Insects and Insecticides. 
29 
20. LIME. 
Lime, either wet or dry, may be used freely upon foliage 
without fear of injury. It is of very little value as an insecticide. 
When freshly slaked and freely dusted upon the slugs that infest 
pear, cherry and plum trees it is said to be very effectual in 
destroying them. Experiments at this Station have not succeeded 
very well in killing slugs this way. As a coating upon the bodies 
of fruit trees it undoubtedly does much to prevent sun-scald late in 
winter and early in spring. The addition of a liberal amount of 
skim-milk or salt, or both, to the preparation will greatly increase 
its adhesive qualities. The following formula is printed in the 1899 
report of the Canada Experimental Farm : 
Skim-milk. 6 gallons 
Water.30 gallons 
Lime. 60 pounds 
Salt .10 pounds 
21. LIME, SALT AND SULFUR WASH. 
This wash, when properly made, is one of the most effectual 
applications for the destruction of scale insects and eggs of the 
brown mite, particularly in dry climates, like that of Colorado. It 
should be used only in the winter or spring, while the trees are 
dormant. The ingredients are used in the following proportions: 
Lump lime.30 pounds 
Sulfur.20 pounds 
Salt.15 pounds 
Water.60 gallons 
Put all together in a barrel or other receptacle and boil for four 
or five hours. If a wooden receptacle is used, steam boil. Strain 
through a coarse cloth to take out coarse lumps, and apply as a spray 
w T hile hot. 
22. RESIN SOAP (SUMMER WASH). 
A resin soap for summer use may be prepared in the following 
proportions: 
Resin..2 pounds 
Caustic soda.1 pound 
Tallow. 1 pound 
Dissolve the soda in one and one-half gallons of w r ater; then 
add the resin and tallow and dissolve them also by applying a 
moderate degree of heat, adding water enough to make three gal¬ 
lons. Before using, dilute one part of the soap with sixteen parts 
of water. 
Used for the same insects as are whale-oil soap and kerosene 
emulsion. 
