462 Report oF THE HORTICULTURIST OF THE 
latter part of April. The eggs are laid near the tips of the new 
growth. They hatch within a few days. The little white maggots 
which emerge from them burrow into the pith of the shoot. Ac- 
cording to Slingerland™ they burrow downward in the pith until 
they have reached about half the length of the canes when they 
work nearly out to the bark and each makes a tunnel around the 
shoot, thus girdling it from the inside. They continue feeding on 
the pith at the point where the girdling was done, almost severing 
the shoots. After doing this injury the maggots proceed to mur- 
row downward in the pith, finally reaching the base of the shoots 
where they transform to the pupa stage. This point in their 
development is probably reached, some time in June. They re 
main in this condition until the following April. 
Treatment.— As the insects work inside the shoots they cannot 
be reached with a spray. Undoubtedly the most practical method 
of treatment consists in cutting off the wilted shoots several inches 
below the wilted portion. 
SAW FLY. 
(Monophadnoides rubi Harr.) 
Description.— The adult insects are about the size of a house- 
fly. They appear in the spring and are most abundant in May. 
The eggs are laid from the under side of the leaf within the leaf 
tissue. They are usually placed along the midrib and larger veins. 
The tissue above the eggs turns a light brown in color, causing 
the infested leaves to become spotted. The eggs hatch in about a 
week. The young larve are light green in color and are well cov- 
ered with spine-bearing tubercles. They feed at first on the softer 
tissues, but finally the entire leaf with the exception of the mid- 
rib and larger veins is devoured. They also have been known to 
feed on the tender bark of the new growth and to do some injury 
to the flowers and fruit. Toward the latter part of June they go 
into the ground near the bushes upon which they have been feed- 

52 Cornell Univ. Agr. Exp. Sta. Bul. 126, p. 58. 
