Inse:cts and Inse:cticide:s 
47 
sprays against the scale insects and certain other insects that winter 
over in the egg stage on the trees. They are subject to the same 
criticism as all other oil sprays, that of being more or less injurious 
to trees under certain conditions. To lessen the danger of injury 
they should be applied only while the trees' are dry and the tempera¬ 
ture fairly high, at least several degrees above freezing. In their 
work in the Eastern states, they have found the danger of injury less 
if applied after the sap begins to flow, and just before the buds open. 
Onlv ‘‘soft” water should be used in any of the oil sprays, as' a very 
small amount of alkali will tend to break down the emulsion and give 
free oil. 
13. Gasoline: 
Gasoline is sometimes used as an insecticide. Its chief use is against 
bed-bugs. It is destructive to both the adults and eggs. It is applied 
pure by means of an oil can or hand atomizer. Keep all fire away 
until the building has been well aired. 
14. Turpentine 
Turpentine is used the same as gasoline, and the same precautions 
apply. It is more deadly to bed-bugs. 
15. Lime 
Lime, either wet or dry. is of very little value as an insecticide. It 
is sometimes used to dust trees that are infested with the cherry 
and pear slug, it causes the slugs to drop off and most of them perish. 
A.nv other fine dust will have the same effect. 
\\Titewash on trees destroys very few insects but oft^n prevents 
sun scalding. A good wash for this purpose is made in the following 
pro]'>ortions: 
I.ime (lump) . 
Tallow . 
Salt . 
Water to make it flow well 
The Government recommends the following formula: 
I.ime (unslackecl) . 40 pounds 
Salt . 15 pounds 
Rice flour . 3 pounds 
Snairsh whiting . ^ pound 
. 1 pound 
Water . 5 gallons 
Slack the lime and strain. Boil the rice and dissolve the salt and 
glue in warm water. Add the materials to the slaked lime in the 
following order stirring well all the time: salt, boiled rice, Spanish 
whitiup-. glue, and water. Let stand for a few days before using, then 
apply hot. 
.30 pounds 
4 pounds 
5 pounds 
