=—iGte 
TROPICAL, SUBTROPICAL, AND ORNAMENTAL PLANT INSECT INVESTIGATIONS 
A. C. Baker, in Charge 
In company with Dr. C. L. Marlatt, Dr. A. C. Baker left Wash= 
ington, D. C., on April 9 to confer with officials of the Florida State 
Plant Board concerning the recent outbreak of the Mediterranean Fruit 
Fly. Dr. Baker is now giving special attention to investigations which 
are necessary in the program of eradication. 
On April 16, during the noon hour, E. A. McGregor spoke over 
K F I at Los Angeles on the subject "The Citrus Thrips and Its Control." 
This is probably the most powerful broadcasting station on the Pacific 
Coast, and the reception was clear at least as far as Lindsay. 
During the latter half of April The Western Dusters, a commercial 
company, have been cooperating with E. A. McGregor in applications of 
sulphur by airplane for the possible control of the citrus thrips. The 
preliminary calculations of the expected destruction of citrus thrips by 
this method seem to give considerable promise. 
CEREAL AND FORAGE INSECT INVESTIGATIONS 
W. H. Larrimer, in Charge 
Carl Heinrich, of the Taxonomic Unit, sailed from New Orleans 
on April 12 for Guatemala, to investigate reported occurrence of the 
European corn borer in that country, and to study related species of 
Pyrausta and their parasites. He will be absent about ten weeks. 
W. A. Baker, of the field laboratory at Monroe, Mich., spent 
April 8 to 10 at the headquarters for corn—borer research, at Arlington, 
Mass. 
Lowell A. Woodbury was appointed on April 2 as Field Assistant, 
for duty at the field laboratory at Salt Lake City. 
On April 19 Prof. Geo. A. Dean, of the Kansas Agricultural Ex- 
periment Station, while en route from California to Manhattan, Kans., 
stopped at Salt Lake City, Utah, to confer with Geo. I. Reeves, in charge 
of the field laboratory there. 
Professor Herbert Osborn, of the Ohio State University, spent 
Some time at the Washington office of this division during intervals 
of attendance at the sessions of the National Academy of Sciences, which 
were held April 22 to 24. 
