668 MANAGEMENT OF SHEEP INTERNAL PARASITES 



A few larvae do little harm, but if they are in great 

 numbers the constant irritation produces loss of condition 

 and emaciation. 



Treatment. Fumigate the nostrils with tobacco smoke 

 to dislodge the larvae. 



In badly-affected pastures two or three furrows may be 

 ploughed up, in which the sheep can bury their nostrils when 

 they fear attack, or their feeding troughs may be smeared 

 with tar, so that, while feeding, their noses become smeared, 

 and this prevents the flies settling to lay eggs. 



