insecticide Sprays for Mosquito Control 
PURPOSE 
SPRAY lr: IDM eee _| PREPARATION 
LARVAE Space Residual 
spray spray 
EMULSION 
0.5-percent— 
Gamma » Coen | Vicari Dsteerpae ee | peepee 
isomer Mix | part of 20- 
of BHC percent emulsifi- 
(lindane). able concentrate 
Heptachlor. XSi | See ee eee ee with 39 parts of 
* 
Dieldrin. er | eee ee 5 |e ees ese water 
|-percent— 
DDIzeee= Xr | eee see le ee 
Chlordane_- Se | ore eae | eee te se 
Toxaphene.. 5c ian aes oh | Mix | part of 25- 
percent emulsifi- 
[2] See Ae acess eee | ee enece see able concentrate 
Methoxy- Saeed | emanates [eens Be with 24 parts of 
chlor water.” 
Eindane=294 |. See. x X 
Heptachlor.|_........ > Clipe | a seep arere 
2-percent— 
Chlordane. | __._...._._.- x x Mix | part of 25- 
percent emulsifi- 
able concentrate 
with 12 parts of 
water.* 
Malathion_. Xx KG iat ee Mix | part of 50- 
percent emulsifi- 
able concentrate 
with 24 parts of 
5-percent— water.* 
DD les |e X X Mix | part of 25. 
percent emulsifi- 
able concentrate 
SUSPENSION with 4 parts of 
|-percent— water.* 
Bindanezcsta reese oe | Sees Se X Mix | pound of 25- 
percent wettable 
powder with 2!/, 
gallons of water. 
2.5-percent— Mix | pound of 50- 
0) 0) Jessen] Recs aaa Pen eee X percent wettable 
Ghiordane 21 |tesnee: S128 ee x powder with 2!/2 
gallons of water. 
*To prepare an oil solution substitute fuel oil, diesel oil, or kerosene for 
water. Some oil solutions are available ready for use from insecticide 
dealers. 
Note: If you use a product containing a lower or higher percentage of 
insecticide, use proportionately more or less of it. 
Outdoors 
Residual sprays.—Few mosquitoes will live to enter 
your home if you apply an emulsion or oil solution of 
one of the following insecticides to places where mos- 
quitoes rest or hide about the home: 5-percent DDT, 
2-percent chlordane, or 1-percent lindane. 
These sprays are potent a week or more after they are 
applied to surfaces. When used in this way, they are 
known as residual or surface sprays. As long as they 
remain on the surfaces, they kill mosquitoes that come 
in contact with them. 
Apply residual sprays to the foundations and under- 
parts of buildings, around buildings, between logs, on 
tree trunks, and to the undersurfaces of leaves to a point 
where runoff occurs. Use a small power sprayer to treat 
large areas; use a compressed-air sprayer, or a knapsack, 
garden, or hand sprayer to treat small areas. Adjust the 
nozzle for a coarse spray. 
Do not spray an emulsion or oil solution on vegetation; 
it may burn the leaves. Instead, use one of the suspen- 
sions listed in the table above. 
Space Sprays.—There are times when you will want 
quick relief from mosquito attacks, especially during 
picnics, lawn parties, or other outdoor gatherings. You 
can control mosquitoes in these places by using one of 
the following sprays: a 1-percent lindane or 2-percent 
malathion emulsion or oil solution; pyrethrum or alle- 
thrin, which is available ready for use from insecticide 
dealers; or a 1-pound DDT-pyrethrum aerosol. A spray 
containing 5 percent of DDT may also be used. But dur- 
ing periods of mosquito migration near dusk, pyrethrum 
or allethrin is more effective. 
These sprays, which are used for temporary control, 
are known as space or contact sprays. 
Apply a space spray with a hand or power sprayer (or 
aerosol bomb). Aim the spray so that it will drift through 
the bushes, grass, and other vegetation. Repeat treat- 
ment every few hours, or as often as necessary. 
Indoors 
When you find mosquitoes inside your home, you can 
kill them with any good household spray. 
An aerosol bomb is highly effective and convenient to 
use. Release of the aerosol for a few seconds kills mos- 
quitoes in an average-size room. For best results, close 
windows and doors during spraying and keep them closed 
5 to 10 minutes afterwards. 
Sometimes it is necessary to apply a residual spray to 
mosquito resting places in the home. Apply a 5-percent 
DDT spray (an emulsion or oil solution) to dark and 
secluded spots—under chairs, tables, beds, and bookcases, 
in closets, behind pictures, and between furniture. The 
insecticide should remain effective several weeks to sev- 
eral months. 
REPELLENTS 
Repellents such as diethyltoluamide, ethyl hexanediol, 
dimethyl, phthalate, or dimethyl carbate give several 
hours of protection from mosquito bites when spread on 
exposed parts of the body and sprayed on clothing. The 
repellents are sold as single compounds and in various 
combinations and formulations, under different trade 
names. 
PRECAUTIONS 
Most insecticides are poisonous. Handle insecticides 
with care. Do not use them in concentrations greater 
than those recommended. If you spill an insecticide 
on your skin, wash immediately with soap and water. 
Launder clothes that become contaminated. Do not 
contaminate foods, dishes, or utensils. Store insecticides 
in plainly marked containers out of reach of children 
and animals. 
