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occasions upon pear trees and which has in a few instances killed plum 
trees on the western slope. 
The brown mite, Bryobia pratensis, occurs in myriads in orchards 
in the western portion of the State. As early as May 20 of this year 
the foliage of many pear, apple, and plum trees was showing very dis- 
tinctly the bleaching effect of the attack of these mites. In the winter 
time there are portions of the trunk and limbs of the trees that are 
colored red with myriads of eggs that are to hatch the spring brood. 
The eggs are readily destroyed by strong applications of kerosene 
emulsion or by the lime, salt, and sulphur mixture, and the ordinary 
kerosene emulsion destroys the mites after they hatch. 
Some farm and garden pests are as abundant in Colorado asanywhere, 
and among these are the imported cabbage butterfly, Preris rape, 
the cabbage louse, Aphis brassice, the cabbage Plutella, P. crucifera- 
rum, the pea weevil, the squash bug, the onion thrips, and cutworms. 
In addition we have the bean beetle, very destructive to wax beans, 
and other enemies of less importance. 
The beet army worm, Laphygma flavomaculata, made a very inter- 
esting record for itself last year in localities in the State where sugar 
beets were grown. I can not find that the insect has ever been reported 
as an injurious species before. 
Specimens sent to Prof. J. B. Smith were named for me as above, 
and I afterwards found that there were specimens of the moth in the 
collection that had been taken at night at Denver and at Boulder. 
My attention was first called to the insect asa beet enemy by Mr. - 
C. E. Mitchell, with the Colorado Sugar Manufacturing Company, 
Grand Junction, Colo. Mr. Mitchell first wrote to another person, 
about the 20th of July (the letter never coming into my hands), stating 
that a worm had appeared in considerable numbers upon beets in por- 
tions of Grand Valley. On July 29 Mr. Mitchell wrote, saying: ‘‘The 
worms have disappeared almost entirely during the past week. They 
seem to have gone into the ground.” On the 12th of August a tele- 
gram was received from Mr. Mitchell stating that the worms had again 
appeared, and asking me to go at once to investigate the matter. 
This I did. The caterpillars were scattered to some extent over the 
entire area planted to beets, but the chief injuries were upon newly 
broken ground between Grand Junction and Palisades. Not less than 
200 acres of beets had their leaves badly stripped, and fully half this 
acreage was so badly eaten down that the crop was not worth harvest- 
ing. When the beet leaves were devoured, the caterpillars ate in just 
beneath the crown and then went down on the beet. In fields where 
the beet leaves were mostly eaten away, the caterpillars were crawling 
over the ground in all directions in search of food, and they seemed 
to be able to make use of almost any green thing for this purpose. 
Potatoes in some cases suffered badly, as did small fruit trees where 
