Table 2.-= Prevalence of open and covered ears in some corn 
varieties. 
iy aS a =) Ratio of 
Fields | Ears : Number of ears | open to cov-= 
Variety e©xame exam. ‘| Open |} Covered : ered ears 
' i 
Bloody el | 
Butcher 200 64 | 136 | i ab aah pS 
Calico 700 322 578 | Bice, (Eales 
Democrat 3 2,000 + 6764 | 1,236 | wt eG 
Krugg We: 20 a ge UL RI Saale ee ae 
ee re me ince. -snrenioe 
FIELD PREVALENCE OF CORI EAR ROT 
The presence of ear rot was determined in the field by pulling back the 
husks of each ear and examining it for the presence of fungus growth or sporulation, 
without removing the ear from the stalk. Ears that showed superficial characters of 
disease but no visible mold growth, as in Basisporium and some Diplodia infections, 
were broken to determine whether any mycelium, spores, or fungus fruiting bodies 
were present and were counted as roteinfected when these were found. Data were taken 
on this basis, which is designed to show the total field prevalence of ear rot regard- 
Table 3e-- Prevalence of ear rot in Illinois corn fields, 
1932-1935. 
‘ "umber of ears Percent of ears 
Fields | Ears | Not | Not 
Year exam. exam. ' Rotted ! rotted LF: _Rotted oc rotted _ 
1932 | 48 7,005 | 3,911 | 3,094 | 55.8 | 44,2 
1933 51 9,800: |} 45285: |) 551174. 4640 55.0 
1934 71 ie neO | 22,589. {- 2,501 90.5 9,5 
1935 78 15,880 | 4,462 ! 11,418 | 28.1 71.9 
Total | 248 | 45,645 '"~ ae tie 
Average _ 54.8 4502 
less of particular causes, only during the 4 years, 1932-1935. <A summary of them is 
: presented above in Table 3, 
at [4] 
