342 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE VI 



WHERE SPRAYING IS IMPRACTICABLE 



A white ash grove badly infested with oyster shell bark louse (Lepidosaphes 

 ulmi). In this instance spraying to control the scale was not practicable be- 

 cause of the height of the trees and the woodlot therefore was cut prematurely. 



