6 THE PLUM CURCULIO. 
attention to life-history studies of the curculio in western New York, 
as also the year following in northwestern Pennsylvania, in addition 
to numerous field experiments in spraying during these and subse- 
quent years. During 1908 Mr.S. W. Foster and the junior author car- 
ried out extensive life-history investigations and field experiments in 
northwestern Arkansas, and similar work was accomplished the same 
season in the environs of Washington, D.C., by Mr. P. R. Jones. Dur- 
ing 1909 work on the curculio was limited largely to experiments with 
sprays in orchards, made in conjunction with experiments against the 
codling moth, and carried out in Arkansas and Missouri by the junior 
author and Mr. F. W. Faurot, in Virginia by Messrs. J. F. Zimmer and 
KE. W. Scott, and in Michigan by Mr. R. W. Braucher. In 1910 impor- 
tant life-history observations were made in Michigan by Mr. A. G. 
Hammar, and many additional data on the curculio in the South were 
obtained during the same year by the junior author and Mr. E. W. 
Scott, with headquarters at Barnesville, Ga. In much of the orchard- 
spraying experiments on both peach and apple the work has been 
done in cooperation with Mr. W. M. Scott, of the Bureau of Plant 
Industry of this department. 
Several publications on the plum curculio have been issued during 
the course of the work. An article on this insect was published in 
the Yearbook of the department for 1905 in a paper entitled ‘‘The 
principal insect enemies of the peach.” Circular 73 of the Bureau of 
Entomology, on the plum curculio, by Messrs. Fred Johnson and 
A. A. Girault, was published in 1906; and the results of a comparison 
of the demonstration and one-spray methods in the control of the 
codling moth and plum curculio were published in November, 1910, as 
Part VII of Bulletin No. 80 of the Bureau of Entomology, a revised 
edition of which was issued March 30, 1911. Circular 120 of the 
Bureau of Entomology, entitled ‘Control of the Brown-rot and Plum 
Curculio on Peaches,” by W. M. Scott, of the Bureau of Plant Indus- 
try, and the senior author, was issued in March, 1910. This gave 
instructions for the preparation and use of a combined spray for the 
curculio and fungous diseases of the fruit of the peach. The results 
of further experiments in peach spraying for the curculio, brown-rot, 
and scab were given in Farmers’ Bulletin 440, by W. M. Scott and 
the senior author, published in March, 1911. 
In the present paper are brought together the more detailed 
results of the studies of this insect which have been in progress, 
including some of the data which have been already published. 
Especial attention has been given to presenting the data as far as 
possible in tabular form, with necessary discussion of the tables to 
bring out the more important points. 
A. L. QUAINTANCE, 
In Charge of Deciduous Fruit Insect Investigations. 
