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Effectiveness of Bensulide in Controlling Two Annual Bluegrass (Poa annua) Subspecies

Published online by Cambridge University Press:  12 June 2017

Lloyd M. Callahan  and
Ellen R. McDonald
Lloyd M. Callahan
Affiliation:
Univ. of Tenn., Knoxville, TN 37901-1071
Ellen R. McDonald
Affiliation:
Univ. of Tenn., Knoxville, TN 37901-1071
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Abstract

Studies were conducted to determine the effectiveness of 11 multiple treatment combinations of bensulide in controlling a perennial and an annual subspecies of annual bluegrass. Bensulide controlled 97% of the annual subspecies with annual applications of 11 kg ai ha–1 (Jan.) + 6 kg ha–1 (Feb.) + 6 kg ha–1 (Mar.) totaling 92 kg ha–1 in 4 yr. The annual subspecies appeared to have a germination period from mid November to early January. None of the bensulide treatments controlled the perennial subspecies acceptably. The common occurrence of these two subspecies in mixed stands may account for the erratic weed control reported by many researchers. Bentgrass showed good tolerance to bensulide totals over 4 yr of 160 kg ha–1 applied in a U.S. Golf Association rootzone green.

Keywords

Bensulide, 0,0-bis(1-methylethyl) S-[2-[(phenylsulfonyl)amino]ethyl]phosphorodithioatebentgrass, Agrostis palustris Huds. ‘Penncross’annual bluegrass, Poa annua ssp. annua (L.) Timm. ♯ POAAN and Poa annua ssp. reptans (Hausskn.) Timm. ♯ POAANGolf greenrootzonemorphological descriptionDNA analysischromosome number
Type
Research
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 97 - 103
Copyright
Copyright © 1990 by the Weed Science Society of America 

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