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Herbicide Dispersal Patterns: I. As a Function of Leaf Surface

Published online by Cambridge University Press:  12 June 2017

F. D. Hess ,
D. E. Bayer  and
R. H. Falk
F. D. Hess
Affiliation:
Dep. of Botany, Univ. of California, Davis, CA 95616
D. E. Bayer
Affiliation:
Dep. of Botany, Univ. of California, Davis, CA 95616
R. H. Falk
Affiliation:
Dep. of Botany, Univ. of California, Davis, CA 95616
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Abstract

The distribution pattern of MCPA ([(4-chloro-o-tolyl)oxy] acetic acid) on leaf surfaces of three species was studied using the cathodoluminescence detection mode of a scanning electron microscope. On low-wax-content sugarbeet (Beta vulgaris L.) leaves MCPA concentrated in the depressions over the anticlinal cell walls when applied at high volumes (748 and 374 L/ha). At low volumes (23 L/ha), numerous small deposits of MCPA were randomly distributed over both anticlinal and periclinal walls. These distinct patterns were independent of herbicide concentration. Regardless of spray volumes, MCPA remaining on the waxy leaf surfaces of cabbage (Brassica oleracea L.) coalesced into small thick deposits. Large spray drops from high application volumes shattered on impact with the stellate hairs of turkey mullein (Eremocarpus setigerus Benth.) resulting in some MCPA reaching the leaf surface. Spray drops from low application volumes did not shatter but lodged on the hairs with very little reaching the leaf surface.

Type
Research Article
Information
Weed Science , Volume 22 , Issue 4 , July 1974 , pp. 394 - 401
Copyright
Copyright © 1974 by the Weed Science Society of America 

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References

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