April 1956 ARS-33-19 
United States Department of Agriculture 
Agricultural Research Service 
EFFECTIVENESS OF REPELLENTS AGAINST eee 
CULICINE MOSQUITOES 
By B. V. Teawisee! F. A. Morton.3/ and W. W. Yates4/ 
A large number of repellents were tested in the laboratory and field 
against several culicine mosquitoes from 1942 to 1946. The principal 
test species were Aedes taeniorhynchus (Wied.), sollicitans (Wlkr.), 
and a mixed population of Mansonia in Florida. A few tests were made 
against mountain Aedes and Culiseta in Oregon, Aedes (Aedes) sp. in 
New Guinea, and several arctic species in Canada and Alaska. Field 
tests were made against mosquitoes in general in a number of States. 
Most of the materials included in this report had been found to be out- 
standing in laboratory tests against Aedes aegypti (L.) (Morton et al. l, 
Travis et al. 3), but a few were tested only in the field. 
The p primary objective of these tests was to find chemicals or formu- 
lations that would protect troops from mosquito bites much longer than 
the standard repellents--dimethyl phthalate, ethyl hexanediol, Indalone, 
and a 6-2-2 mixture of these respective materials. Many of the prepara- 
tions were tested only a few times, and then dropped from consideration 
because they did not giye protection at least as long as the better standard 
materials. The more promising repellents were tested extensively. 
A manuscript covering this work was prepared in 1947 but could not 
be completed for publication at that time. Since then much additional 
work has been done on repellents for salt-marsh and subarctic Aedes, 
and reports on these tests have been published (Travis and Smith 4, 
Smith et al. 2). The previous work, however, contains considerable 
information that may be of interest to other workers, particularly the 
results with creams and other formulations. All the tests were made 
in Florida unless otherwise indicated. 
1/ This work was conducted at the Orlando, Fla., laboratory of the 
~’ former Bureau of Entomology and Plant Quarantine under funds allotted 
by the former Office of Scientific Research and Development and the 
Department of the Army. E. F. Knipling, J. H. Cochran, J. H. Robinson, 
and other members of the laboratory assisted in making the tests, and 
Lyda Robertsoninkeeping the records and assembling the data. This 
laboratory is now a part of the Entomology Research Branch. 
2/ Now with Cornell University. 
3/ Now with U. S. Army Engineers. 
4/ Retired. 
