2976 REPoRT OF THE DEPARTMENT OF ENTOMOLOGY OF THR 
TREATMENT. 
Sources of infestation.—The insect breeds readily in dying and 
dead wood. Weakened trees, especially peach, plum and cherry, 
often harbor the beetles and if not removed may cause the infes- 
tation of neighboring trees. Small branches trimmed from the 
trees may become the sources of infestation. A case in point is 
the orchard of Globe peach trees near Youngstown, previously 
referred to. Without doubt this orchard became infested from a 
large pile of dead branches within about a rod of the corner tree 
in the northwest corner of the orchard. The beetles were breed- 
ing in the branches early in the season. During August about 
twenty trees in the corner of the orchard nearest the brush pile 
were found infested, the presence of the beetles being indicated 
by the exudation of sap. The worst infested trees were nearest 
the brush pile. | 
Suggestions for late summer and winter treatment.—The habits 
of the beetles, when attacking normal trees, suggest two methods 
of treatment: First, the liberal application, about the middle of ~ 
July, of some caustic wash, such as a solution of whale-oil soap, 
two pounds to the gallon of water, with the addition of crude 
carbolic acid, two ounces to the gallon of the soap solution. The 
whole should be well stirred before using, as otherwise the car- 
bolic acid and soap solution will not mix well. Probably two 
applications about ten days apart will be sufficient. The object 
of the applications at this time is to prevent the beetles from 
going into the bark. Second, severe winter pruning. ‘This is 
to destroy the eggs and hibernating larvee and beetles in the 
twigs. ‘The infested branches can be distinguished by the exuda- 
tion of sap as shown at Plate XXXVII, Fig. 3. The pruned 
branches should be burned. 
