I^X I'dfl.TKV niSIvASES ANM) TIll'lK TRKATMENT. 



Stages the disease does not appear to disturb the general health 

 of the fowl. As it progresses the l)irds become lame and some- 

 times the loot becomes so badly diseased that joints or even 

 whole toes drop ofif. The photogra])!) of a badly affected leg 

 is shown in fig. 30. The two legs are usually affected equally. 





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t ^ 

 I , 





y 



Xfi.'vjf- 



w 



Fig. 31. Photograph of the adult female of the mite Knemidocoptcs 

 (Derundoryclcs ) iinilaiis. (After Haiduk). 



Etiology. — The disease is caused !)>• the minute parasitic mite 

 Knemidocoptcs vutians ffigs. 31 and 32). 



