Yust, H.R., Nelson, H.D., & Busbey, R.L. 1942 The stupefaction of California red scale with sublethal dosages of hydrocyanic acid.. Journal of Economic Entomology 35(3): 339-342.

Notes: It was previously observed that exposure of Aonidiella aurantii, to a sublethal concentration of hydrocyanic acid prior to fumigation with a normally lethal concentration reduced the kill. This protective stupefaction effect is investigated in this study.