2§2 THE FARM DOCTOR, 



TICKS. IXODES. 



These are common on stock in some parts of the country, 

 and may be picked off or dressings appHed as for acari. 



LARVA OF GADFLY. WARBLES. 



These may be found in little rounded tumours the size of 

 hazel-nuts, on the backs of cattle in winter and spring, each 

 tumour having a hole in the centre through which the grub may 

 be seen or extracted. A second species attacks sheep as well 

 as cattle, while a number of others in different countries, but 

 especially in the tropics, live in the skin of man and a variety 

 of animals. Where gadflies abound, animals are greatly 



fig- 53.— CEstrus Bovis. 



Gadfly of Ox. -Clakk. Fig. 54.— Larva of same. Warble. 



terrified and injured by their attacks. The best treatment is to 

 examine all cattle in spring and squeeze out and destroy the 

 grubs found in their backs, enlarging the openings with a knife 

 when necessary. This cuts off the supply of flies for the com- 

 ing year, and a universal practice of this might be expected to 

 kill them out. 



ATTACKS OF FLIES (DIPTERA). MAGGOTS. 



The attacks of flies are often very troublesome and even fatal 

 to stock. Many agents, such as oil, infusions of walnut leaves, 

 rue, or wormwood, are used to drive them off, but with only 

 partial success. To protect the heads of sheep a mixture of 

 camphor, turpentine, and asafoetida is very effectual. 



