TREE HOPPERS AND THEIR CONTROL O 



lion. Nightshade placed in a rearing cage was so girdled that the 

 top of the stems died beyond the scar. 



The tree hoppers have been found to deposit eggs in the following 

 trees: Apple, pear, peach, willow, locust, and poplar. (Fig. 6.) 

 Cherry and prune trees appear to be nearly immune. In a num- 



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Figure 3. — Apple twig showing leaf clusters nearest the tip and a number of ovipo- 

 sition wounds of the dark-colored tree hopper in the live wood below the foliage. 

 Natural size 



ber of instances cherry and prune trees growing in the oldest of 

 seriously infested apple orchards in alfalfa cover crop showed no 

 oviposition scars. 



GENERAL DESCRIPTION OF TREE HOPPERS 



These insects are from 7 to 10 millimeters (one-fourth to three- 

 eighth inch) in length and from 3 to 6 millimeters in width, more 



