WARBLE FLIES. 63 
Another method of removal 
is to force grease or oil into the 
openings of the tumors and 
thus kill the grubs. Recently it 
has been stated in Europe that 
the injection of one-half to one 
cubic centimeter (20 to 40 
drops) of tincture of iodine into 
the tumor will kill the grub. It 
has also been claimed that the 
use of repellants such as some Fic. 7. Method of squeezing out ‘‘grub.”’ 
Conrtesy of Country Gentleman. 
of the oily washes or sprays so 
often recommended to keep flies from cattle and horses, will pre- 
vent the flies from laying eggs on the animals. It is also thought 
that the use of arsenical dips as employed for tick destruction in 
the South will reduce the number of grubs. 
It is still open to question whether any remedy is so effective 
as that of squeezing out and crushing the grubs in spring. Where 
the herds are of such a size as to make it possible to give system- 
atic supervision and examinations to cattle, it is possible to reduce 
the flies to their minimum numbers if not to entirely exterminate 
them in one or two seasons. Success in a community, of course, 
involves team work on the part of everybody. 
Considering the losses which will follow its introduction into 
Minnesota, it will be well for everyone importing cattle to watch 
carefully for these warbles and see that they are exterminated 
on those animals, if they are found to be present. Their distribu- 
tion through the State will cause inestimable loss. 
