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Effects of Herbicides on the Capacity of Spring Parsley to Photosensitize Chickens

Published online by Cambridge University Press:  12 June 2017

M. Coburn Williams
M. Coburn Williams*
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, in cooperation with the Utah Agricultural Experiment Station, Logan, Utah
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Abstract

Spring parsley [Cymopterus watsonii (Coult. & Rose) Jones] was examined for phototoxicity by chick (Gallus domesticus, Arbor Acre 50 x Vantress hybrid) bioassay, after treatment with 2,4,-dichlorophenoxyacetic acid (2,4-D), 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), 4-amino-3,5,6-trichloropicolinic acid (picloram), and an approximate 4 to 1 mixture of 2,4-D and picloram. Spring parsley leaves treated with picloram and picloram-2,4-D were much less phototoxic to chicks than controls 4 weeks after treatment. When treatment was followed by warm weather, leaves treated with 2,4-D and 2,4,5-T were not phototoxic 4 weeks after treatment at the highest single dose that could be administered.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 3 , July 1968 , pp. 350 - 352
Copyright
Copyright © Weed Science Society of America 

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References

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