24 
Colorado Experiment Station 
Plat-Headed Borer. —A light-yellow legless grub that bores be¬ 
neath the bark of apple and many of our shade and forest trees. The 
first body segments are flattened, making the larvae appear to have an 
enlarged flat head. The adult is a dark brown metalic colored beetle 
about three-fifths of an inch long. This insect very seldom attacks any 
but weakened or injured trees. See Fig. 13. 
Fig. 13.—Flat headed Apple-tree Borer; a. flat-headed larvae; b, the mature beetle; c, 
head of mature beetle; d, pupa. All twice natural size. (Chittenden, Circular 32, U. S. 
Dep. of Agr., Div. of Entomology.") 
Remedies. —Keep trees in thrifty condition. Protect from sun 
scald during winter and spring by shading or white-washing (15). 
Remove borers with pocket-knife when found. 
Grasshoppers. —Grasshoppers sometimes eat bark from trees in 
the nursery rows or in young orchards. 
Remedies. —See under Foliage. 
PEACH, PLUM, PRUNE, APRICOT AND CHERRY 
Fruit 
T^vig-Borer of Peach. —The small brown larvae of this insect win¬ 
ter over in silk-lined cavities made in the bark, especially in the 
crotches of small limbs. These are detected by a small mass of chew¬ 
ed bark which covers the burrows. Early in the spring the larvae 
leave the burrows and eat into the buds and new shoots causing them to 
wilt and die. The same larva may eat into several twigs, thus a few 
can do serious damage, especially to small trees. See Figs. 14 and 15. 
Many of the second brood larvae eat into the peaches, causing a 
gummy exudation and ruining them for the market. This is probably 
the worst insect pest of the peach in Colorado at the present time. 
Remedies. —Lime and sulphur mixture (16-17) has been most 
generally used in this State. Spray just before the buds begin to open. 
At this time the larvae begin to leave their winter quarters and are most 
