New York AGRICULTURAL EXPERIMENT STATION. 259 
dice against the use of arsenicals on rapidly developing small fruits 
and because hellebore does not disfigure either fruit or leaves. 
It was concluded in these experiments, that, although the sawfly 
is capable of doing serious injury, often ruining the entire crop of 
fruit, it is not a difficult pest to combat. Special emphasis is laid 
on the importance of recognizing the presence of the eggs or the 
young larvae when they first appear, so that the necessary steps 
can be taken to check the insect by spraying before serious injuries 
are done. 
APPLE AND PEAR MITES. 
(Eriophyes spp.) 
Attention was directed to this group of mites because of the 
abundance of one species on apple foliage in 1902 at Williamson, 
where its conspicuous ravages attracted much attention. In suc- 
ceeding years the mite has increased in importance and marked in- 
festations of many apple orchards in Wayne, Ontario, Monroe, 
Niagara, Livingston, Wyoming, Seneca and Yates counties have 
been noted. It is now a common pest in the important apple-grow- 
ing sections of western New York, where during 1906 it was 
especially prominent and very destructive. 
A somewhat similar trouble upon pears, produced by the leaf 
blister mite (Eriophyes pyri (Pgst.) Nal.) has been known for many 
years and has been given widespread mention in literature, but 
there has been some doubt as to the identification of the species 
thriving on the apple foliage. One of the first objects of this inves- 
tigation*® was to establish the identity of the apple mite, which 
was subsequently shown to be the same species that thrives on the 
pear. The work of the mite upon the apple and the pear shows 
differences, which would at first suggest that the causal agent of 
the diseased foliage was not the same for each fruit. Upon the 
pear the work of the mite first appears as minute greenish pimples, 
with a more or less reddish tinge. With increase in size the affected 
spots become reddish and later with the drying up of the diseased 
tissue turn to a dark brown or black. The galls are usually ar- 
ranged in a row on each side of the main rib. The early attacks 
of the mite on apple are indicated by distinct light colored pimples 
which later develop to corky spots of a reddish brown color. The 
galls are of irregular size and are unevenly distributed, though the 
7° Bul. 283; same in Rpt. 24:2907-334 (1906). 
