8 The Colorado Experiment Station. 
egg mass examined on check trees in same row had from one to a 
great many mites crawling about over it. The foliage of sprayed 
trees recovered its normal green color, and remained so through¬ 
out the season, standing out in beautiful contrast to that of the un¬ 
treated trees, many of the leaves of which turned yellow early in 
ihe season. Not only was there a difference in the foliage, but the 
fruit also showed a marked difference, that from check trees being 
small and worthless, while that from treated trees matured well and 
was good. 
Experiment No. 7 showed just as conclusive results. The 300 
pear trees in this experiment began to pick up immediately after 
spraying, and an improvement in the fruit was soon apparent. The 
only trouble in this orchard was that the spraying was neglected 
until too late, as much damage had already been done. An exam¬ 
ination a few days after the spraying showed that treated trees 
were free from mites, while some plum trees in the orchard, which 
'were left untreated, still had many of the mites on the foliage. As 
the infestation of mites on the pear trees was serious, it is probable 
that the spray paid for itself, even though it was late before the 
applicaton was made. Spraying in this experiment was done with 
a gasoline power outfit. Previous to the time of spraying this 
orchard with sulphur, a Black-leaf spray was used with very little 
success. 
In experiment No. 8, twelve cherry and two plum trees were 
used. The mites were completely exterminated from these trees. 
One cherry tree was left as a check, and an examination of the 
trees ten days after spraying failed to reveal the presence of any 
mites on the treated trees, while on the one check there were still 
many of them. 
I feel that the results of these four experiments with sulphur 
sprays are conclusive, and that it is perfectly safe to recommend 
a spray of flowers of sulphur and water for brown mite. While 65 
pounds to 200 gallons of water were used in these experiments, it 
is probable that 50 pounds would be enough. A small amount of 
.soap must be used so that the sulphur will mix with the water. If 
soap is not used the sulphur will remain on the surface and no 
amount of agitation will mix it. Two pounds of soap to 200 gal¬ 
lons of water is plenty, and probably less will answer the purpose. 
Prof. Gillette has found that a soluble oil spray is more effec¬ 
tive in killing the eggs than are the tobacco sprays. In the case of 
the mites themselves this was reversed, and tobacco prepartions 
were the more effective. While soluble oil might be successfully 
used as a dormant spray, it is not a reliable remedy where water is 
strongly alkaline, and if such water is used a thorough mixture 
cannot be maintained with any of the different brands of soluble 
oil that the writer has tried to use. Because of this fact none of 
