Colorado’s Worst Insect Pests 
And Their Remedies 
BY CLARENCE P. GILLETTE. 
INTRODUCTION. 
It has been the object of the writer, in the preparation 
of the present bulletin, to put together, in condensed form, 
the largest possible amount of information that will be of 
practical value to the people of the state in combating in- 
sect pests. I have, therefore, avoided all technical expres- 
sions that might be annoying and meaningless to the gen- 
eral reader, and have only given the information that 
seemed to me necessary to enable one, who is not specially 
trained in entomology, to recognize the insect or its injury 
in each case and to know how to prepare and use the best 
remedies. There are a number of cases where the popular 
reader would say “worm,” where I have said ’‘larva,” or 
“caterpillar,” which are the more correct words; and I have 
used the words “clirysalis” for the resting stage 
of insects, but I take it that nearly all my readers know the 
meaning of these terms. 
I have not attempted to make the present pa[)er ex- 
haustive, as that would be im|)ossible in a bulletin of moder- 
erate size. I have only taken u]) those insects about which 
1 am most often asked questions and concerning which I 
think information is most needed 'by the people. 
It is hoped that all who are troubled with insect pests 
of any sort will feel free to make inquiries of the Kx])eri- 
ment Station as to best methods of destroying them or pre- 
venting their injuries. Whenever possible, st)ecimens of 
the insects or their work should accompany the inquiry. 
