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Basis for Response Differences of Two Broadleaf Weeds to Chlorsulfuron

Published online by Cambridge University Press:  12 June 2017

Larry H. Hageman  and
Richard Behrens
Larry H. Hageman
Affiliation:
Dep. Agron. and Plant Genet., Univ. of Minnesota, St. Paul, MN 55108
Richard Behrens
Affiliation:
Dep. Agron. and Plant Genet., Univ. of Minnesota, St. Paul, MN 55108
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Abstract

The basis for differences in response of eastern black nightshade (Solanum ptycanthum Dun.), a tolerant species, and velvetleaf (Abutilon theophrasti Medic. ♯3 ABUTH), a susceptible species, to foliar-applied chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide} was investigated by evaluating differences in spray retention and herbicide absorption, translocation, and metabolism. Based upon a foliar-applied rate causing a 50% reduction in dry weight, velvetleaf was greater than 20000 times more susceptible to chlorsulfuron than was eastern black nightshade. The differences detected in spray retention, absorption, and translocation were inadequate to account for the large response differences between the two species. The primary difference found was in the rate of chlorsulfuron degradation. In eastern black nightshade, 69.9% of the absorbed chlorsulfuron was metabolized within 24 h of application and 81.1% within 72 h of application. Only 7.1% of absorbed chlorsulfuron was metabolized in velvetleaf in a 72-h period.

Keywords

AbsorptionmetabolismretentiontranslocationnightshadeSolanum ptycanthumAbutilon theophrastiABUTH
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 32 , Issue 2 , March 1984 , pp. 162 - 167
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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