THE WOOLLY APHIS. I/ 



were killed by the same treatment as in the previous experiment, 

 and all the shoots developed normally. Thus z out of a total of 

 sixty-three winter mothers on forty-four buds, only one insect 

 survived the treatment. 



Other experiments were made with 12 ounces of caustic soda, 

 12 ounces of carbonate of potash, 4 ounces of treacle, and 8 gallons 

 of water, but every infected bud on ten out of the twelve shoots 

 treated developed into a gall. 



From a knowledge of the life-history, it is evident that for the 

 treatment to be completely successful, the larch, and Pinus abies, 

 if they show any signs of blight in summer, must be sprayed at the 

 same time as the spruce. Apart from other advantages, winter 

 spraying removes two generations of the same insect at one and 

 the same time. 



THE WOOLLY APHIS (AMERICAN BLIGHT). 

 Sckisoneura lanigera, Hausm. 



The complaints of the damage sustained by the attacks of 

 this pest are as numerous as ever. 



I have found nothing to improve upon the sprayfluid men- 

 tioned in my Report for 1903, viz., a \ Ib. of soft soap to \\ gallons 



FIG. V. APPLE SHOOTS ATTACKED BY WOOLLY APHIS. 



of hot water for the branch form, and hot water alone for the root 

 form. 



Mr. J. G. Blakey, of Redditch. to whom I am indebted for the 

 photographs of Figures V and VI, writes me that he finds some 

 varieties of apples much more susceptible to the attacks of this 

 insect than others. He has also been experimenting with treating 



