New YORK AGRICULTURAL EXPERIMENT STATION. 327 
How seriously an orchard should be infested before it is advis- 
able to apply spraying mixtures is a question which the individual 
must determine for himself, as he is in a better position to watch 
the progress and to note the effects of the mite upon the foliage 
and to decide what are the probable results of the infestation upon 
fruit yields. From the observations that have been made upon the 
behavior of the mite in this State as an apple pest, it has been 
apparent that it varies in destructiveness in different orchards and 
in different years. This conduct of the mite appears to be due 
to the attacks of Gamasides, a group of closely related mites, which 
are its most formidable enemies. This is one of the hopeful feat- 
ures of the present invasion of the mites and should be given due 
weight in considering the advisability of spraying. Many orchards 
that are slightly infested may safely be allowed to run their chances 
for the present, recourse to treatment being taken upon the increase 
of the mite in sufficient numbers to affect the growth of the leaves 
and to cause their premature falling. © But orchards that are over- 
run with mites should be sprayed. The leaves play an important 
role in determining the fruit yields, and trees that are subject to 
serious infestation of the leaves by the mite, accompanied by undue 
and unseasonable defoliation, such as has occurred during the past 
two years by the pest, would certainly produce smaller crops. 
On pear trees— The progress of the blister-mite upon pear trees” 
may often be checked by simply pruning out and destroying by 
fire the infested twigs at the first appearance of injury. If the 
infestation is general the trees should be sprayed according to the 
directions given for the treatment of apples. Trees that are 
infested with the San José scale as well shoull be sprayed with 
the boiled lime sulphur wash which will control both the scale and 
the blister-mite. 
PLO CE Ser Yn imeieshRiOLATA NAY. 
Phytoptus pirt var. variolatus, Natepa, A., Ang. K. Akad. Wiss. [Vienna], 
29:16. 1892. 
Eriophyes piri var. variolata, NaLepa, A., Das Tierreich, Acarina, Eriophyide, 
1808, p. 25. 
This differs from Eriophyes pyri by the very coarse punctuation 
of the abdomen. Specimens of this species were detected by Dr. 
Nalepa in microscopical mounts of Eriophyes pyri, collected from 
