512 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



liine-suli)hiir wash. As a result of the department's work on peach 

 spraying for these troubles, the practice is now followed by a very 

 lariro number of peach growers. A total of probably 4,500,000 to 

 5,000,000 trees was sprayed with this mixture during 1910. 



Beginning with the spring of 1911 the demonstration work was 

 continued, but located in certain Middle xVtlantic and Northern 

 States, as representing distinctly different climatic conditions. Work 

 is in pro{;;ress in Delaware, West Virginia, and Michigan; and, in 

 addition to work on the peach, plums and cherries are also being 

 treated. In connection with the one-spray and demonstration spray- 

 ing of the apple against the codling moth, results are also being ob- 

 tained as to the effect of these treatments on the plum curculio. 



A thoroughgoing life-history investigation of the curculio was 

 begun in 1905 in conjunction with other work at several of the 

 bureau's field laboratories and in the insectary in Washington. A 

 large amount of information has now been accumulated on the 

 growth and development of the insect in widely separated localities, 

 as in western New York, in Michigan, in the environs of Washing- 

 ton, D. C., in Georgia, and in Arkansas. These studies sufficiently 

 cover its range of distribution and indicate important variations in 

 its habits and behavior. A full report embodying the results of these 

 investigations has been prepared and submitted for publication. 



MISCELLANEOUS APPLE INSECT INVESTIGATIONS. 



For some time it has been desired to begin a study of certain im- 

 portant apple pests which, though of less economic importance than 

 the codling moth and San Jose scale, are nevertheless very trouble- 

 some, and each year cost apple growers a large amount in loss of 

 trees, labor, etc. 



Apple-tree borers. — Principally two species of coleopterous borers 

 infest the apple. An investigation of the life and habits of these 

 insects was begun in the spring of 1911, and attention will be given 

 to determining, if possible, economic methods for the protection of 

 trees from their ravages. 



Woolly apple aphis. — An investigation of this serious pest has 

 also been started and will include an inquiry into its life and habits 

 and the use of remedies for preventing or lessening injuries in or- 

 chards and nurseries. 



The fruit-tree leaf-roller. — Much complaint of ravages by this 

 insect (Archips argyrospila) is received every year from the South- 

 west, notably New Mexico and central Kansas. In connection with 

 other work in the Southwest, a life-history study of this leaf -roller 

 is in progress, and experimental work for its control is being carried 

 out in New Mexico. 



MISCELLANEOUS GBAPE INSECTS. 



Several important insect enemies of the grape were given attention 

 during the season of 1910, the work being located at North East, Pa. 

 These were the rose-chafer, the grape leafhopper, and the grape 

 berry moth. 



The rose-chafer has continued quite troublesome in vineyards, es- 

 pecially in regions where sandy soils predominate. Investigations 

 of this insect are being continued the present season, and further data 



