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. 
1 
Not can- 1 Can- 
kered, kered. 
Not can- 
kered. 
Can- 
kered. 
Plat G-1 
Plat I-l 
1,088 
2,470 
143 
137 
1 
536 ; 125 
479 ! 11 
191 
404 
119 
34 
Total 
Cankered plants per cent. . 
, .. ^ - 1 
3, .%4 
280 
7 
1,015 
130 
12 
595 
153 
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 a'nd cankered when grown without and 
with nurse crops, spacing and rate of seeding the same, at Fargo, N. Dak., in 1920. 
Plat. 
Number of plants in plat. 
Without nurse ' With nurse 
crop. crop. 
s 
Not can- 
kered. 
Can- 
kered, 
Not can- 
kered. 
Can- 
kered. 
Plat G-2 
1,088 
1,611 
143 
121 
1,084 
1,600 
86 
Plat 1-2 
3 
.. . . .percent.. 
Total 
Cankered plants.... 
2,699 
204 2,084 89 
9 ' 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. 
