64 Farmers’ Bulletin 1169. 
Evidence of infestation—In April and May brownish boring dust 
and wet spots are to be seen on the bark of the trunks and branches, 
and as the season advances wet spots and yel- 
lowish boring dust mixed with liquids are 
present in increasing quantity. Leaf buds 
fail to open, the foliage is dwarfed or faded 
and sickly, and branches and small trees 
break down. The frequent occurrence of the 
adults in the period from August to October, 
particularly on goldenrod flowers, indicates 
the presence of the insect in injurious 
numbers. 
Description and habits—The locust borer 
is a whitish, elongate, roundheaded grub (fig. 
43, a). It hatches from an egg laid by a 
black, longhorned beetle (fig. 43, >) with yel- 
low, zigzag stripes. The eggs are laid in 
crevices of the bark during the period from 
August to October and the young borers that 
hatch from them excavate individual cells in 
the outer layers of the inner, living bark, 
where they overwinter. In the spring they 
bore into ‘the wood, where they change to 
pupe during July and August and to beetles 
during August and September, whereupon the 
beetles bore exit holes and come out to mate 
and resume the life cycle. This beetle is a 
lover of and works in the sunlight, therefore 
shaded trunks and branches are not subject to 
its attack—a fact which, if borne in mind in 
connection with the care of locust plantations, 
will result in the saving of trees. (See Bulle- 
tin 787, United States Department of Agri- 
culture. ) 
Remedy.—F or shade trees and small plan- 
tations or groves, spray infested trees in the 
Fie. 43.—Section of spring, when these trees begin to show green, 
seus ed Recents ae with poisoned kerosene emulsion (p. 12-13) or 
the locust borer. Shows miiscible-oil solution (p. 12, 13). This will 
ceive dae vers kill the young borers in the bark. 
larva at a, and the bee- Control—Cut locust trees for posts, etc., 
cna R during the dormant season, and peel and 
promptly burn the bark and branches to destroy the borers in the 
bark. In May and June (not later than the falling of the locust 
flowers) cut and burn all badly infested trees, 
