A summary of established field practices in the use of petroleum oil sprays for both citrus and deciduous trees is given to date, together with data covering the species of insects concerned and the dosages used for same. Dormant spraying of deciduous trees during the past year has been almost free from complaints of injury due to the better physical condition of the trees and the type of oil commonly used. Spraying of citrus trees is still accompanied with reports of functional disturbances which in part, at least, are considered due to oils of too low volatility. This may be overcome by use of two types of oil of different volatilities. In addition to the sulfonation test, the oxidation rate of oils gives promise of being another specification of value in determining the safety to the plant. The incorporation of nicotine or other active insecticides directly into the oil before emulsifying offers the possibility of increasing the toxicity of the oil itself without increasing the danger to the plant.
Document Type: Editorial
Publication date: August 1, 1928
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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.