Hints at New Spray Procedures

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The standard spray schedule provides for the control of the more important apple insects. It displays some weaknesses against certain species during seasons when weather conditions prevent timely applications. Investigations have been conducted to find materials or practices that will amplify present means of control of rosy aphids and bud moth. Three methods have been tested; viz., (1) autumn defoliation, (2) fall spraying, and (3) winter treatment. Sodium nitrate proved the best material for rendering the trees unattractive to the rosy aphid, and apparently is safe to the twigs. None of the defoliation materials controlled bud moth. Fall spraying with nicotine or ground tobacco killed the fall migrants and the egg-laying females of the rosy aphid, but the utility of this means of control remains to be determined. Winter treatment with tar distillate sprays were very effective against apple aphid eggs and the nymphs of the spruce gall aphid, but proved ineffective against the eggs of the leaf roller. These washes appear to be safe to the trees . As regards rosy aphid, these methods of treatment, if successful, may prove of value in that the period of spraying could possibly be extended.

Document Type: Research Article

Publication date: February 1, 1931

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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