Apr.-Sept., 1915 Illustrations IX 



Seedung Diseases ok Sugar Beets and Their Rei^ation to Root-Rot 

 AND Crown-Rot 



Page 

 Plate XVI. Isolation cultures from sugar-beet seedlings: Fig. i. — Rhizoctonia 



sp. Fig. 2. — Pythiurn debaryanum 168 



Plate XVII. Phoma betae: Fig. i. — Isolation culture from sugar-beet seedling. 



Fig. 2. — Fruiting culture on string-bean agar 168 



Plate XVIII. Fig. i. — Half-grown sugar beets showing crown-rot caused by 

 Phoma betae. Fig. 2. — Sugar beet showing seedling injury caused by 

 Phoma betae 168 



Plate XIX. Mother beet showing storage decay caused by Phoma betae 168 



Plate XX. Rhizoctonia sp.: Root-rot of sugar beet. Fig. i. — Result of 

 artificial inoculation, control beet in center. Fig. 2. — Result of natural 

 field infection 168 



Plate XXI. Fig. i. — Sugar beet showing field-rot caused by Rhizoctonia sp. 

 Fig. 2. — Sugar beet showing artificial infection with Rhizoctonia sp. on the 

 petiole 168 



Plate XXII. Results of artificial inoculation with Rhizoctonia sp.: Fig. i. — 

 Sugar beet, photographed from above, showing original crown destroyed, 

 and new leaves developing from the sides. Fig. 2. — Section of sugar beet 

 showing character of Rhizoctonia injury 168 



Plate XXIII. Fig. i. — Sugar beet showing large sclerotium (one-half inch) 

 resulting from artificial inoculation with Rhizoctonia. Fig. 2. — Half- 

 grown sugar beet showing injury to feeding roots due to an undescribed 

 parasite 168 



Plate XXIV. Fig. i. — Sugar beet showing damping-off due to an undescribed 

 parasite; control pot at right. Fig. 2. — Radish showing black-root caused 

 by the same fungus 168 



Plate XXV. Fig. i. — Field in which Rhizopus rot developed. Fig. 2. — 



Typical beets from the field shown in figure i 168 



Plate XXVI. Sugar beet showing alkali injury 168 



Phoma Betae on the Leaves of the Sugar Beet 



Plate XXVII. An old leaf of a sugar-beet plant showing typical spots of 



Phoma betae 178 



Relation Between Puccini a Graminis and Plants Highly 

 Resistant to Its Attack 



Plate XXVIII. Fig. i. — Oats inoculated with Puccinia graminis from Dactylis 

 glomeraia after three generations on oats. Fig. 2. — Same as figure i, seven 

 days after inoculation. Fig. 3. — Oats inoculated with P. graminis hordei, 

 four da^^s after inoculation. Fig. 4. — Same as figure 3 . Infection thread 

 growing over cell and destroying chloroplasts. Fig. 5. — Oats inoculated 

 with P. graminis triiici fotu: days after inoculation. Fig. 6. — Oats inocu- 

 lated with P. graminis triiici, 48 hours after inoculation 200 



Antagonism Between Anions as Affecting Barley Yields on a 

 Clay-Adobe Soil 



Plate XXIX. Barley plants showing growth as affected by various salts in 

 clay-adobe soil: Fig. i. — A, B, Gro^vth with 0.2 per cent of sodium chlorid 

 alone. C, D, Growth with 0.2 per cent of sodium chlorid and 0.2 per cent 

 of sodium carbonate. E, Growth v/ith 0.2 per cent of sodium carbonate 

 alone. Fig. 2. — A, B, Growth with 0.2 per cent of sodium chlorid alone. 

 C, D, Growth with 0.2 per cent of sodium chlorid and 0.5 per cent of sodium 

 sulphate. E, F, Growth with 0.2 per cent of sodium sulphate alone. ... 218 



