6 The Colorado Experiment Station. 
the fall, where it may trouble the house-wife. During the 
present season they have been found on apple, plum, prune, 
cherry, pear, peach and almond in abundance. Probably less were 
seen on peach than any other of these trees. Only in one section 
were they observed to be of any serious consequence on peach. So 
common are they on all other kinds of trees mentioned that it would 
hardly be safe to say that they are more liable to attack one than 
another. An infested apricot, or quince tree has not been observed. 
Re 7 nedies 
The following experiments were conducted the past summer 
to determine which of the insecticides used would best control this 
pest, the applications being made as a spray, except No. 6: 
May 4 and 5, Experiment No. 1.—Sulphate of nicotine, 8 
ounces to 50 gallons of water. 
May 4 and 5, Experiment No. 2.—Nico-Fume, 9 ounces to 50 
gallons of water. 
May 4 and 5, Experiment No. 3.—Nico-Fume, ounces to 
50 gallons of water. 
May 4 and 5, Experiment No. 4.—Black-leaf, 1 part to 70 
parts of water. 
June 4, Experiment No. 5.—Flowers of sulfur, 1 pound to 3 
gallons of water. 
June 4, Experiment No. 6.—Flowers of sulfur as a dust spray. 
July 23, Experiment No. 7.—Flowers of sulfur, 65 pounds to 
200 gallons of water, and 2 pounds of whale oil soap. 
July 27, Experiment No. 8.—Same spray used as in No. 7. 
Experiments 1 to 6 inclusive, were conducted by myself. No. 
7 was conducted as recommended by me, and No. 8 under my su¬ 
pervision. 
Nos. 1 to 6 were in the orchard of Mr. W. E. Obert at Delta, 
No. 7 in the orchard of Mr. McCarry at Grand Junction, and No. 
8 in the orchard of Mr. 0 , D. Gehman at Grand Junction. Thanks 
are due these gentlemen for their assistance in the work. 
The Sulphate of Nicotine and Nico-Fume are tobacco prepara¬ 
tions manufactured by the Kentucky Tobacco Product Co., at 
Louisville. The Black-leaf is also a tobacco preparation manufac¬ 
tured by the,same company. All the tobacco sprays were found to 
be effective in killing the mites touched by them, but apparently 
had no effect upon the eggs. An examination of trees 24 hours 
after spraying showed that many of the adult mites had not been 
killed. It is next to impossible to do a thorough enough job with 
any spray which will only kill the mites, to sufficiently hold them 
in check so that they will not damage the trees, as they hide in 
cracks of the bark, under bud scales, and in so many other places 
where it is impossible to reach them. A later examination of the 
