'8 BULLETIN 1120, U. S, DEPARTMENT OF AGRICULTURE. 



Only traces of canker were observed in the other two plats. Table 

 4 shows the number of cankered plants occurring in rows sown at 

 3, 1.5, and 0.75 grams of seed per rod, with the rows spaced 10, 12, 

 and 20 inches apart, respectively. 



Table 4. — Number of flax plants not cankered and cankered when grown in rows sown at 

 three different rates and spaced differently at Fargo, N. Dak., in 1920. 





Number of plants in rod rows. 



Plat. 



Sown 10 inches 

 apart, 3 grams 

 per row. 



Sown 12 inches 

 apart, 1.5 grams 

 per row. 



Sown 20 inches 

 apart, 0.75 gram 

 per row. 





Not can- 

 kered. 



Can- 

 kered. 



Not can- 

 kered. 



Can- 

 kered. 



Not can- 

 kered. 



Can- 

 kered. 



Plat G-1 



1,088 

 2,476 



143 

 137 



536 



479 



125 

 11 



191 

 404 



119 



PlatI-1 



34 







Total 



3,564 



280 



7 



1,015 



136 

 12 



595 



153 



Cankered plants per cent. 



20 













These data show that flax sown thinly cankered more than that 

 which was sown thickly. This agrees with the results obtained in- 

 1919, summarized in Table 3. 



Table 5 presents data obtained in 1920 showing the influence of a 

 nurse crop on the occurrence of flax canker. Barley was used as the 

 nurse crop, and the flax was sown at the same rate as in the experi- 

 ments without the nurse crop. 



Table 5. — Number of flax plants not cankered and cankered when grown without and 

 with nurse crops, spacing and rate of seeding the same, at Fargo, N. Dak., in 1920. 





Number of plants in plat. 



Plat. 



Without nurse 

 crop. 



With nurse 

 crop. 





Not can- 

 kered. 



Can- 

 kered. 



Not can- 

 kered. 



Can- 

 kered. 



Plat G-2 



1,088 

 1,611 



143 



1.084 



86 



Plat 1-2 



121 1.600 



3 











Total . 



2,699 



264 

 9 



2,684 



89 



Cankered plants , , , . -Jier nenl:, . 



3 











These data show that less canker injury occurs to flax plants 

 when partially shaded by a nurse crop than when sown at the same 

 rate without such protection. 



The data presented in Table 6 show the effect of shading the 

 young flax plants by 10-inch vertical strips of canvas used in the 

 same manner as in 1919, the data for which were presented in Table 3. 



