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Emergence of Fourwing Saltbush After Spraying Shrubs by Picloram

Published online by Cambridge University Press:  12 June 2017

S. Clark Martin ,
Samuel J. Shellhorn  and
Herbert M. Hull
S. Clark Martin
Affiliation:
Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dep. of Agr., Tucson, Arizona
Samuel J. Shellhorn
Affiliation:
Crops Research Division, Agr. Res. Serv., U.S. Dep. of Agr., Tucson, Arizona
Herbert M. Hull
Affiliation:
Crops Research Division, Agr. Res. Serv., U.S. Dep. of Agr., Tucson, Arizona
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Abstract

Aqueous sprays of 4-ammo-3,5,6-trichloropicolinic acid (picloram) (1 lb aehg) were applied to individual plants in stands of burroweed (Haplopappus tenuisectus (Greene) Blake) and creosotebush (Larrea tridentata (DC.) Coville) August 27 to 31, 1965, to prepare the areas for seeding to fourwing saltbush (A triplex canescens (Pursh) Nutt.). By July 1967, 99% of the burroweed was dead, but 90% of the creosotebush was still alive. Samples of the surface ½ inch of soil, taken February 1, 1966, were planted to fourwing saltbush. Emergence and growth of fourwing saltbush were seriously reduced on soil taken from under the sprayed burroweed crowns. Growth of fourwing saltbush seedlings was retarded on soils from beneath sprayed creosotebushes, but emergence was not reduced significantly. The surface soil under sprayed burroweed crowns contained 0.11 ppm picloram 2 years after treatment, but the picloram test was negative on soils from the creosotebush area.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 3 , May 1970 , pp. 389 - 392
Copyright
Copyright © 1970 Weed Science Society of America 

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References

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