254 MONTANA EXPERIMENT STATION. 



20, Grasshoppers. 



Young grasshoppers sometimes crawl up the trunks of trees and 

 devour the foliage. Later when they acquire wings they tiy into the 

 trees. 



Remedy. — Spray the foliage heavily with arsenate of lead. To 

 prevent the young from ascending the trees ; tie belts of cotton about 

 the trunk or smear printer's ink or some other adhesive material 

 ->n a band of paper on the trunk. 



21, The Clover Mite. 



Giving the leaves of apple and other trees a whitish devitalized 

 appearance. In the fall of the year and during the winter masses of 

 very minute reddish eggs may be found on the trees, particularly 

 in the crotches. The mites sometimes become annoying on lawns 

 and in dwellings by crawling through the windows. 



Remedy. — Spray affected trees with the 1-1-4 formula of lime- 

 sulphur wash in the fall or early spring, while the trees are bare of 

 leaves. Spray with kerosene emulsion to destroy the pest in the vi- 

 cinity of the house. 



INSECTS INJURIOUS TO THE PEAR. 



22, The Pear-leaf Blister-mite. 



Generally distributed in Western Montana. Causing thickened 

 reddish spots and blotches on the leaves of pear; later in the season 

 the spots die and turn brown, sometimes causing the foliage to drop 

 prematurely. Serious on individual trees but does not spread very 

 rapidly. 



Remedy. — To prevent spreading, gather and burn the fallen 

 leaves from invested trees. Spray in the spring before the buds 

 open with the 1-1-4 lime-sulphur wash. 



23, The Pear Slug. 



Injurious to the leaves of pear, plum and cherry. Slimy slugs 

 on the upper side of the leaves, eating off the surface parts, leaving 

 the under surface and the network of veins, which later turn brown, 

 giving the parts of the tree affected a brownish appearance. 



Remedy. — Spray with arsenical poisons or dust or spray with 

 hellebore. 



