252 MONTANA EXPERIMENT STATION. 



Remedy. — Spray the under side of the foliage with kerosene 



emulsion early in the season before the insects acquire wings and 



are able to fly. 



II, Buffalo Tree-hopper. 



Greenish or brownish three-cornered insects which make longi- 

 tudinal slits in the bark of apple, laying their eggs in the slits. 



Remedy. — Prune off and burn affected twigs, practice clean 

 culture, keeping out all weeds and unnecessary vegetation. 



12, Woolly Aphis of the Apple. 



May be detected by the whitish woolly masses on the water- 

 sprouts at the base of the tree and on old scars on the trunk and 

 limbs. The colony masses are made up of the bodies of the lice and 

 cottony secretion produced by them. The most injurious form of 

 the insect feeds on the roots of the trees. 



Remedy. — For the areal form use strong kerosene emulsion 

 early in the season. For the root form dig away the earth down to 

 the roots and soak with hot water and return what has been removed. 



13, The Apple Leaf-aphis. 



Dark-green lice on the leaves of apple, causing them to curl. 

 Common throughout the state. More abundant on young trees. 



Remedy. — When only a few terminal branches are affected, dip 

 the affected parts into a pail of kerosene emulsion. One part in nine 

 of water, or whale-oil soap solution, one pound in eight gallons of 

 tvater. Early in the season it is well to single out individual affect- 

 ed trees ind spray with one of the above solutions. 



14, The San Jose Scale. 



An insect which has caused great destruction in the United 

 States but which would probably be much less injurious in Montana. 

 Minute circular scales on the bark of practically all our common fruit 

 and shade trees. When abundant, giving the trees the appearance 

 of being coated with a layer of ashes. 



Remedy. — Spray with lime, sulphur wash when trees are dor- 

 mant. ,rt 

 15, The Oyster-shell Bark-louse. 



, Brownish scale insects, one-twelfth of an inch long, elongated 



