SB 
Be No. 32, THIRD REVISE. Issued December 10, 1907. 
C Me ee . 
ENT nited States Department of Agriculture, 
BUREAU OF ENTOMOLOGY. 
THE LARGER APPLE-TREE BORERS. 
By F. H. CurrrenpeEn, 
In Charge of Breeding Experiments. 
Among the most troublesome of the insect pests with which the 
fruit growers of the United States have to deal are two species of bor- 
ing beetles known, from the appearance of their larve, as the round- 
headed and flat-headed apple-tree borers. The first of these belongs 
to the family Cerambycide and the other to the Buprestidae. In ad- 
dition, there is another species called, after the adult form, the spotted 
apple-tree borer and to distinguish it from the round-headed borer, 
which it closely resembles. The two species first mentioned are 
common and injurious throughout a wide extent of country—the 
former to seed fruit trees, the latter also to stone fruit as well as to a 
great variety of forest and ornamental trees. The third is a com- 
paratively rare insect and rather exceptionally injurious so far as 
known. 
THE ROUND-HEADED APPLE-TREE BORER. 
(Saperda candida Fab.) 
Fia. 1.—Saperda candida: a, larva, from side; b, from above; c, female beetle; d, pupa—all 
enlarged one-third (original). 
INTRODUCTORY REMARKS AND DESCRIPTION. 
The round-headed apple-tree borer is, next after the codling moth, 
the worst enemy to apple culture in America. 
The first intimation that the grower may have of the presence of 
this borer in his trees, unless he be forewarned, is in their retarded 
13806—No. 32—07 
