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Effect of Paclobutrazol and Flurprimidol on Suppression of Poa annua spp. reptans in Creeping Bentgrass (Agrostis stolonifera) Greens

Published online by Cambridge University Press:  12 June 2017

B. Jack Johnson  and
Tim R. Murphy
B. Jack Johnson
Affiliation:
Crop and Soil Sci., Univ. Georgia, Georgia Agric. Exp. Stn., Griffin, GA 30223-1797
Tim R. Murphy
Affiliation:
Crop and Soil Sci., Univ. Georgia, Georgia Agric. Exp. Stn., Griffin, GA 30223-1797
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Abstract

Plant growth regulators paclobutrazol and flurprimidol were evaluated for suppression of Poa annua spp. reptans, a perennial biotype of annual bluegrass, in a creeping bentgrass green. Paclobutrazol at 0.6 kg ai/ha applied on Mar. 15, followed by 0.3 kg/ha on Apr. 29, 0.6 kg/ha on Oct. 1, and 0.3 kg/ha on Nov. 12 for each of 2 yr suppressed P. annua spp. reptans 28% approximately 4 mo after the final treatment. When paclobutrazol was applied at 0.3 kg/ha in each of four applications during the same period, suppression was similar to that with the higher rate 1 and 2 mo after final treatment but declined to 7% by 4 mo. Suppression of P. annua spp. reptans from flurprimidol applied four times during each of 2 yr was 22 to 27% 1 mo after final treatment but no suppression was noted 2 mo after the final treatment. Maximum creeping bentgrass injury was less than 20% when either paclobutrazol or flurprimidol was applied in the spring. However, creeping bentgrass injury was approximately 30% in the fall when either chemical was applied in the spring and repeated in October at 0.6 kg/ha.

Keywords

Flurprimidol, α-(1-methylethyl)-α-[4-(trifluoromethoxy)phenyl]-5-pyrimidine-methanolpaclobutrazol, (±)-(R∗R∗) β-[(4-chlorophenyl)-methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanolannual bluegrass, Poa annua ssp. reptans (Hausskn.) Timm. # POAANcreeping bentgrass, Agrostis stolonifera L. ‘Penncross.’Golf greenplant growth regulatorsturfgrass injuryweed control
Type
Research
Information
Weed Technology , Volume 9 , Issue 1 , March 1995 , pp. 182 - 186
Copyright
Copyright © 1995 by the Weed Science Society of America 

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