16 COMMON WHITE GRUBS. 
as to their value when used in this manner, and the feasibility of 
their use for this purpose is still an open question. 
METHODS OF CONTROL. 
All general measures here discussed and recommended are pre- 
ventive rather than remedial, for once white grubs are present in a 
field of corn or other crop there is no means as yet known of pro- 
tecting that particular crop from its ravages. On the other hand, 
there are certain cultural and other practices which will greatly 
minimize the damage in succeeding years. 
Fic. 12.—Pasture sod overturned by swine in their search for white grubs, Lancaster, 
Wis., 1911. (Original.) 
UTILIZING HOGS AND POULTRY FOR DESTROYING THE GRUBS. 
An infested field may be thoroughly cleared of grubs by pasturing 
it with hogs, and this method should be followed wherever possible. 
Hogs are very fond of grubs and will root to a depth of a foot or 
more in search of them. (See fig. 12.) Such pasturing may be done 
at any time during the summer, but it should not be delayed later 
than the middle of October nor should it be practiced earlier in 
spring than April in the latitude of central Indiana or May in the 
latitude of Wisconsin, since at other times the grubs will probably 
be in their winter quarters, deep in the ground, and a large percentage 
may then escape the hogs. 
543 
