Two Scale Insects, Their Bionomics and Control

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The pine-leaf scale, Chionaspis Pinifoliae Fitch, which infests various pines in private and park plantings and the magnolia soft scale, Neolecanium cornuparvum Thro., which infests magnolias are susceptible to the effects of certain contact insecticides, notably oils. There is a considerable interval of time when the young nymphs of the pine-leaf scale are unprotected by a waxy scale and when they can be hit with a covering spray while the nymphs of the magnolia scale are in a vulnerable condition from October to the middle of April. Satisfactory control of these two scales has been obtained by timely applications of oil emulsions.

Document Type: Research Article

Publication date: February 1, 1929

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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