-137- 
For the control of mosquito larvae a standard dosage for many types of 
water is 1 to 2 imperial quarts per acre of a 5-percent (w/v) solution 
of DDT in an oil of good spreading power. It is often very difficult 
to put down so small a volume on an aore, even using a fine nozzle 
and low pressure on the sprayer: it may be preferable to double or 
treble the volume of oil, using the same amount of DDT.— Buxton ( 100) • 
DDT is a contact poison to Anopheles .- Domenjoz (135 ). 
The methoxy and the ethoxy analogs of DDT were found about equally 
effective against mosquito larvae (Culex guinquefasciatus ) ; concentra- 
tions of 0.03 to 0.04 p.p.m. in tap water killed half of the larvae in 
20 hours. The n-propoxy analog at 0.4 p.p.m. gave about a 50 percent 
kill while the n-butoxy analog at 4 p.p.ro. gave a negligible kill.— 
Prill _et al. (297 ) . 
Culex pipiens L., the northern house mosquito 
Same as for Aedes s o 1 1 i o i t ans . — N • J. Agr. Expt. Sta. (275 ) j 
Ginsburg ( 178 ). 
Culex salinarius Coq. 
Culex territans Walk, (s restuans Theob.) 
Sane as Aedes sollici tans .—Ginsburg (178 )» also N. J. Agr. Expt. 
Sta. (275) . 
Unidentified moBqultoes 
The abundance of unidentified mosquitoes was noticeably reduced in 
a number of plots sprayed with IDT.— Craighead and Brown (125 ) . 
Adult mosquitoes and houseflies were killed by applying a 5-peroent 
DDT solution in kerosene to walls, doors, and screens of buildings by 
means of power paint sprayers, hand spray guns, and paint brushes. The 
men wore protective masks. The insectioide did not give immediate re- 
sults but after several days medical officers were convinced of its 
effectiveness. Areas have to be resprayed about every month or 6 weeks. 
— Farr (149); Anon. (19). 
A joint statement of policy by the U. S. Army and the U. S. Publio 
Health Service, adopted March 31, 1945, called for the distribution of 
DDT from airoraft for large-scale area control of mosquitoes in mili- 
tary and adjacent areas in the United States to be limited to projects 
conducted with due regard to its possible effects on beneficial insects 
and all forms of plant and animal life, and in accordance with safeguards 
