10 
under the auspices of the Territorial board of agriculture, has been extraordinarily successful. 
This species, Opius humilis, on the authority of Dr. Back, has already caused a considerable 
decrease in fly abundance in Honolulu, and particularly in the Kona coffee district on the island 
of Hawaii. The parasitism among larve developing in coffee berries is sometimes nearly com- 
plete, the records often ranging about 80 per cent. The parasitism of the larve of the fruit fly 
in other host fruits varies from 0 to 100 per cent, and involves a very considerable list of host 
fruits. This is, therefore, another apparently very successful parasite introduction in Hawaii, 
where so many previous successes have already been recorded. 
Mr. J. R. Horton, in charge of the Louisiana citrus work, made a visit of two weeks to Wash- 
ington and worked up reports and matured plans for the continuation of work at his station. 
Mr. E. W. Rust, assistant in the inspection work of the Federal Horticultural Board, is now 
in California on leave for the purpose of taking a civil-service examination. 
Mr. E. R. Sasscer, of the same service, is about to become the possessor of a sterilizer made 
for can sterilization for use in canneries, which is being provided by the Federal Horticultural 
Board for fumigation in partial vacuum of much larger quantities of material than has hitherto 
been possible. The first test with this apparatus will be the fumigation of an entire bale of 
Egyptian cotton to determine the depth of destructive penetration of the gas in relation to the 
pink boll worm. The Department of Agriculture will probably shortly issue orders and regula- 
tions governing the entry and utilization of foreign lint cottons to protect the United States from 
the pink boll worm, which is very apt to enter with the seed which is left in such cotton on 
account of faulty ginning. 
TRUCK CROP AND STORED PRODUCT INSECT INVESTIGATIONS. 
F. H. Currrenpen, In charge. 
Mr. F. A. Johnston, entomological assistant, has closed his office at Riverhead, N. Y., and 
will take up work on truck-crop insects, especially the pea aphis and root maggots, at Hart, © 
Mich. 
Mr. H. O. Marsh, scientific assistant, has returned after a short trip to Arizona, to his 
regular headquarters at Rocky Ford, Colo., where he will resume work on sugar beet and truck 
crop insects. 
Mr. Frank R. Cole has been appointed scientific assistant, to work temporarily at Pasadena, 
Cal., and vicinity. 
Mr. F. M. Wadley, of Manhattan, Kans., will return to Garden City, Kans., where he will 
assist Mr. F. B. Milliken in work on sugar beet and truck crop insects. 
Mr. C. E. Smith has been engaged to assist Mr. Thomas H. Jones in work on truck crop 
insects at Baton Rouge, La., and vicinity. : 
Mr. Neale F. Howard, a graduate of the agricultural college, University of Wisconsin, will 
work with this branch of the bureau on the pea aphis, root maggots, and other insects affecting 
truck crops, with headquarters at Green Bay, Wis., in cooperation with the University of 
Wisconsin. 
Mr. C. H. Popenoe has recently returned from Texas, where the new self-propelled onion 
sprayer was being tested. It was found that the operation of the machine in onion fields was 
quite successful and certain slight modifications as to tire width, etc., will render the machine 
somewhat more effective. This machine will also be tested by Mr. M. M. High against the 
melon aphis at Mission, Tex., since it is believed that through the pressure obtainable in a 
machine of this character the aphis may be readily controlled. The machine has proven to be 
applicable to the control of many truck-crop pests other than those on the onion. 
WASHINGTON : GOVERNMENT PRINTING OFFICE : 1915 
