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Influence of Dicamba on Development of Range Grass Seedlings

Published online by Cambridge University Press:  12 June 2017

J. C. Halifax and
C. J. Scifres
J. C. Halifax
Affiliation:
Dep. of Range Sci., Texas A&M Univ., College Station
C. J. Scifres
Affiliation:
Dep. of Range Sci., Texas A&M Univ., College Station
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Abstract

Seedlings of switchgrass (Panicum virgatum L. ‘Blackwell’), sideoats grama (Bouteloua curtipendula [Michx.] Torr. ‘Premier’), and native vine mesquite (Panicum obtusum H. B. K.) tolerated 0.28 kg/ha of 3,6-dichloro-o-anisic acid (dicamba) applied preemergence. After emergence, sideoats grama tolerated 0.56 kg/ha dicamba. Preemergence or postemergence applications of 1.12 and 2.24 kg/ha severely retarded shoot production of all three species. Soil residues in the surface 2.5 cm reduced root production of grass seedlings, whereas placement of dicamba 7.6 or 15.2 cm deep was not detrimental. All grass species germinated and grew for 21 days in soil containing up to 63 ppb of dicamba without reduction in shoot production. Overall order of susceptibility to dicamba was ranked as vine mesquite > switchgrass > sideoats grama.

Information

Type
Research Article
Information
Weed Science , Volume 20 , Issue 5 , September 1972, pp. 414 - 416
Copyright
Copyright © Weed Science Society of America 

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References

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