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Ethalfluralin Activity in Cucumber (Cucumis sativus)

Published online by Cambridge University Press:  12 June 2017

Jeffrey F. Derr  and
Thomas J. Monaco
Jeffrey F. Derr
Affiliation:
Dep. Hortic. Sci., North Carolina State Univ., Raleigh, NC 27650
Thomas J. Monaco
Affiliation:
Dep. Hortic. Sci., North Carolina State Univ., Raleigh, NC 27650
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Abstract

In greenhouse studies, soil organic matter reduced the herbicidal activity of ethalfluralin (N-ethyl-N-(2-methyl-2-propenyl)-2,6-dinitro-4-(trifluoromethyl)benzenamine). Fifty percent inhibition (I5.0) values for barnyardgrass [Echinochloa crus-galli (L.) Beauv.] stand, injury, and shoot fresh weight increased as the soil organic-matter level increased. No difference in ethalfluralin tolerance was found among 16 cucumber (Cucumis sativus L.) cultivars. When grouped according to market type, fresh market cultivars tended to be injured more than pickling cultivars by excess ethalfluralin. Both shoots and roots of cucumber absorbed the herbicide, but exposure of roots to ethalfluralin was more toxic than exposure of shoots. Field studies indicated that with certain edaphic and environmental conditions, cucumbers can be injured by preemergence applications of ethalfluralin. Injury was greatest in a low organic-matter soil following a heavy rain. Ethalfluralin at 1.3 kg/ha gave adequate weed control in 1 and 3% organic-matter soils, but not in a 9% organic-matter soil.

Keywords

Soil organic mattersite of uptakedinitroanilines
Type
Research Article
Information
Weed Science , Volume 30 , Issue 5 , September 1982 , pp. 498 - 502
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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