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Growth Regulator Herbicides Prevent Invasive Annual Grass Seed Production

Published online by Cambridge University Press:  20 January 2017

Matthew J. Rinella*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 243 Fort Keogh Road, Miles City, MT 59301
Marshall R. Haferkamp
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 243 Fort Keogh Road, Miles City, MT 59301
Robert A. Masters
Affiliation:
Dow AgroSciences, LLC, 9330 Zionsville Road, Indianapolis, IN 46268
Jennifer M. Muscha
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 243 Fort Keogh Road, Miles City, MT 59301
Susan E. Bellows
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 243 Fort Keogh Road, Miles City, MT 59301
Lance T. Vermeire
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 243 Fort Keogh Road, Miles City, MT 59301
*
Corresponding author's E-mail: matt.rinella@ars.usda.gov

Abstract

Auxinic herbicides, such as 2,4-D and dicamba, that act as plant growth regulators are commonly used for broadleaf weed control in cereal crops (e.g., wheat, barley), grasslands, and noncroplands. If applied at late growth stages, while cereals are developing reproductive parts, the herbicides can reduce seed production. We tested whether growth regulators have this same effect on the invasive annual grass Japanese brome. The herbicides 2,4-D, dicamba, and picloram were applied at typical field use rates to Japanese brome at various growth stages in a greenhouse. Picloram reduced seed production nearly 100% when applied at the internode elongation, boot, or heading stages of growth, whereas dicamba appeared to be slightly less effective and 2,4-D was much less effective. Our results indicate it may be possible to control Japanese brome by using growth regulator herbicides to reduce its seed production, thereby depleting its short-lived seed bank.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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