26 



CIRCULAR 2 7 0, U. S. DEPARTMENT OF AGRICULTURE 



numerous on the twigs and branches, and control is desired, a con- 

 tact spray, such as nicotine sulfate (40 percent nicotine) in the pro- 

 portion of three-fourths of a pint to 100 gallons of water, added to 

 an oil emulsion, or used with soap or casein spreader, is effective. 



A 



f 









: . . . \ 



5 L 









"W 





Mm 







c 











&Ir - 



Figure 29. — A, Buffalo treehopper; B, green clover treehopper; C, dark-colored 



treehopper. X 3. 



If used with an oil emulsion, this spray may replace one of the lead 

 arsenate sprays in the schedule for controlling the codling moth. 

 On account of the protection afforded the insects by their woolly 

 covering, the spray must be applied very thoroughly and with ade- 

 quate pressure. The oil emulsion alone is not effective. 



