138 POULTRY DISi;ASI-.S and THEIR TRf.ATMENT. 



Stages the disease does not appear to disturb the general health 

 of the fowl. As it progresses the Ijirds become lame and some- 

 times the foot becomes so badly diseased that joints or even 

 x\'lir,le toes dr..,. off. Tlie photograph of a badly affected leg 

 is shnwn in iig.' 30. The two legs are usually aff'ected equally. 



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Fig. 31. Photograph nf tlic adult tcinali; of the mite Kiianidocoptcs 

 { llcnnatoryclcs) iiiutaiis. (After Haiduk). 



Etiology. — The disease is caused by the minute parasitic mite 

 kiiciiiiifocoplcs iiiiitaiis (figs. 31 and 32). 



