‘in 1931, when no work was done in the northern third, all sections of the state were 
represented in each year's data. 
Table 7.-— Number of corn fields and ears exam- 
ined for specific ear rots, 1931-1955. 
Year Fields examined — ho _Ears € Bars _Ears examined 
1931 44 Ua 10,850 
19382 54 i 7,805 
1933 50 | 9200 
1934 71 13,660 
1935 Ree ye ____ 15,880 880 | 
Total 297 57, "57,595 
em em ee eee 
The diagnosis of specific rots was made in the field, for the most part; 
‘but, whenever the identity of a rot was questionable, a portion of the infected ear 
was saved for subsequent microscopic examination and identification. As a result, 
‘the actual number of ears affected with each rot, among all the ears examined, was 
recorded each year and indicates, on the basis of random sampling, the prevalence of 
each rot in each year. YThe recorded number of ears infected by each rot, when ex- 
pressed as a percentage of the total number of ears examined each year, constitutes 
an index by means of which, as is done in Table 8, the relative abundance of several 
Table 8.-- Field prevalence of 8 kinds of corn ear rot, 1931-1935. 
Se ee ee ee ene 
ee ee ne ee ee Ce ee ce eee eee 
Bones of ears rotted 
Type of rot Beets}, dese )1955 | ase. tf 1985 { Average 
Fusarium 24.0 42.4 34.6 Bre Bea 40.7 
Penicilliun iets 6228 4.9 4.1 bed 58 
Rhizopus 1.0 ie ik 4.2 6.8 1,0 360 
Smut non 1.5 ie 2ue 1.4 Lat 
Diplodia 5) Lead 206 1.4 04 Lee 
Gibberella 64 098 mules e135 94 ein 
Basisporium 458 «eo 036 - 80 » 76 006 
Aspergillus 20 204 020 2835 204 020 
