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Experiments with Hydrocyanic Acid Gas against the San Jose Scale

, : Experiments with Hydrocyanic Acid Gas against the San Jose Scale. Z. angew. Ent, Berlin, 27: pt. 3, 496-502

The experiments described were made to ascertain the dosages and exposures required to control Aspidiotus perniciosus, Comst., by means of fumigation with hydrocyanic acid gas under the conditions obtaining in practice in Austria. Calcium cyanide was used in the form of Calcid briquettes, which amount of hydrocyanic acid gas equal to half their weight. It was also sought to ascertain whether the dosage prescribed against Phylloxera on grape vines (5 oz.


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