Hough, W.S. 1932 The efficiency of tar distillate sprays in controlling San José and scurfy scales in 1931.. Journal of Economic Entomology 25: 613-617.

Notes: Various concentrations of tar distillates are evaluated for control of Aspidiotus perniciosus in apple orchards. Other species discussed include Chionaspis furfura, Lecanium and Lepidosaphes ulmi.