“standard described on page 2. With such data covering the entire 5-year period for 
6 of the 8 rots and representing the natural fluctuation in prevalence of each rot 
from year to year under varied environmental conditions, the relationship of ear 
coverage to infection should be indicated rather accurately by the summaries pre- 
sented in the following tables, 
The relation of Fusarium infection to husk coverage is shown in Table 9, 
More diseased open than diseased closed ears were found in each of the 5 years, there 
Table 9.-=- Relation of Fusarium rotted ears to husk coverage, 
1931-1935, 
2 CE ema TI: 
Number of rotted ears|Percent of rotted ears} open, in 
Year Open { Covered Open | Covered | percent 
1931 2,622 seu 76.0 24,0 52.40 
1932 25479 832 75.0 250 50,0 
1933 Bygele 916 71.5 28,7 42.6 
1934 6,416 4,595 58,6 41.7 16,6 
1935 Peeoe it |) bg ede 63.1 5669 2602 
Average 68.8 ! Slee 5756 
being 1.4 times as many infected ears in the open class as in the closed in 1934 and 
about 3 times as many in 1931 and 1932, Over the 5Seyear period, open ears averaged 
68.8 percent and closed ears 31,2 percent of those infected by Fusarium, and for the 
entire period it appears significant that the preponderance of open infected over 
covered infected ears averaged 37.6 percent. 
The relation of Penicillium rot to husk coverage is shown in Table 10, 
While there was some variation from year to year in the relative abundance of open 
and covered diseased ears, in each of the 5 years there were fewer diseased ears in 
the covered group than in the open group. The average for the 5 years shows annually 
[10] 
