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Herbicidal Suppression of Bracken and Effects on Forage Production

Published online by Cambridge University Press:  12 June 2017

W. C. Robocker
W. C. Robocker*
Affiliation:
Plant Sci. Res. Div., Agr. Res. Serv., U. S. Dep. of Agr., Wash. State Univ., Pullman, Washington 99163
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Abstract

Nineteen herbicides in various formulations were tested preemergence and postemergence for control of western bracken (Pteridium aquilinum (L.) Kuhn var. pubescens Underw.). Excellent suppression was obtained for 1 year with fall applications of granular formulations of 2,6-dichlorobenzonitrile (dichlobenil) at 6.7 and 10.1 kg/ha, 4-amino-3,5,6-trichloropicolinic acid (picloram) at 2.2 kg/ha, and 3,6-dichloro-o-anisic acid (dicamba) at 4.5 to 9.0 kg/ha. Bracken recovered rapidly after 1 year of suppression by dichlobenil, but other herbaceous species were killed. Bracken recovered considerably the second growing season after application of picloram or dicamba, although morphological effects were noticeable for 2 to 3 years, particularly from dicamba. No visual injury to grasses was apparent from picloram. Some injury to orchardgrass (Dactylis glomerata L.) was noted from dicamba.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 5 , September 1971 , pp. 538 - 541
Copyright
Copyright © Weed Science Society of America 

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References

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