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Metabolic Fate of Monuron and Diuron in Isolated Leaf Discs

Published online by Cambridge University Press:  12 June 2017

C. R. Swanson  and
H. R. Swanson
C. R. Swanson
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Metabolism and Radiation Research Laboratory, State University Station, Fargo, North Dakota 58102
H. R. Swanson
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Metabolism and Radiation Research Laboratory, State University Station, Fargo, North Dakota 58102
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Abstract

Leaf discs of cotton (Gossypium hirsutum L.), broadleaf plantain (Plantago major L.), soybeans (Glycine max Merrill), and corn (Zea mays L.) were incubated 1 hr in aqueous solutions of methyl- or ring-labeled 3-(p-chlorophenyl)-l,l-dimethylurea-14C (monuron) or carbonyl-labeled 3-(3,4-dichlorophenyl)-l,l-dimethyl-urea-14C (diuron). The loss of herbicide and formation of metabolites were determined at approximately 1-hr intervals up to 7 hr. Cotton leaf discs actively metabolized monuron to l-(p-chlorophenyl)-3-methylurea (monomethylmonuron), l-(p-chlorophenyl)urea (p-chlorophenylurea), and p-chloroaniline. Plantain leaf discs strongly metabolized diuron to l-(3-,4-dichlorophenyl)-3-methylurea (monomethyldiuron) and l-(3,4-dichlorophenyl)urea (3,4-dichlorophenylurea). Plantain degraded monuron less actively than diuron and cotton degraded diuron less rapidly than monuron. In soybean leaf discs, metabolism did not progress beyond the first demethylation, and corn leaf discs were unable to metabolize the herbicides in short-term studies.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 2 , April 1968 , pp. 137 - 143
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

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