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Environmental Influences on the Selectivity of Diphenamid in Seeded Tomato (Lycopersicon esculentum)

Published online by Cambridge University Press:  12 June 2017

Robert P. Rice Jr.  and
Alan R. Putnam
Robert P. Rice Jr.
Affiliation:
Pestic. Res. Center, Michigan State Univ., East Lansing, MI 48824. This is a portion of the senior author's thesis for the Ph.D degree
Alan R. Putnam
Affiliation:
Pestic. Res. Center, Michigan State Univ., East Lansing, MI 48824. This is a portion of the senior author's thesis for the Ph.D degree
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Abstract

Several environmental and edaphic factors were monitored to determine their association with tolerance of seeded tomatoes (Lycopersicon esculentum Mill.) to diphenamid (N,N-dimethyl-2,2-diphenylacetamide). Injury increased with increasing soil pH and reduced temperature within 7 days of seeding in both field and growth chamber tests. The application of soluble fertilizer and diphenamid at planting acted synergistically to increase tomato injury. Prior to emergence of the tomato seedlings, 14C-diphenamid uptake was slight but increased with higher temperatures, while growth was inhibited at both low and high temperatures. Uptake and metabolism of 14C-diphenamid by plants in the cotyledon stage was not greatly affected by temperature or pH; however, translocation from the root to the shoot was reduced under low temperatures and high pH. These differences in translocation paralleled reported differences between tolerant and susceptible species, and may account for the increased diphenamid injury to tomatoes grown under stress conditions.

Keywords

Uptaketranslocationmetabolismtolerance
Type
Research Article
Information
Weed Science , Volume 28 , Issue 2 , March 1980 , pp. 176 - 180
Copyright
Copyright © 1980 by the Weed Science Society of America 

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References

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