The Response of California Red Scale to Fumigation with Ethylene Dibromide and Ethylene Dibromide-HCN1

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Abstract
Ethylene dibromide was tested as a fumigant on resistant and non-resistant strains of the California red scale, Aonidiella aurantii. There was no difference in kill between the 2 strains of red scale, and there was very little difference in the susceptibility of the various stages of red scale when fumigated with ethylene dibromide. The results of fumigation of both strains of red scale with HCN gas are given for comparison. Although practically all of the adult red scales fumigated with a dosage of 15.5 mg. of ethylene dibromide per liter died, they lived long enough after fumigation to produce young. When mixtures of ethylene dibromide and HCN were used as the fumigant, the toxic effect appeared to be from the HCN and not from the ethylene dibromide. Red scales exposed to a low (stupefying) dosage of HCN prior to fumigation with ethylene dibromide were more difficult to kill than those not receiving the HCN conditioning treatment.

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