopyr, especially 0.125 + 0.375 lb. ai/A, had a much greater margin of safety. Pendimethalin 60 DG 1.5 + 1.5 lb. ai/A also caused unacceptable injury, however the dry formulation was very safe suggesting seedling intolerance to foliar absorbtion of this herbicide. Prodiamine and benefin + oryzalin had excellent turf safety at all application timings. Prodiamine 0.5 + 0.5 lb. ai/A provided the greatest and most consistent crabgrass control in 1991 and 1992, regardless of application timing. Both pendimethalin sources gave consistent crabgrass control as well, however, the dry granular formulation did provide better results through two years. Dithiopyr applied in sequential treatments provided acceptable crabgrass control whereas the single 0.5 lb. ai/A treatment was inconsistent and less effective. Benefin + oryzalin provided inadequate crabgrass control suppression at most timings through 1991 and 1992."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Prinster, M. G. 1994. Efficacy and safety of spring-applied preemergence herbicides on crabgrass and immature tall fescue. South. Weed Sci. Soc. Proc. 47:p. 255.
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