38 A FEW INSECT ENEMIES OF THE ORCHARD. 
Its presence in the summer time is best noticed by the pale, 
sickly appearance of the foliage of the trees, by the whitish, 
scurvy appearance on the under side of the limbs and about the 
small crotches of the trees, and by the minute spider-like objects, 
of a dark color running about upon the bark. On examination, 
it will be seen that the scurvy appearance of the limbs is due to 
the cast skins and empty egg shells of the mites. 
Although the injury to the trees is chiefly manifested in the 
bleached foliage, the mites will seldom be found on the leaves. 
REMEDIES. 
The following are the results of experiments for the destruc- 
tion of both eggs and mites that were conducted by myself one 
year ago. During the fall, the mites deposit enormous numbers 
of reddish eggs upon the limbs of the trees, chiefly about the 
crotches. The eggs are massed together, and are plainly seen 
as reddish or rusty patches upon the bark : 
A number of small limbs of a pear tree that were almost 
covered with eggs were procured from Canon City and set out in 
moist earth for the experiments. Some of these I took while in 
Canon City, and others were sent me by Judge W. B. Felton: 
Whale-Oil Soap, in the proportions of one pound to a gallon 
of water, and in one-half and one-fourth this strength, killed per- 
fectly all the eggs that were treated with it, but in the propor- 
tion of one pound to eight gallons it did little good. The newly 
hatched mites were killed by whale-oil soap in all strengths 
down to one pound to eight gallons. 
Kerosene Emulsion, used without diluting (in which the kero- 
sene was two-thirds of the mixture) and diluted with water to 
one-half and one-fourth this strength, killed perfectly in every 
case. When diluted so that the kerosene was one-sixteenth of 
the mixture (or one-half of the last named strength) a very few 
of the mites hatched. This last strength did kill, perfectly, mites 
in all stages when thoroughly treated with it. 
Leggetfs Potash Lge, in the proportion of one pound to one 
gallon of water, did very little good in preventing the hatching 
of the eggs. As near as I could ‘estimate, it killed one-third of 
the eggs. 
Tobacco Decoction, mad(‘ by steeping one pound of tobacco 
in three gallons of water, had no perceptible effect upon the eggs, 
all hatching perfectly. 
Sulphur Spray, i)repared by combining three pounds of sul- 
])hur and two ])Ounds of caustic soda and diluting to 200 gal- 
lons in water, was also used against the eggs, but without effect. 
