164 Common Scab of Potatoes 



REFERENCES. 



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Smith, W. G. (1884). Text-book. Diseases of Field and Garden Crops. 



Thaxter, R. (1890). Ann. Report Conn. Agric. Exp. Stn. 80-95. 



Cunningham, G. C. (1912). Phytopathology, ii, 97. 



GiJssow, H. T. (1914). Ref. Phytopathology, ix, 327. 



LuTMAN and Cunningham (1914). Vermont Agr. Exp. Stn. Bui. 184, 42. 



Kbainsky, a. (1914). Centbl. Bakt. Abt. 2, Bd. xli, 649-688. 



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Drechsleb, C. (1919). Bot. Gazette, Lxvii, 65-83 and 147-1(>8. 



Massee, G. (1915). Text-book. Diseases of Cultivated Plants and Trees, 458. 



Lutman and Cunningham (1914). Vermont. Agr. Exp. Sta. Bui. 184, 24. 



McKiNNEY, H. H. (1919). Phytopathology, ix, 328. 



BoLLEY, H. L. (1890). Ref. Ann. Report Conn. Agric. Exp. Sta. 81 and 84. 



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EXPLANATION OF PLATES VIII AND IX 



Fig. 1. A typical example of the commonest form of Common Scab. Reproduced from 

 Report 118, Univ. of Leeds and Yorkshire Council for Agric. Educ. 



Fig. 2. "British Queen" potatoes — the produce of Pot 2 showing scabs in various stages 

 produced by inoculation with Actinomyces scabies, strain No. 2. 



Fig. 3. "Great Scot" potatoes from the produce of Pot 6 showing scab spots produced by 

 inoculation with Actinomyces scabies, strain No. 7. 



Fig. 4. "British Queen" potatoes, the produce of the uninoculated Pot No. 4 (Control). 



(Received March 9th, 1922.) 



