29 



Food Plants. 



The San Jose scale flourishes on a wide range ol food plants, and in 

 this fact we see another reason to fear the spread of the pest. \\ here 

 infested nurseries are located near woodlands, it is highly probable that 

 the latter Avill eventually become infested, and the eradication of the 

 insect in such a localitj- would be almost an impossibility. In this State 

 the San Jose scale has been found on the pear, apple, Pyrns myra, 

 Fyrus helerophijlla, j^lum, cherry, peach, apricot, nectarine, purple- 

 leafed prune, quince, Japanese quince, rose, currant, grape, American 

 elm, European elm, balm of Gilead, willow and catalpa. Elsewhere it 

 is known to attack spirea, maple, walnut, birch, etc. Dr. Howard's 



Fig. 3. Oyster-shell bark louse {MytUaspis pomorum) : a, female scale from below, show- 

 ing eggs; //, female scale from above, both figures greatly enlarged; c, female scales; 

 d, male scale, enlarged; (', male scales on twig, natural size. From Howard, Year 

 Book, U. S. Department of Agriculture, 1894. 



latest list of the food plants of this insect includes fifty-fiye species. 

 From this list it is evident that the insect is capable of adapting itself to 

 nearly all of our deciduous trees. 



Natural Enemies. 



Several parasites of microscopic projjortions have been reared from 

 the San Jose scale in the south and west, but, so far as the writer has 

 been able to learn, none have been recorded from this State Professor 

 Rolfs of the Florida Experiment Station has given much attention to a 

 fungous disease that has appeared in the colonies of the scale in the 

 south, and finds that it is of considerable assistance in checking the in- 

 crease of the insect. Samples of the fungus sent to Dr. J. B. Smith, 



