Some Insects Attacking the Peach. 9 
of the many Colorado orchardists who have used lime and sulfur for 
the control of this pest, and from the apparent success of this spray 
in California, we feel justified in recommending it for use in the 
sections of Colorado where there is injury from twig-borer. 
While arsenate of lead was a total disappointment in this sea¬ 
son’s tests, it has previously been used with good success and is, no 
doubt, effective when applied at the proper time. E. P. Taylor, in 
his annual report of the Western Slope Fruit Investigations for 
1906, gives some very satisfactory results from the use of 5 pounds 
of arsenate of lead to 50 gallons of water, applied on April 14, at 
which time the majority of the blossom buds showed their pink tips. 
Commenting upon the results of his experimental work, he wrote: 
“It may be said that arsenate of lead, applied in the spring at the 
time the buds of the peach are beginning to open, will control the 
peach twig-borer as effectively and cheaply as the lime and sulfur 
wash, up to this time the most universally used.” 
the peach tree-borer (Sanninoidea exitiosa) 
Colorado peach growers are fortunate in that they do not, as a 
rule, have the crown-borer of the peach to fight. In many of the 
peach-growing sections of the United States, this is one of the worst 
pests preying upon the trees. Unlike the twig-borer, which feeds 
upon the tender twigs and fruit, this species feeds just beneath the 
bark at the crown of trees, often girdling them. The adult insect is 
a moth which, at a glance, more closely resembles some kind of a 
bee or wasp, than a moth. The eggs of this moth are deposited on 
the trunks of peach trees, and the little worm-like larvae hatching 
from them, eat their way beneath the bark and there feed until full 
grown. 
The work of the insect may be detected by masses of gum in 
which are mixed pellets of wood or borings which the larva chews 
to pieces as it feeds. These gum masses usually occur at, or just be¬ 
low the ground line. Their presence aids in the fight against this 
pest, as the burrows in which the larvae feed can always be found 
beneath. By using the point of a knife or a piece of wire, this bur¬ 
row may be followed and the larva located and killed. No better 
method for combating the peach tree-borer has ever been devised 
than worming, as the above process is called, with a knife or some 
other implement that can be inserted into the burrow. Worming 
should be done both in the fall and spring. While the larvae often 
do not attain a sufficient size in the fall to be readily detected, a 
great many of them can be killed before they get in very far, thus 
preventing the damage that they might do before they could be de¬ 
tected in the spring. 
Various other methods of control have been tried, such as 
wrapping the trunks with tar paper to keep the moths from deposit- 
