Circular 21 - Inseoticides and Subsidiary Materials 8 
aresk:et 
Aresket is useful as an emulsifier in 
place of soap in preparing certain spray emul- 
sions when it is necessary to use hard or sea 
water which would precipitate the soap. Like 
other similar wetting and spreading agents, 
it is useful for incorporation in pyrethrum 
sprays intended to kill mosquito larvae v/hen 
applied to pools, marshes, or other bodies of 
water having a salt content higher than 5 
percent. 
Aresket is a proprietary product known . 
chemically as the sodium monosulfonate of 
monobutyl diphenyl. It is a fine, tan-colored 
powder soluble in water and alcohol but not 
in acetone o It is available at most seed and 
insecticide stores at about 50 cents a pound. 
For manufacturers and distributors see 
number 76 of list at end of this circular. 
ASBESTOS 
Asbestos is not an insecticide but it 
is sometimes employed in the powdered form in 
combination with calcium chloride to make a 
paste for sealing large cracks and crevices 
in connection with insect control operations 
such as the fumigation of buildings. It is 
used also in connection with termite control 
operations for enclosing v;ater and heating 
pipes under buildings in place of wooden 
encasements, especially for pipes running 
vertically. In this way termites are 
prevented from reaching the superstructures. 
