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Response of Soil Algae to Picloram-2,4-D Mixtures

Published online by Cambridge University Press:  12 June 2017

J. H. Arvik ,
D. L. Willson  and
L. C. Darlington
J. H. Arvik
Affiliation:
Air Force Armament Laboratory, Eglin AFB, Florida
D. L. Willson
Affiliation:
Winona State College, Winona, Minnesota
L. C. Darlington
Affiliation:
Central Washington State College, Ellensburg, Washington
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Abstract

The effects of an approximate 1:4 commercial mixture of 4-amino-3,5,6-trichloropicolinic acid (picloram) and (2,4-dichlorophenoxy)acetic acid (2,4-D) on a natural population of soil algae were studied at dosages of 0.28, 0.56, and 1.12 kg/ha of picloram. No change in the composition of the algal flora was noted over an 18-month period, regardless of dosage. In vitro studies indicated that mixtures of picloram and 2,4-D inhibited growth of Chlorella vulgaris Beyer. at concentrations above 100 ppm, but concentrations above 250 ppm were needed for growth inhibition of Cylindrospermum licheniforme (Bory) Kuetz. or Chlorococcum sp. Picloram alone inhibited all three algae at 50 ppm, while 2,4-D produced no inhibitory effects at concentrations less than 400 ppm.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 3 , May 1971 , pp. 276 - 278
Copyright
Copyright © Weed Science Society of America 

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