73 
It would appear from table 7 that control of adults by spraying would 
not be generally effective for Phyllophaga rugosa , P. fusca , and P. futilis , 
which, have 10, 8, and 12 principal hosts, respectively. In the case of 
P, hirticula , _P. tristi s, and p, il&cis., better results might be obtained, 
because these species concentrate their feeding on fewer kinds of plants. 
The species of grubs most common in cereal and forage crops, however, have 
been P, rugosa , P. hirticula , and P. fusca. G-rubs of P. tristis and_P. 
futilis occasionally have been numerous in these' crops in some localities. 
P. ilicis grubs have not been found in the field. 
In considering the data in tables 6 and 7, it should be borne in mind 
that while these- da, ta show clearly the kinds of plants preferred by various 
species of June beetles for food, they are not an entirely accurate measure 
of the importance of the various plants as hosts in all localities. Por 
example, in large areas where P hyllophaga hirticula is numerous, the host 
plant bur oak is more abundant than is hazel, and individual plants furnish 
much more foliage to be fed upon than do individual hazel plants. In regard 
to cultivated cherry, which supplied many of the P. rugosa and P. fusca 
beetles collected, this plant can be important only in those limited areas 
in which it is grown commercially. 
