TREE HOPPERS AND THEIR CONTROL 5 



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

 tops 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, also in cherry, 

 plum, and quince. (Fig. 6.) Prune trees appear to be nearly 









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IP' .^ ■■;■ f ■.'"■'■- :i - 



• 



1 







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 



immune. In a number of instances cherry and prune trees growing 

 in the oldest of seriously infested apple orchards in alfalfa cover 

 crops showed no oviposition scars. 



GENERAL DESCRIPTION OF TREE HOPPERS 



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

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



