TWENTY-FIFTH REPORT OF STATE ENTO.\I0LO(4IST 



3.^ 



In the above sprayins^ t\vo eoiuhiiiation.s of materials were used. 

 One was a nicotine sulphate, 1 to 8U0. witli the addition of about 3 

 pounds of dissolved laundry soap to 50 gallons of spray. The other 

 was a combination of nicotine sulphate, 1 to 800, togeth'n- with 

 Orthol K summer spray oil at 4 per cent strength. The former gave 

 95 per cent control, the latter 98 per cent. The oil could have been 

 reduced to 2 per cent and about the same kill obtained. It is believed 

 that a third spray is also necessary shortly before pickiug time to 

 destroy stray migrants. 



Further studies on control and on the life history of the black 

 cherry aphis will be made in 1935. 



r 



Figure 7. — Young cherry tree showing a distorted 

 terminal growth caused by a heavy infestation of 

 the black cherry aphis the previous season. 



