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Etiolated Growth of Range Grasses for an Indication of Tolerance to Atrazine

Published online by Cambridge University Press:  12 June 2017

J. A. Young  and
R. A. Evans
J. A. Young
Affiliation:
Sci. and Ed. Admin., Federal Research, U. S. Dep. Agric., Renewable Resource Center, Univ. of Nevada, 920 Valley Rd., Reno, NV 89512
R. A. Evans
Affiliation:
Sci. and Ed. Admin., Federal Research, U. S. Dep. Agric., Renewable Resource Center, Univ. of Nevada, 920 Valley Rd., Reno, NV 89512
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Abstract

Our purpose was to investigate the influence of growth reserves of perennial range grasses on their tolerance to applications of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine]. Competing annual grasses were removed with atrazine treatment at 1.1 kg/ha. The carbohydrate reserves of the perennial grasses were reduced by mowing the previous season. Crested wheatgrass [Agropyron desertorum (Fisch. ex Link) Schult.] plants with reduced carbohydrate reserves, as indicated by reduced etiolated growth, were less tolerant to atrazine than their nonmowed counterparts. Without reduced carbohydrate reserves, squirreltail [Sitanion hystrix (Nutt.) J. G. Smith] was much more susceptible to atrazine than crested wheatgrass. Thus, the weed control treatment did not necessarily increase the density of desirable perennial grasses.

Keywords

Agropyron desertorumSitanion hystrixannual grassesweed controlcarbohydrate reserves
Type
Research Article
Information
Weed Science , Volume 26 , Issue 5 , September 1978 , pp. 480 - 483
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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