New York AGRICULTURAL EXPERIMENT STATION. 369 
CONTROL OF LEAF-BLISTER MITE IN APPLE 
ORCHARDS.* 
bia bARROUT 
SUMMARY. 
Conspicuous spotting of foliage by the leaf blister-mite is gen- 
eral throughout the appie-growing areas of western New York. 
The continued attacks of this pest for successive years affect un- 
favorably the growth of the trees in the worst infested orchards, 
and, while the losses are not easily measured, crop yields are un- 
questionably being reduced in proportion to the severity of the in- 
festation and according to the character of the management of 
the orchard. 
The mite spends the winter under the bud scales and it is most 
susceptible to treatment during the late fall when the majority of 
leaves have dropped or during the spring before the new foliage 
appears. The efficient remedies for the blister-mite are the lime- 
sulphur wash, oil emulsions and miscible oils. Orchards that are 
regularly sprayed with these mixtures are not subject to injuries 
by the mite. — : 
Comparative tests of the boiled lime-sulphur wash, the home- 
made concentrated lime-sulphur wash, and two commercial prepa- 
rations gave equally satisfactory results. One application of either 
of these sprays has practically prevented spotting of foliage by the 
mite. 
With the increased availability of the sulphur sprays these are 
now practicable remedies for the treatment of apple orchards for 
the blister-mite. In employing these remedies for this purpose, a 
plan of spraying well adapted for the treatment of apple trees is 
an application of a sulphur wash as the buds are swelling and 
before the leaves appear, followed by the usual second and third 
applications of the bordeaux mixture in their proper season. 
*A reprint of Bulletin No. 306. 
