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The Sensitivity of Duckweeds (Lemnaceae) and Azolla to Diquat and Paraquat

Published online by Cambridge University Press:  12 June 2017

R. D. Blackburn  and
L. W. Weldon
R. D. Blackburn
Affiliation:
Agricultural Research Service, U.S. Department of Agriculture, Fort Lauderdale, Florida
L. W. Weldon
Affiliation:
Agricultural Research Service, U.S. Department of Agriculture, Fort Lauderdale, Florida
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Abstract

The sensitivity of giant duckweed (Spirodela polyrhyza (L.) Schleid), common duckweed (Lemna minor L.), Wolffiella floridana (Smith) Thomp., azolla (Azolla caroliniana Willd.), and watermeal (Wolffia columbiana Karst.) to diquat (6, 7-dihydrodipyrido [1,2-a:2’,1′-c] pyrazidiinium salt) and paraquat (1,1′-dimethyl-4,4′-bipyridinium salt) was in that order (most to least sensitive). The rapidity of chlorosis in giant duckweed was directly related to the light intensity. The light quality having the most effect on the activity of diquat and paraquat on duckweed was red (600+ millimicrons), and green (510–560 millimicrons) had the least effect.

Type
Research Article
Information
Weeds , Volume 13 , Issue 2 , April 1965 , pp. 147 - 149
Copyright
Copyright © 1965 Weed Science Society of America 

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References

Literature Cited

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