Whitewash found harmless in applications on walnut leaves

Foott, J; Heinicke, D

Whitewash found harmless in applications on walnut leaves

Authors

J. H. Foott
D. R. Heinicke

Authors Affiliations

J. H. Foott is Farm Advisor, Salt Luis Obispo County, University of California, Agricultural Extension Service; D. R. Heinicke is Pomologist, Canada Department of Agriculture (developer of the CO airstreams measuring device used in these tests).

Publication Information

Hilgardia 21(3):2-3. DOI:10.3733/ca.v021n03p2b. March 1967.

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Abstract

Whitewash applied to the leaves of Persian walnut trees of the Payne variety showed no injury to the leaf and did not interfere with photosynthesis. There was no significant effect on total yield in the whitewash tests, but the percentage of larger, sound nuts increased. These studies also indicated that temperatures above 90°F were very detrimental to photosynthesis and temperatures of 95°F or above stopped it completely.

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