Cooley, R. A Spraying for oyster-shell scale / by R. A. Cooley, J. R. Parker, W. S. Regan - Bozeman, Montana : Agricultural Experiment Station - 15 p. - Montana. Agri. Exp. Sta., Circular; 124 . LCCN: 202154 Subjects--Topical Terms: Lepidosaphes ulmi Aspersion -- Efecto en arboles frutales