12 Farmers’ Bulletin 1252. 
The entire life cycle from egg to adult occupies approximately 30 
days. In the vicinity of Washington, D. C., there are six of these 
30-day life cycles or generations each season. There is such a great 
overlapping of these generations, due to the irregularity of emergence 
of the overwintering adults and the variation in individual develop- 
ment, that shortly after the first brood all stages may be present at 
the same time. 
THE EUROPEAN ROSE SLUG. 
The European rose slug is probably the next most common rose 
sawfly and is reported as injurious in States as far west as the 
Rocky Mountains. The eggs of this species are laid in pockets in the 
leaf tissue quite near the edge of the leaflet, with the slit at the 
base of one of the leaflet’s serrations and with the egg prominent 
on the underside of the leaflet and protected and held in place there 
by the thin under membrane of the leaf. The larva is yellowish 
green in color with food causing the alimentary tract to appear dark 
olive green. It feeds upon the upper surface of the leaf by a char- 
acteristic chafing method, eating only the soft tissue and leaving 
the veins and under tissues showing yellowish onthe green leaflet. 
When full grown the larva leaves the bush and.enters the ground 
where it constructs a cell, cementing together particles of sand and 
earth to form a capsule-shaped chamber. It is within this cavity 
that the quiescent period is spent. This stage occupies most of the 
year, carrying the species through the summer, fall, and winter 
until the following spring. Thus the life cycle is approximately a 
year in length and the species has only one generation a year. 
THE COILED ROSEWORM. 
The coiled roseworm is not especially abundant in any section of 
the country, but occasionally occurs in sufficient numbers to attract 
attention, either because it bores into the pruned ends of shoots or 
because it feeds on the leaves. It is the former habit that causes it 
to be most frequently the object of inquiry. This species occurs 
from Minnesota to Maine and as far south as northern Virginia. 
Its eggs are laid in the upper surface of the leaflet and not espe- 
cially near the edge, as in the preceding species. The larva which 
hatches begins feeding by skeletonizing patches from the underside 
of the leaflet, leaving only the thin upper skin which appears whitish 
transparent. This method of feeding does not last long, as the larva 
soon begins devouring all of the leaf tissue, first eating holes through 
and then feeding on the entire leaflet, exclusive of the largest veins. 
When full grown this larva searches for a piece of soft wood or 
similar material, and when the pruned ends of rose shoots are avail- 
