Hydrogenation Refining vs. Efficiencies of Spray Oils Against Citrus Red Mite Eggs and California Red Scale1

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Four types of oils typifying naphthenic VB. paraffinic composition at comparable and different viscosity and distillation ranges were prepared as pairs, one refined by solvent extraction to 92 U.R. and the other given an additional treatment of mild hydrogenation. Each oil was used with each of 2 emulsifiers in laboratory dosage-mortality spray trials against eggs of citrus red mite, Panonychud citri (McGregor), and adult female California red scale, Aonidiella aurantii (Maskell). The LD95 values were calculated by a computer using the maximum likelihood solution of probit analysis. Efficiencies of the oils treated with extraction plus mild hydrogenation are as good as those of the comparable oils refined by solvent extraction alone. The efficiency of the oils formulated with the oil-soluble emulsifier was distinctly better against citrus red mite eggs than that of the sallie oils applied with blood albumin spreader, and the data indicate that the emulsifier may have a role in the performance of spray oils against California red scale.

Document Type: Research Article

Publication date: August 1, 1964

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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.
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