Yetter, W.P. 1926 Notes on insect pests.. 17th Annual Report - State Entomologist of Colorado 11-15.
Notes: Scales discussed include Gossyparia spuria, Lepidosaphes ulmi, Pulvinaria vitis, Aspidiotus perniciosus, A. ancylus and A. howardi.
Yetter, W.P. 1926 Notes on insect pests.. 17th Annual Report - State Entomologist of Colorado 11-15.
Notes: Scales discussed include Gossyparia spuria, Lepidosaphes ulmi, Pulvinaria vitis, Aspidiotus perniciosus, A. ancylus and A. howardi.