Evaluation of Representative California Spray Oils against Citrus Red Mite and California Red Scale1

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Abstract:

Laboratory spray trials were conducted to determine LD-95 values for several representative California light-medium-grade and medium-grade foliage spray oils against citrus red mite (Panonychus citri (McG.)) eggs and adult female California red scale (Aonidiella aurantii (Mask)). Correlations of LD-95 values and physical-chemical properties of the oils are discussed.

The results obtained lead to the following conclusions. The magnitude of the LD-95 of the oils that were most efficient against citrus red mite eggs is about half that of the LD-95 of the same oils against adult female red scale. The killing action of light-medium-grade and medium-grade California spray oils against citrus red mite eggs is associated with the highest boiling portion of the oil. Five of the 8 oils tested were more efficient against citrus red mite eggs and 7 of the 8 oils were less efficient against adult female California red scale than was expected on the basis of respective values for average molecular weight.

Document Type: Research Article

Publication date: April 1, 1958

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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