6 FARMERS’ BULLETIN 1722. 
another the following spring before the trees put out foliage. If 
both the fall and spring applications are not practicable, the pref- 
erence should be given to fall treatment. At this time many of the 
mites have not yet gone to the bud scales, but occur in the pubescence 
of the young wood and hence are more easily killed. 
Lime-sulphur washes? are excellent treatments for these mites and 
their employment is perhaps preferable as avoiding danger of injury 
to fruit buds by the oil sprays. If a lime-sulphur wash is employed, 
it should be applied with great thoroughness and the tree completely 
coated so that when spraying is finished it will appear as if white- 
washed. 
On the pear the mites may be kept reduced to an important extent 
simply by searching out in the spring small branches bearing worst 
infested leaves, pruning these off and burning them, or sprays may 
be employed exactly as indicated for the apple, if this is considered 
necessary. 
Except in cases of serious infestation special spraying for the 
blister mite will not be necessary. As to whether or not it is ad- 
visable to spray, the orchardists will have to decide after determining 
as exactly as is possible the amount of injury that is being done by 
the mites, and care should be taken not to confound with its injury 
that which has resulted from fungicidal or Paris-green sprays, and 
from leaf-spot diseases. 
1Information concerning the preparation of lime-sulphur washes and kerosene emulsion 
will be found in Farmers’ Butletin 650, U. S. Department of Agriculture, pp. 16—25. 
