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The Response of Native Grasses and Forbs to Picloram

Published online by Cambridge University Press:  12 June 2017

W. R. Arnold  and
P. W. Santelmann
W. R. Arnold
Affiliation:
Department of Agronomy, Oklahoma State University, Stillwater
P. W. Santelmann
Affiliation:
Department of Agronomy, Oklahoma State University, Stillwater
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Abstract

In the greenhouse, picloram (4-amino-3,5,6-trichloropicolinic acid) prevented germination of side-oats grama [Bouteloua curtipendula (Michx.) Torr.,] big bluestem (Andropogon gerardi Vitman), switchgrass (Panicum virgatum L.) and blue grama [Bouteloua gracillis (HBK) Lag.] when applied preemergence. When applied at 1.5 lb/A or more at the two-leaf stage in the greenhouse and field, picloram significantly reduced plant numbers of all species. Of the four species big bluestem appeared to be the most tolerant to picloram in the seedling stages. Germination was reduced when 2,4-D (2,4-dichlorophenoxyacetic acid) was applied preemergence to side-oats grama and the plant numbers of this species and switchgrass were reduced when treated at the two-leaf stage.

The application of picloram to established native range did not reduce forage production or desirable plant frequency. All treatments reduced forb production. Picloram gave very good control of western yarrow (Achillea lanulosa nutt.), white heath aster (Aster ericoides L. nutt.), and western ironweed (Vernonia baldwini Torr.). White sage (Artemisia ludoviciana nutt.) was resistant to 4 lb/A of picloram.

Type
Research Article
Information
Weeds , Volume 14 , Issue 1 , January 1966 , pp. 74 - 76
Copyright
Copyright © 1966 Weed Science Society of America 

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References

Literature Cited

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