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In recent years new forms of cyanide have been developed which are known as cyanides of calcium. Such compounds are more or less unstable and ad vantage is taken of this property by simply exposing them, in a finely divided form, to the atmosphere in order to have hydrocyanic acid gas liberated. This method of fumigation particularly as applied to citrus was developed by the writer in California in 1922 and in the following year he introduced it into Australia where it has now largely replaced the older methods of fumigation, It is also used as an effective method of controlling the rabbit which is the leading pest of that country. During the past year a practically pure calcium cyanide has appeared which overcomes the chief objection to the first material in that the dust residue is not so injurious to the tree in sections having a moist atmosphere. Hydrocyanic acid in dust form escapes through canvas covers less readily than does the same gas from liquid hydrocyanic acid. The method of application is simply to blow the cyanide dust under the tented tree or space and the moisture of the air in contact with the dust particles generates the gas.
Document Type: Research Article
Publication date: February 1, 1927
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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