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Further Data on the Use of Calcium Cyanide as a Greenhouse Fumigant

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Comparative results of three series of fumigation tests in a box of 200 cubic feet capacity, using Ca(CN)2 dust and granular Ca(CN)2 at rates of ½ ounce per 1,000 cubic feet, and NaCN at the rate of ¼ ounce per 1,000 cubic feet with exposures lasting from 1 to 7 hours inclusive, and 15 hours, (or all night), on four species of aphids, namely, Myzaphis sp. on rose,Aphis rumicis on nasturtium, and Marrosiphoniella sanborni and Rhopalosiphum rufomaculata on chrysanthemum, are presented in the table. Overnight fumigation gave 100% mortality in each test.

Twenty-five large commercial greenhouses were fumigated recently using ¼ ounce of granular Ca(CN)2 for each 1,000 cubic feet of space, all night and an excellent control of Myzaphis sp. with negligible burning on roses resulted. Other tests gave similar results with Myzus persicaeon carnations, lliinoia pisi on sweet peas, and M. sanborni on chrysanthemums. A one-ounce dosage in orchid houses killed 100% Boisduval scale, Diaspis boisduvalii, and 52% of the chaff scale, Parlaloria proleus without injury to flowers.

Ca(CN)2 is given off rather slowly and may require longer exposure than NaCN. It is however easier to use and, for that reason, may be more generally adopted by florists.

Document Type: Research Article

Publication date: February 1, 1925

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  • 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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