Cox, J.A. 1942 Effect of dormant sprays on parasites of the San Jose and terrapin scales.. Journal of Economic Entomology 35(5): 698-701.

Notes: In the laboratory, insecticides commonly used in dormant sprays for orchard pests, were quite toxic to parasites of the Aspidiotus perniciosus and Lecanium nigrofasciatum. Consideration was given to timing of sprays in order to promote an increase in the parasite population.