Dec. IS, 1919 



Cotton Rootrot Spots 



309 



again. On plot A6-3 (fig. 6), cotton has been grown each summer 

 since 191 2, the land being plowed in the fall, after the cotton stalks are 

 removed, and allowed to lie fallow during the winter. The plot B5-3 



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Fig. 6. — Diagram of plot A6-3, showing the portions of the rows in which the cotton plants were killed 

 each year by rootrot in 1916. 1917, and 1918. 







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Fig. 7. — Diagram of plot.Bs-3, showing the portions of the rows in which the cotton plants were killed 

 each year by rootrot in 1916, 191 7, and 1918. 



(fig. 7) receives the same cultural treatment as A6-3; and B5-4 receives 

 the same treatment, except that manure is applied in the fall each year 

 at the rate of 6 tons per acre. The diagrams of the occurrence of rootrot 



