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Copper sulphate solutions of known strength containing 5 per cent sugars were fed to potato leafhopper (Empoasca fabae Harris) nymphs through capping membranes. Dilutions to and including a 1 :6,500 (.0012 N) gave a rather high degree of toxicity. These nymphs lived for an average of 12 days upon a 5 per cent sugar solution and an average of three days upon distilled or tap water. The supernatant fluid from a 4-6-50 Bordeaux mixture obtained after two hours' setting, combined with,) per rent sugar, gave a 14-day average survival. Roots of bean plants were placed in different dilutions of copper sulphate solutions, and leafhoppers were allowed to feed upon these plants. A high rate of mortality was obtained in these tests, and copper was found by chemical tests to be present in the plant juices of these leaves. Spray solutions of copper sulphate and of calcium hydroxide were used on different plants, and nymphs were placed on each of these. The copper-sulphate- treated plants showed considerable toxicity while the calcium hydroxide did not affect the leafhoppers.
Document Type: Research Article
Publication date: April 1, 1930
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.