t2 THE COLORADO EXPERIMENT STATION 
calyx end of pears were found filled with the wings and remains of 
male scale insects which had been entrapped and destroyed. Unpro¬ 
tected female insects were also found to have formed a portion of the 
spider s food, though those protected by scales were apparently unmo¬ 
lested. 
FIGI RM 2 
Lwice-s-tabbed lady-beetle, Chilocorus bivu'nerua, larva, pupa and adult 
natural size. After Bu eau of Entomology, Washington, D. C. 
Natural enemies, though very useful, do not usually succeed in 
reducing this pest to a degree making spraying unnecessary. 
REMEDIES. 
Experiments in Mesa County.— The first spraying aga’nst this 
insect in Mesa county, according to the statements of local fruit grow¬ 
ers, was about six years ago when the finding of “scaly” fruit called 
the attention of the growers to the necessity of steps toward control. 
The first material used seems to have been sprays of whale oil soap. 
These sprays, though expensive and inconvenient, proved fairly efficient 
in the hands of growers thorough in their methods and careful in pre¬ 
paring the mixture. At the time of the writer's first examination of 
pear orchards in the Grand Valley many were found which had been 
most successfully treated with the lime-sulfur-salt spray. Great va¬ 
riety of opinion existed regarding the method of preparation, the 
proper formulas and the best way and time in which to apply the spray. 
Sufficient difference of opinion existed to make spraying experiments 
advisable. 
Accordingly the pear orchard of Mr. Ray D. Garrison, east of 
Grand Junction, well suited to the experiment was selected and given 
treatment with the permission and co-operation of the owner. 
The orchard consisted of about 200 medium sized trees, of 
Bartlett, Clapp's Favorite, P. de Esta, Buerre de Anjou and 
Flemish Beauty varieties, the last being largely left untreated the pre¬ 
vious year and now thickly covered by the scale. The spraying was 
done April 3, 5 and 6, 1906, just before the opening of the fruit buds, 
and a thorough coating was given to all parts of the tree. Upon all 
plats spraying was done with the same degree of thoroughness. The 
insecticides used were variations of the lime and sulfur washes, kero¬ 
sene-lime emulsion prepared by combining kerosene with lime, and 
scalecide. 
Scalecide is an oil treated chemically so that it may be mixed with 
cold water without separation. It is a commercial product and is sim- 
