Stewart's disease of sweet corn (maize). 



123 



The variations in the plot were not great, as may be seen from selected portions (table 12). 

 Table 12. Showing that Kind of Soil Makes no Difference when Seed is not Infected. 



Crosby's Early. 



Healthy stalks, 2,171; diseased stalks, 437. 

 Total, 2,608; diseased, 17 per cent. 



Arranged in three groups according to amount of soil-moisture and vigor of the plants, the same 

 results follow as in the case of the Cosmopolitan : 



Table 13. Showing that Moist Soil is Favorable to Development of the Disease when the 



Organism is Present. 



Kind of ground. 



(1) Middle of field (east and west) on hill-slope 



(2) West side, moist end 



(3) North side, near west end, i. e., in lowest, moistest 



part of the field 



Healthy 

 stalks. 



','45 

 456 



570 



Diseased 



stalks. 



165 



76 



196 



Total. 



1,310 

 532 



766 



Per cent, 

 diseased. 



12.6 

 '4-3 



25.6 



This corn was larger than any other variety except the south two rows of Old Colony. 



Potter's Excelsior. 



Healthy stalks, 2,227; diseased stalks, 44. 

 Total, 2,271; diseased, 2 per cent. 



Arranged in groups according to soil-moisture and size of plants, the above count gave prac- 

 tically the same results as the Country Gentleman : 



Table 14. Showing that Moist Soil has no Injurious Influence in Absence of the Parasite. 



SUMMARY. 



The above facts may be summarized as follows : 



Table 15. Per cent of Cases by Varieties and Soil. 



