Jan. 21, 1918 Irrigation Experiments on Apple-Spot Diseases 137 



(17) Scott, W. M. 



191 1. A NEW FRUIT SPOT OP APPLE. In Phjrtopathology, v. i, no. i, p. 32-34. 



(18) AND Roberts, J. W. 



1913. THE JONATHAN FRUIT-SPOT. In U. S, Dept. Agr. Bur, Plant Indus. 

 Circ. 112, p. 11-16, 2 fig. 

 (19) SORAUER, Paul. 



1900. scHUTz DER OBSTBAUME gegEn krankheitEN. 238 p., iio fig. Stutt- 

 gart. 



(20) 



1909. handbuch DER pflanzenkrankheiten. Aufl. 3, Bd. I. Berlin. 



(21) White, Jean. 



1911. bitter pit in apples. In Proc. Roy. Soc. Victoria, n. s., v. 24, pt. i, 

 p. 1-19, 9 pi. 



(22) Wortmann, Julius. 



1892. UEBER die sogenannte "stippen" der aepfel. In Landw. Jahrb., 

 Bd. 21, p. 663-675. 



