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Effect of Light on the Response of Tomato (Lycopersicon esculentum) and Two Weed Species to Metribuzin

Published online by Cambridge University Press:  12 June 2017

M. K. Pritchard  and
G. F. Warren
M. K. Pritchard
Affiliation:
Dep. Hortic., Purdue Univ., West Lafayette, IN 47907
G. F. Warren
Affiliation:
Dep. Hortic., Purdue Univ., West Lafayette, IN 47907
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Abstract

The response of tomato (Lycopersicon esculentum Mill. ‘Chico III’), jimsonweed (Datura stramonium L.), and velvetleaf (Abutilon theophrasti Medic.) to postemergence applications of metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one] applied after cloudy weather was determined by shading the plants artificially before field application of the herbicide. One day of 76% actual shade reduced the tolerance of tomato, jimsonweed, and velvetleaf to metribuzin, and 3 days of shade further reduced plant tolerance to the herbicide. The GR50 values showed that tomato was about 30 times more tolerant than jimsonweed and about 40 times more tolerant than velvetleaf to metribuzin. After 3 days of shade, 2 or 3 days of sunshine were required to return tomato to its full tolerance to metribuzin. After 3 days of cloudy weather, metribuzin applied at about 55% of the normal dose should control jimsonweed and velvetleaf. Weather conditions before postemergence applications of metribuzin will determine the appropriate timing of application and the herbicide dose.

Keywords

Artificial shadeherbicideweed controlenvironment
Type
Research Article
Information
Weed Science , Volume 28 , Issue 2 , March 1980 , pp. 186 - 189
Copyright
Copyright © 1980 by the Weed Science Society of America 

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References

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