Table 10O.=. Relation of Penicillium rotted ears to husk 
coverage, 1931-1935, 
Excess of 
Number of rotted ears|Percent of rotted ears] open, in 
Year Open | Covered Open | Covered percent 
1931 682 413 6229 Otel 24.6 
1932 327 142 BUST 30.35 39.4 
1933 286 166 63.38 36.7 26.6 
1934 $11 243 56.1 43.9 12.2 
1935 ra a | 57.8 42.2 15.6 
ON. ae ie __ $1.8 58.2 2566 
61-8 percent of the infected ears in the open class and only 38.2 percent in the 
closed class, or an average excess of open over covered infected ears of 23.6 per- 
cente 
Competent data on the occurrence of Rhizopus rot in relation to husk cover- 
age were not taken in 1931, but this relationship, as shown by the data taken in the 
4 following years, is indicated by the summary given in Table ll. While there is in 
this, as in the ear rot previously discussed, an apparent tendency for a greater pre- 
Table ll.-- Relation of Rhizopus ear rot to husk coverage, 
1931-1935. 
naan ee eee 
eet 2 ae ee a es eee 
Excess of 
Number of rotted ears}|Percent of rotted ears} open, in 
Year Open | Covered Open | Covered percent 
1932 105 59 64,0 36.0 28.0 
1933 215 167 56.9 43.7 12.6 
1934 509 4.20 54.8 4562 9.6 
1935 67 87 . 43.9 ___ 96.5 - 13.0 
Average 54.6 y 45.4 9.2 
valence of infection, averaging 9.2 percent annually for the data given, to occur 
on open ears, the occurrence of a mich greater quantity of infection in closed ears 
in 1935 suggests the existence of other factors predisposing to infection that may, 
[11] 
