Quayle, H.J., & Rohrbaugh, P.W. 1934 Temperature and humidity in relation to HCN fumigation for the red scale.. Journal of Economic Entomology 28: 1083-1095.

Notes: Temperatures between 50 and 90 degrees during the period of fumigation exposure made no significant difference on the kill of Aonidiella aurantii. Temperatures to which the scales on lemon fruits were subjected previous to the fumigation had a marked effect on the fumigation results. With active insects a higher temperature at the time of HCN fumigation, or previous to the fumigation, is generally conceded to result in a higher percentage of kill. Conditioning at low temperatures results in a higher percentage of kill by fumigation. No significant differences were indicated in these studies as the effect of humidity, within a range of from 50 to 80 percent, on fumigation results on the red scale.