


















for the control of the boll weevil is now under way. In April, three De 
-Havalind 4B planes were detailed by the Air Service for use in this work 
_ in cooperation with the War Department. These planes are under the command 
Of First Lieut. Guy L. McNeil, who served on this same project last season. 
Allen L. Morse, an aeronautical engineer from McCook Field, Dayton, Ohio, 
was also detailed for duty on this project and arrived at Tallulah shortly 
‘ after the arrival of the planes. It has been found that owing to the different 
_ behavior of the De Havalind planes, as compared with the small Curtis plane 
used in the experiments conducted last year, the dusting problem becomes quite 
different, and the mechanical problem of providing suitable distributing 
P mechanism is very complicated. Several types of dust hoppers have been con- 
_ structed for use in these planes. This phase of the work is still in an 
experimental stage and it will require considerable time and experimentation 
before a final design for a hopper can be decided upon. Mr. Coad, who is in 
_ charge of the Boll ‘Jeevil Laboratory, hopes to have a fairly satisfactory 
_ permanent hopper installed in at least one of the planes in time to use it in 
_ actual control work during the summer months, Several plantations near the 
landing field have been mapped and all arrangements made for poisoning the 
_ cotton on these in an effort to accomplish boll weevil control through the 
_ season. 
After spending several months in Baltimore, Dr. W. V. King has returned 
to Mound, La., and resumed active charge of the Malaria Mosquito Laboratory 
at that place. While in Baltimore Doctor King cooperated with Johns Hopkins 
University, working up a vast number of statistical data relating to notes 
on malaria mosquitoes collected at Mound. 
C. M. Smith, detailed from the Bureau of Chemistry to investigate the 
chemical and physical properties of calcium arsenate and the influence of 
various factors in the epplication of this insecticide to the cotton plant, 
has started on field work for the season at Tallulah, La. 
A. C. Morgan, in charge of the Tobacco Insect Laboratory at Clarksville, 
‘Jenn., addressed gatherings of Burley tobacco growers in Gallatin, Columbia, 
and Shelbyville, Tenn., May 31 to June 2, his subject being the control of 
tobacco insects. 

FRUIT INSECT INVESTIGATIONS 
A. L. Quaintance, Entomologist in Charge 
Fred. &. Brooks, of French Creek, W. Va., writes as follows: 
| 'The extensive injury done to chestnuts by weevils of the genus 
Balaninus is indicated by two notes received recently at this station, 
The notes are as follows: : 
tipr, %. G. Campbell, Acting Chief of the Bureau of Chemistry, 
states that between the years 1911 and 1916, inclusive, shipments of 

