Sasscer, E.R., & Weigel, C.A. 1924 Recent developments in greenhouse fumigation with hydrocyanic-acid gas.. Journal of Economic Entomology 17: 214-222.

Notes: This treatment proved effective against Idiopterus sp., Illlinoia pelargonii, Orthezia insignis, Chrysomphalus biformis, Parlatoria pergandii, Coccus hesperidum, and C. elongatus; a comparable dosage was not effective against Eriococcus azaleae, Pseudococcus citri or eggs of Coccus elongatus and Pseudaonidia duplex.