APPLE TREE ENEMIES OF MAINE. 



O. A. JoHANNSEN, W. J. Morse, 



Edith M. Patch, C. E. Lewis. 



APPLE TREE INSECTS. 



Before it is possible to combat an insect pest intelligently we 

 must learn something of its habits and of its vulnerable points. 

 When these are known proper remedial measures may then be 

 taken for its extermination or repression. To meet the needs 

 of those who wish to learn something of the commoner injuri- 

 ous insects which affect the apple tree and its fruit this circular 

 has been prepared. It is a compilation largely from the Ento- 

 mological bulletins and circulars of the Maine Agricultural Ex- 

 periment Station. We desire to acknowledge the use also of 

 publications of the United States Department of Agriculture 

 and of other sources. 



There are very many different species of insects ranging in 



size from less than 1-50 of an inch to about 8 inches in length. 



From the United States alone over 30,000 species have been 



recorded of which over 400 are known to affect in greater or 



less degree the apple tree or its fruit. Though there are many 



that are, it must not be supposed that all insects are injurious 



for by far the larger number are either harmless or actually 



beneficial. Ruthless destruction of insects by means of trap 



lanterns and the like is to be deprecated since these methods 



are as apt to capture the beneficial and the harmless as the 



injurious. Poisons, traps, and other repressive measures must 



be used with caution, and at the right time and place in order 



to be most effective. 



Though technical terms will be avoided in this circular when 

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