New York AgricutturaAL Experiment Stratton. 349 
the eggs or the young larve when they first appear, so that the 
necessary steps ean be taken to check the insect before serious in- 
jury is done. 
Importance in the nursery.— This saw-fly is occasionally found 
in the nursery, where it may do much injury to the young black- 
berries and raspberries. The larve feed upon the new growth 
of the young tips after first devouring the leaves, and hence may 
do serious injury by checking the early growth of the plant. 
FOOD PLANTS. 
As its name indicates, this species feeds principally upon the 
raspberry. Ina large field of raspberries near the Station where 
several varieties are under cultivation, and where the insect has 
been very abundant for nearly four years, the Shaffer bushes have 
suffered most injury each season. In addition to the raspberry, 
the blackberry and dewberry are subject to attack. 
INJURY TO THE PLANT. 
The first injury is caused by the female, which, as stated in 
detail on another page, deposits her eggs on the under side of the 
leaf, just beneath the cuticle. At first no apparent injury results, 
but within a few days the upper surface of the leat immediately 
over the egg turns light green, and finally a light yellow color, the 
tissue becoming dry and somewhat withered. Thus a leaf in. 
which a number of eggs have been placed soon becomes distinctly 
spotted and hence is easily detected. (Plate XXVI, Fig. 4.) 
Where a large number of eggs have been deposited on a single leaf 
nearly the whole leaf becomes lighter in color and appears some- 
what wilted. This is a matter of importance to the grower, for 
by the spotted leaves one may be made aware of the presence of 
the immature brood before the more serious injury caused by the 
young larve takes place. | 
Injury to the leaves and new canes.— The first evidence of the 
work of the larve upon the leaves is the small irregular holes 
