14 the coeorado experiment station 
ciently strong. A preparation of 1-20 (5 per cent.) oil is usually 
successful if thoroughly applied and makes a spray of very mod¬ 
erate cost. Directions for the preparation of kerosene emulsion are 
given near the end of the bulletin. The trouble, if any, will be 
in obtaining a good emulsion from which the oil will not separate 
and collect upon the surface. To be successful use a moderately 
coarse and forceful spray. While we are inclined to consider a 
good kerosene emulsion the most efficient of all the insecticides we 
have used against the woolly aphis, we are aware that most 
orchardists have had so much trouble making it that they prefer to 
use something more easily prepared,, even at a somewhat in¬ 
creased expense. Such men as B. A. Smith, F. C. Jaquette, Joseph 
Cornetto, E. M. Cheedle, W. K. Haines, and others in the Grand 
Valley, have used the emulsion with the best of results. 
SCAEECIDE AND OTHER MISCIBEE OIES. 
There are upon the market a number of so-called miscible, or 
soluble, oils whiph, when put into water, break up into very fine 
particles and form a milky white emulsion. These, like kerosene 
emulsion, make a very good and efficient spray for lice if they 
do not separate to form a film of pure oil on top. The only prep¬ 
aration of this kind that we have used at all extensively is Scale- 
cide. When used as strong as 3 to 4 per cent, oil we have found it 
very effectual. Apparently the soluble oils have to be used with 
more care than kerosene emulsion on account of their liability to 
injure foliage when too strong. 
SOAPS. 
In our experiments for several years past some of the stand¬ 
ard whale-oil or tree soaps have given very satisfactory results, 
but, for some reason, the orchardists have not seemed to be as 
successful with the soaps they have used. We have used chiefly 
the brands sold as Good’s Whale-oil soap, and Bowker’s Tree- 
Soap, and I pound to 8 gallons of water has usually been suffi¬ 
ciently strong. The warmer these soaps can be when applied, the 
better. We believe the soaps can be purchased so as to be among 
the cheapest of spray materials, and if an3^one has been using a 
brand that has given him success, we see no reason why he 
should make a change. Mr. A. L. Roberts, of Paonia, reported to 
us last year that he completely cleaned the woolly and green ap¬ 
ple lice out of his orchard by thoroughly spraying with 13 pounds 
of whale-oil soap and i gallon of Black Leaf to each tank of 220 
gallons of water. 
^"beack EEAE.’" 
The Kentucky Tobacco Product Company, of Louisville, Ken¬ 
tucky, manufactures a tobacco extract which they sell under the 
