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Fall-applied Herbicides for Canada Thistle (Cirsium arvense) Root and Root Bud Control in Reduced-till Spring Wheat

Published online by Cambridge University Press:  12 June 2017

William W. Donald*
Affiliation:
Cropping Syst. Water Qual. Res. Unit, Agric. Res. Serv., U.S. Dep. Agric., 244 Agric. Engineering Bldg., UMC, Columbia, MO 65211Formerly of Agric. Res. Serv., Biosci. Res. Lab., Fargo, ND 58105

Abstract

Several sequences of POST herbicides applied each year in fall alone, in spring alone, or both in fall and again in spring controlled Canada thistle stands in spring wheat by severely decreasing root biomass and the numbers of adventitious root buds to a depth of 50 cm over four years. These treatments included dicamba applied at 1.7 or 2.2 kg ae ha–1 for the first two successive falls followed in wheat by either chlorsulfuron at 30 g ai ha–1 plus nonionic surfactant, MCPA plus bromoxynil at 280 plus 280 g ha–1, or 2,4-D amine at 560 g ha–1 applied annually for each of four consecutive years from the start. Chlorsulfuron at 30 g ha–1 applied alone in spring for each of four years also reduced and prevented Canada thistle root growth as effectively as a sequence of fall-applied dicamba followed by spring-applied chlorsulfuron in spring wheat.

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Feature
Copyright
Copyright © 1990 by the Weed Science Society of America 

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