A Colorimetric Method for the Determination of Oil Deposit on Citrus Leaves

Authors: MCCALL, G. L.; KAGY, J. F.

Source: Journal of Economic Entomology, Volume 33, Number 6, December 1940 , pp. 905-908(4)

Publisher: Entomological Society of America

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The determination of the quantity of petroleum oil deposited on the leaves of a citrus tree by various spray emulsions has been the subject of considerable discussion and research. It is of primary importance to know the amount of oil deposited, in order to correlate the data with the factors of insect toxicity and injury to the tree. When oil sprays are tested to ascertain their respective toxicity to insects, it is very easy to draw erroneous conclusions with regard to differences in effectiveness. In reality, the apparent differences may be due to the fact that under a given set of conditions one spray emulsion will deposit a larger amount of oil than will another. A slight change in the physical or chemical properties of the emulsion may affect the results very markedly (Hensill & Hoskins 1935, Ben-Amotz & Hoskins 1937, Brown & Hoskins 1939). The accurate determination of the oil deposited is therefore of the greatest importance.

Document Type: Research Article

Publication date: December 1, 1940

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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