List, G.M. 1920 The European elm scale (Gossyparia spuria, Modeer.). Circular of the Colorado State Entomologist 29: 1-12.
Notes: Description, life history, control measures.
List, G.M. 1920 The European elm scale (Gossyparia spuria, Modeer.). Circular of the Colorado State Entomologist 29: 1-12.
Notes: Description, life history, control measures.