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Response of Downy Brome (Bromus tectorum) and Kentucky Bluegrass (Poa pratensis) to Applications of Primisulfuron

Published online by Cambridge University Press:  12 June 2017

Paul E. Hendrickson  and
Carol A. Mallory-Smith
Paul E. Hendrickson*
Affiliation:
Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331-3002
Carol A. Mallory-Smith
Affiliation:
Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331-3002
*
Corresponding author's E-mail: paul.hendrickson@orst.edu.
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Abstract

Greenhouse and growth chamber experiments were conducted to evaluate primisulfuron phytotoxicity to downy brome (Bromus tectorum) and Kentucky bluegrass (Poa pratensis) as a function of herbicide placement, adjuvants, and environmental conditions. Primisulfuron rates needed to produce GR50 (50% growth reduction) values were 0.97 ± 0.57 and 8.07 ± 1.85 g/ha for downy brome and Kentucky bluegrass, respectively. Primisulfuron was applied to downy brome and Kentucky bluegrass at three placement sites: foliar, soil, and foliar plus soil. Foliar or foliar plus soil applications were more effective at reducing downy brome dry weights than the soil application of primisulfuron, whereas Kentucky bluegrass was injured more from the soil or foliar plus soil applications than from the foliar application of primisulfuron. Primisulfuron at 5 g/ha applied alone reduced downy brome dry weights by 5%, whereas when an adjuvant was added, dry weights were reduced by 52 to 83%. Primisulfuron was more phytotoxic to downy brome at alternating temperatures of 8 to 16 C and 16 to 24 C than at 0 to 8 C. Phytotoxicity of primisulfuron was less when downy brome plants were stressed for soil moisture after herbicide treatments than when the plants were not stressed or only stressed before treatment.

Keywords

Primisulfuron, 2-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino] sulfonyl]benzoic aciddowny brome, Bromus tectorum L. # BROTEKentucky bluegrass, Poa pratensis L.Adjuvantherbicide placementPoa pratensisBROTEGR50, 50% growth reductionMSO, methylated seed oil
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 461 - 465
Copyright
Copyright © 1999 by the Weed Science Society of America 

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