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Sweet Corn Disease Nursery

2001 Annual Report

Jerald Pataky, Phil Michener, Andrea Campaña
and Mohammad Babadoost

Table 4. Reactions of sweet corn hybrids in the University of Illinois disease nursery in 2001
Statistical Analysis for all hybrids

Statistical Analysis Stewart's
wilt		 Common rust Northern
leaf blight		 Southern
leaf blight		 Gray
leaf spot
Old
race†		 New
race‡
Rxn Rate
(1-9)		 Rxn Rate
(%) 		Rxn Rate
(%) 		Rxn Rate
(%) 		Ht
gene		 Rxn Rate
(%) 		Rxn Rate
(%)
 
BLSD k=100   0.88   5.8   5.9   6.4     6.3   13.6
Mean   4   29.3†   33.4   29.8     22.6   72.4
SD   1.17   9.6†   9.8   11.7     9.6   12.5
Minimum   1.9   0   0   2     4   30
1st Quartile   3.2   1   29   22     15   65
Median   3.9   18   34   29     22   71
3rd Quartile   4.8   30   39   38     29   80
Maximum   7.3   60   62   64     59   100

† Old race of rust - avirulent against the Rp1-D gene (mean and
standard deviation excluding Rp1-D resistant hybrids)
‡ New race of rust - virulent against the Rp1-D gene
Rate = Disease rating:
  0 to 100% leaf area infected (common rust, NLB, SLB, GLS)
  1 to 9 scale (Stewart's wilt)

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