Cleveland, C.R. 1931 An experiment with summer oil for the control of the European elm scale (Gossyparia ulmi L.).. Journal of Economic Entomology 24: 349-355.
Notes: Detailed directions for chemical control.
Cleveland, C.R. 1931 An experiment with summer oil for the control of the European elm scale (Gossyparia ulmi L.).. Journal of Economic Entomology 24: 349-355.
Notes: Detailed directions for chemical control.