Report to the Oregon Processed Vegetable Commission
2007–2008
1.
Title:
Identification of High Yielding, Root Rot Tolerant Sweet Corn Hybrids
2.
Project Leaders: James R. Myers, Horticulture
3.
Cooperators:
Brian Yorgey, Food Science and Technology
Cindy Ocamb, Botany and Plant Pathology
4.
Project Status:
Terminating 30 June, 2008
5.
Project Funding: $21,721 total
Funds were used for a major portion of the support of a vegetable technician, student labor, supplies, processing plant evaluation of moisture content, and research farm expenses.
6.
Objective: Identify sweet corn hybrids released for the processing market for high and
stable yields under heavy and light root rot pressure.
7.
Report of Progress:
Three trials were planted at two locations on 27 June to evaluate sweet corn hybrids for performance under root rot conditions. Two locations (Vegetable Research Farm and Botany Farm) with
high root rot incidence were used. Both have had continuous corn for at least the past five years.
The fields have slightly different histories in that the Vegetable Farm fields have had no additional inoculum added, whereas the Botany Farm field has had direct Fusarium inoculation and
roots from infected fields added. Sugary/sugary enhanced and supersweet hybrids were grown in
isolation from one another on the Vegetable Farm to allow the collection of ear quality data. At
the Botany Farm, supersweet and sugary types were grown together, and only yield was evaluated. The Vegetable Farm trials consisted of four replicates with two row plots 30 feet in length,
while only one row per plot was established at the Botany Farm. At the Vegetable Farm, one
row of each plot was used to determine yield and for processing evaluation, while the other row
was used for root rot evaluation and determining kernel moisture. Hybrids were planted with a
belt planter then thinned to normal stand (nine inch spacing on 30 in. rows). Data collected included root rot on the primary, mesocotyl and adventitious roots, browning of the nodes, crown
rot at harvest maturity, silking date, kernel moisture, and ear number and weight (including both
cull and net weight). Kernel moisture was determined at the OSU Pilot Plant. Raw product
evaluation was conducted on those hybrids for which seed company funding was obtained (this
included all hybrids this year).
Hybrids evaluated in trials are show in table 1. Five were supersweet and ten were sugary types.
Performance over the locations was fairly uniform, with no variety by environment interaction,
and entries showed similar ranking for yield and root rot parameters across trials. Average net
yields were 6.9, 7.0, and 6.5 T/A, respectively for the Vegetable Farm supersweet, sugary, and
Botany Farm combined trials. Several sugary hybrids (GH 6377, GH 4927, GH 6462, GH 8267,
and GH 2171) equaled or exceeded Coho (tolerant check) for yield at both locations (Tables 2 &
3, Figure 1), with GH 6377 also having excellent ear quality and flavor (Table 5). The other
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
three hybrids in the sugary trial (Evita, GH 6487, and Tamarack) all seemed to be adversely affected by root rot, with yields similar to or worse than Jubilee (susceptible check). Again this
year, GSS 1477 had the highest yield among supersweet types (Tables 2 & 4, Figure 1), but with
ear and kernel variability this year that affected ear quality (Table 6). Of the other supersweet
types, all three (Magnum II, Marvel, and CSH YP3-99) had yields higher than Supersweet Jubilee Plus in the Vegetable Farm plots (Table 4, Figure 1) but only Magnum II had statistically
higher yields at the Botany Farm (Table 2, Figure 1).
Root rot pressure was extremely severe at all three locations with an overall primary root rot of
99.3% (Table 7). Mean by trial for primary root rot was 99% at the Botany Farm (Table 8),
100% in the sugary Vegetable Farm trial (Table 9), and 100% in the supersweet trial at the Vegetable Farm (Table 10). Only Coho (tolerant check) showed statistically lower % infection at
87.5% at the Botany Farm location (Table 8). GSS 1477 did not differ significantly from Coho
at the Botany Farm in the overall analysis for primary root infection, but all other varieties did.
For all parameters, the check cultivars Coho (tolerant) and Jubilee (susceptible) showed relative
ranking as expected. In the overall evaluation, one hybrid (Evita) had significantly less adventitious root rot compared to Coho, and two (GH 6462, Evita) were significantly better than Jubilee
(Table 7, Figure 2). No hybrids had significantly less adventitious root rot than Coho when Botany Farm was analyzed alone, but 3 hybrids (GH 6377, GH 6462, and Evita) were better than
Jubilee in this trial (Table 8). In the Vegetable Farm sugary trial, Evita, was significantly lower
in adventitious root rot compared to Coho, and none were significantly worse (Table 9). Differences were not significant for any of the root rot parameters in the Vegetable Farm supersweet
trial (Table 10). Root worm damage was higher this year than last, with higher readings at both
locations.
When root rot and yield parameters were subjected to correlation analysis, several moderate to
strong significant associations were observed in the analysis of the overall data set (Table 11).
Primary, mesocotyl and adventitious root rot, and crown rot, were all strongly correlated. Brown
node was correlated with adventitious and primary root rot and crown rot, but not significantly
correlated with mesocotyl root rot. The correlation between root worm damage and other root
rot parameters was inconsistent. There was no significant correlation between yield (net T/A)
and primary, mesocotyl or adventitious root rot this year, but brown node, crown rot and root
worm damage were all negatively correlated with yield. Ear diameter and kernel depth also correlated negatively with brown node and crown rot, but not with root worm damage. Ear length
was not correlated with any trait except net T/A, where it showed a weak negative correlation.
We would have expected ear length to be positively correlated with yield. When trials were analyzed separately correlations were weaker, but general tendencies held. In general, the lack of
correlation of primary, mesocotyl and adventitious root rot with yield parameters may be the result of such high incidence, with little variation among hybrids for root characters. Reduction in
yield from brown node and crown rot appears to be due mostly to reduced kernel depth.
8. Conclusions:
A number of hybrids appear to have better performance under root rot conditions than Jubilee
and Supersweet Jubilee. Several sugary hybrids appear to have potential as root rot tolerant replacements for Jubilee. Of these, GH 6377 had the best overall yield performance and very good
ear quality.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 1. Sweet corn entries grown in trials on root rot infested
ground at the Oregon State University Botany and Vegetable
Research Farms, Corvallis, 2007.
Entry
Company
Type
Color
GH 2171
Syngenta
su
yellow
GH 4927
Syngenta
su
yellow
GH 6377
Syngenta
su
yellow
GH 6462
Syngenta
su
yellow
GH 6487
Syngenta
su
yellow
GH 8267
Syngenta
su
yellow
Jubilee
Syngenta
su
yellow
Tamarack
Crookham
su
yellow
Evita
Crookham
su
yellow
Coho
Harris Moran
su
yellow
GSS 1477
Syngenta
sh2
yellow
Magnum II
Syngenta
sh2
yellow
Supersweet Jubilee Plus
Syngenta
sh2
yellow
CSH YP3-99
Crookham
sh2
yellow
Marvel
Crookham
sh2
yellow
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 2. Yield and ear measurements for selected sweet corn hybrids grown in a root rot
z
trial on the OSU botany research farm, Corvallis, 2007.
Gross
T/A
Net
Ears
/Plot
(no.)
Ears
/Plant
(no.)
Lb/Ear
Net
T/A
Culls
T/A
29.3
13.8
36.3
1.25
0.55
8.8
0.13
29.3
12.9
33.0
1.14
0.55
7.8
0.00
96
26.8
11.2
29.3
1.09
0.60
7.5
0.03
GH 4927
86
27.8
11.2
30.0
1.08
0.57
7.4
0.12
GH 6462
100
28.0
11.2
26.3
0.94
0.64
7.3
0.14
GH 8267
100
27.3
10.8
28.0
1.03
0.59
7.2
0.00
GH 2171
90
30.5
10.3
28.0
0.92
0.58
7.1
0.14
Magnum II
100
28.3
10.6
25.5
0.90
0.57
6.3
0.26
Days to
Harvest
Plants
/Plot
(no.)
GH 6377
98
Coho
99
GSS 1477
Entry
Evita
98
28.5
10.3
24.5
0.88
0.55
5.9
0.00
GH 6487
93
27.5
9.7
25.0
0.91
0.53
5.8
0.32
Tamarack
97
29.3
9.6
22.0
0.75
0.59
5.7
0.16
Marvel
Supersweet
Jubilee
Plus
CSH YP399
90
26.5
8.6
22.0
0.83
0.58
5.6
0.00
93
26.5
8.1
23.3
0.88
0.47
4.8
0.22
96
27.0
9.1
19.5
0.73
0.55
4.7
0.13
93
30.5
8.0
23.8
0.79
0.46
4.7
0.32
NS
1.4
4.5
0.18
0.05
1.0
0.23
Jubilee
LSD 0.05
y
z
Planted June 27 in rows 30" apart, thinned to 9" between plants. Harvested plot length was
20'. Gross T/A is the weight of all harvested unhusked ears. All values shown are means of 4
replications arranged in randomized complete blocks. All data except cull T/A were obtained
from typical husked good ears.
y
NS = Non-significant.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 3. Yield and ear measurements for selected sugary sweet corn hybrids grown in a root rot trial on the OSU vegetable rez
search farm, Corvallis, 2007.
Gross
T/A
Net
Ears
/Plot
(no.)
Ears
/Plant
(no.)
26.5
12.2
32.0
73.4
26.5
11.8
85
72.9
25.5
GH 6377
97
73.7
Coho
99
GH 6462
Days to
Harvest
%
Moisture
Plants/Plot
(no.)
GH 8267
100
74.6
GH 2171
89
GH 4927
Lb/Ear
Net
T/A
Culls
T/A
Ear
Length
(in.)
Ear
Dia.
(in.)
Kernel
Depth
(mm)
Tenderness
1.21
0.58
8.2
0.17
7.6
2.00
12.9
97
28.3
1.06
0.66
8.2
0.33
7.5
2.16
14.0
85
12.2
30.8
1.21
0.61
8.1
0.70
8.0
2.01
11.9
91
27.0
12.2
31.8
1.18
0.57
8.0
0.04
7.5
1.93
11.5
82
74.3
25.8
13.0
32.3
1.25
0.56
7.9
0.08
6.9
2.04
14.0
86
99
74.6
27.0
12.2
26.0
0.96
0.70
7.9
0.17
7.6
2.11
13.3
77
Evita
98
74.4
26.8
10.2
24.0
0.89
0.58
6.1
0.10
7.7
1.96
12.0
96
Jubilee
93
71.2
24.3
7.5
21.8
0.89
0.62
6.0
0.17
7.1
1.83
11.9
81
GH 6487
92
72.6
26.5
8.5
23.5
0.89
0.51
5.2
0.19
7.6
1.86
12.3
78
Tamarack
96
72.5
24.8
7.1
16.8
0.67
0.60
4.3
0.45
7.4
1.96
12.0
111
2.3
2.3
6.0
0.20
0.14
1.8
0.42
0.2
0.05
1.0
11
Entry
LSD 0.05
z
Planted June 27 in rows 30" apart, thinned to 9" between plants. Harvested plot length was 20'. Gross T/A is the weight of all harvested
unhusked ears. All values shown are means of 4 replications arranged in randomized complete blocks. All data except cull T/A were obtained from typical husked good ears. For ear length and ear diameter, the value used for each replication was the average of 10 individual
primary ear measurements. Tenderness value is the average of 10 individual primary ear measurements per replication, determined by a
spring-operated puncture gauge; lower numbers indicate more tender pericarp.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 4. Yield and ear measurements for selected supersweet corn hybrids grown in a root rot trial on the OSU vegetable research
z
farm, Corvallis, 2007.
Gross
T/A
Net
Ears
/Plot
(no.)
Ears
/Plant
(no.)
28.3
12.5
28.8
77.1
28.0
11.8
93
77.4
27.8
89
77.8
92
77.0
Days to
Harvest
%
Moisture
Plants/Plot
(no.)
GSS 1477
93
77.2
Magnum II
CSH YP399
99
Marvel
Supersweet
Jubilee
Plus
Entry
LSD 0.05
y
Lb/Ear
Net
T/A
Culls
T/A
Ear
Length
(in.)
Ear
Dia.
(in.)
Kernel
Depth
(mm)
Tenderness
1.02
0.68
8.8
0.07
8.1
2.03
13.0
106
25.8
0.92
0.65
7.4
0.23
8.0
2.23
13.8
93
11.2
26.8
0.97
0.59
6.9
0.17
7.8
1.98
11.3
99
26.3
9.7
25.0
0.95
0.62
6.8
0.09
7.9
2.00
12.0
88
25.8
7.9
22.0
0.86
0.50
4.7
0.17
7.5
1.88
11.0
82
NS
1.5
4.0
0.12
0.04
1.1
NS
0.2
0.15
1.3
10
z
Planted June 27 in rows 30" apart, thinned to 9" between plants. Harvested plot length was 20'. Gross T/A is the weight of all harvested
unhusked ears. All values shown are means of 4 replications arranged in randomized complete blocks. All data except cull T/A were obtained from typical husked good ears. For ear length and ear diameter, the value used for each replication was the average of 10 individual
primary ear measurements. Tenderness value is the average of 10 individual primary ear measurements per replication, determined by a
spring-operated puncture gauge; lower numbers indicate more tender pericarp.
y
NS = non-significant.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 5. Ear quality evaluations for selected sugary sweet corn hybrids grown in a root rot trial on the OSU vegetable research farm,
z
Corvallis, 2007.
Uniformity
Shape
Refinement
Row
Straightness
Tip
Fill
Ear
Maturity
Kernel
100
4
3.5
2.5
5
3
2.5
GH 2171
89
2.5
2.5
2.5
3
3
GH 4927
85
3.5
2.5
2.5
3
3.5
Days to
Harvest
GH 8267
Entry
Flavor
Overall
Score
Row
No.
2.5
3
3
16-18
3.5
2.5
3
2.5
18-20
4
2
2
2.5
18
Notes
Good yield
Some culls have very
large kernels; some
half-filled ears
Some curved ears;
not sweet; uneven
kernels
GH 6377
97
4
4.5
3
3
3
3
4
4.5
3.5
20
Coho
99
3
2.5
3
5
3
4
3
4
4
20
Small ears; very good
flavor; good yield with
many second ears
Deep kernels; good
flavor
GH 6462
99
3
3.5
3
3.5
3
3
2.5
3
3
18
Good corn flavor but
little sweetness
Evita
98
3
3.5
4
2.5
2.5
2
3.5
3.5
3
20
Jubilee
93
4.5
4
3
4
2.5
2.5
4
4
3
16-18
GH 6487
92
4
3.5
4
3
4
4.5
4
4
4
16-18
Tamarack
96
2
2
3
3
2
2
2
2
2
16-18
z
Planted June 27. Scores based on a 1-5 scale, with 5 = best.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Variable for maturity;
poor tip fill
Highly variable and
yield is down; probably due to root rot infection
Uniform; excellent
quality; low yield may
be due to root rot infection
Small yellowing plants
appear to be root rot
infected; oval cobs;
tapered shape
Table 6. Ear quality evaluations for selected supersweet corn hybrids grown in a root rot trial on the OSU vegetable research farm, Corz
vallis, 2007.
Uniformity
Entry
Days
to Harvest
Shape
Refinement
Row
Straightness
Tip
Fill
Ear
Maturity
Kernel
Flavor
Overall
Score
Row
No.
Notes
GSS 1477
93
3.5
2.5
2.5
2.5
2.5
3.5
3
3
3
18
Magnum II
CSH YP399
99
2.5
1.5
2
2
2
2
2.5
2.5
2
18
93
4
4
2.5
3
3
2.5
3
3
3
18-20
Good yield; very sweet but
not much corn flavor; best
ears are nice but coarse and
much variability; tough
Highly variable; very large
kernels; poor tip fill
Pale color; mild flavor with
"green" after taste
89
3.5
2
2.5
2
2.5
2.5
2
3.5
3
16-18
Highly variable; curved ears
92
4
4.5
4.5
4
3
3
4
4
4
16-18
Somewhat variable--probably
due to root rot infection
Marvel
Supersweet Jubilee Plus
z
Planted June 27. Scores based on a 1-5 scale with 5 = best.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 7. Overall root disease ratings of sweet corn hybrids grown at the OSU Botz
any and Vegetable Research Farms, Corvallis, 2007
Entry
Primary root rot
(%)
Mesocotyl
root rot (%)
Adventitious
root rot (%)
Brown
y
node
Crown rot
Evita
100.0
100.0
56.3
1.46
0.88
1.42
GH 6462
100.0
100.0
69.4
2.58
0.98
1.25
Coho
93.8
98.3
71.7
1.13
0.73
1.13
CSH YP3-99
99.6
99.6
75.0
2.38
0.96
1.42
Magnum II
100.0
99.4
75.8
1.71
0.90
1.50
GH 8267
100.0
99.6
76.3
2.08
0.83
1.50
GH 6377
100.0
100.0
77.9
2.13
0.88
1.21
GSS 1477
96.9
98.8
79.6
2.00
0.88
1.38
GH 6487
SS Jubilee
Plus
100.0
100.0
82.1
2.67
1.00
1.25
100.0
100.0
82.3
2.71
1.00
1.21
Jubilee
99.8
100.0
84.0
2.83
0.98
1.67
GH 2171
100.0
100.0
85.6
1.58
0.81
1.46
Marvel
100.0
100.0
86.0
2.00
0.98
1.33
Tamarack
100.0
100.0
89.4
1.92
0.96
1.34
GH 4927
100.0
99.2
94.4
2.67
1.00
1.42
LSD 0.05
5.0
1.4
10.6
0.57
0.12
0.41
z
Trials planted June 27. Plants dug and rated October 11. Combined data from 2 trials per
entry, 4 reps per trial, 3 plants per rep.
y
Number of nodes above the soil line with brown discoloration.
x
Scale of 0-1.5 with 0=no crown discoloration, 0.5=beginning of discoloration, 1=crown rot
present with black discoloration.
w
Scale of 1-3 with 1=no evidence of feeding, 2=less than 75% adventitious roots with feeding, 3=more than 75% roots with feeding.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
x
Root
w
worm
Table 8. Root disease ratings of sweet corn hybrids grown at the OSU Botany
z
Farm, Corvallis, 2007 .
Entry
Primary
root rot
(%)
Mesocotyl
root rot
(%)
Adventitious
root rot (%)
Brown
y
node
Crown rot
x
Root
w
worm
Evita
GH 6462
Coho
GH 6377
CSHYP3-99
GH 6487
GSS 1477
Magnum II
GH 8267
SS Jubilee
Plus
Jubilee
Marvel
Tamarack
GH 2171
GH 4927
100.0
100.0
87.5
100.0
99.2
100.0
93.8
100.0
100.0
100.0
100.0
96.7
100.0
99.2
100.0
97.5
98.8
99.2
55.4
61.7
62.5
63.3
70.0
73.8
73.8
74.2
75.8
1.42
2.17
0.92
2.25
2.17
2.83
1.58
1.17
2.00
1.00
1.00
0.75
0.83
0.92
1.00
0.75
0.79
0.79
1.33
1.00
1.08
1.00
1.00
1.00
1.00
1.17
1.17
100.0
99.6
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
98.3
80.4
82.1
82.9
84.2
90.4
94.2
2.75
2.83
1.67
1.67
1.67
2.58
1.00
1.00
0.96
0.92
0.96
1.00
1.00
1.17
1.00
1.00
1.00
1.08
LSD 0.05
10.1
2.6
16.8
0.89
0.18
0.30
z
Trials planted June 27. Plants dug and rated October 11. Data from 1 trial, 4 reps
per trial, 3 plants per rep.
y
Number of nodes above the soil line with brown discoloration.
x
Scale of 0-1.5 with 0=no crown discoloration, 0.5=beginning of discoloration,
1=crown rot present with black discoloration.
w
Scale of 1-3 with 1=no evidence of feeding, 2=less than 75% adventitious roots
with feeding, 3=more than 75% roots with feeding.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 9. Root disease ratings of sugary sweet corn hybrids grown at the OSU Vegetable
z
Research Farm, Corvallis, 2007 .
Entry
Evita
GH 8267
GH 6462
Coho
GH 2171
Jubilee
GH 6487
GH 6377
Tamarack
GH 4927
LSD 0.05
Primary
root rot (%)
Mesocotyl
root rot (%)
Adventitious
root rot (%)
Brown
y
node
Crown rot
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
57.1
76.7
77.1
80.8
80.8
85.8
90.5
92.5
94.6
94.6
1.50
2.17
3.00
1.30
1.50
2.83
2.50
2.00
2.17
2.75
0.75
0.88
0.96
0.71
0.67
0.96
1.00
0.92
1.00
1.00
1.50
1.83
1.50
1.17
1.92
2.17
1.50
1.42
1.50
1.75
14.0
0.76
0.20
0.74
x
Root
w
worm
z
Trials planted June 27. Plants dug and rated October 11. Data from 1 trial, 4 reps per trial, 3
plants per rep.
y
Number of nodes above the soil line with brown discoloration.
x
Scale of 0-1.5 with 0=no crown discoloration, 0.5=beginning of discoloration, 1=crown rot present with black discoloration.
w
Scale of 1-3 with 1=no evidence of feeding, 2=less than 75% adventitious roots with feeding,
3=more than 75% roots with feeding.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Table 10. Root disease ratings of supersweet corn hybrids grown at the OSU Vegetable
z
Research Farm, Corvallis, 2007 .
Primary
root rot
(%)
Mesocotyl
root rot
(%)
Adventitious
root rot (%)
Brown
y
node
Crown
x
rot
Root
w
worm
Magnum II
100.0
100.0
77.5
2.25
1.00
1.83
CSH YP3-99
100.0
100.0
80.0
2.58
1.00
1.83
SS Jubilee Plus
100.0
100.0
84.2
2.67
1.00
1.42
GSS 1477
100.0
100.0
85.4
2.42
1.00
1.75
Marvel
100.0
100.0
89.2
2.33
1.00
1.67
ns
ns
Entry
LSD 0.05
v
ns
z
Trials planted June 27. Plants dug and rated October 11. Data from 1 trial, 4 reps per trial, 3
plants per rep.
y
Number of nodes above the soil line with brown discoloration.
x
Scale of 0-1.5 with 0=no crown discoloration, 0.5=beginning of discoloration, 1=crown rot present with black discoloration.
w
Scale of 1-3 with 1=no evidence of feeding, 2=less than 75% adventitious roots with feeding,
3=more than 75% roots with feeding.
v
ns=non-significant.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
z
Table 11. Correlation among root disease and yield traits for sweet corn hybrids grown at three locations, Corvallis, Oregon, 2007.
Mesocotyl
root rot
Primary root
rot
0.77
Mesocotyl
root rot
1.00
Adventitious
root rot
Brown node
Crown rot
Root worm
Adventitious
root rot
***
Brown
Node
Crown rot
Root worm
Gross T/A
Net T/A
Ear Length
Ear Diam
Kernel depth
0.24
**
0.18
*
0.35
***
0.10
ns
-0.18
+
-0.11
ns
0.11
ns
0.01
ns
-0.001
ns
0.20
**
0.13
ns
0.29
**
0.10
ns
-0.11
ns
-0.11
ns
0.02
ns
0.04
ns
0.05
ns
0.38
***
0.26
**
0.24
**
-0.20
*
-0.14
ns
0.04
ns
-0.06
ns
-0.14
ns
0.50
***
0.22
*
-0.18
*
-0.24
**
0.10
ns
-0.18
*
-0.25
**
0.11
ns
-0.29
**
-0.35
***
0.16
+
-0.16
+
-0.21
*
-0.03
ns
-0.29
**
0.08
ns
0.12
ns
0.05
ns
0.45
***
0.14
ns
0.54
***
0.47
***
-0.23
*
0.11
ns
0.26
**
0.16
+
-0.06
ns
0.55
***
1.00
1.00
1.00
1.00
Gross T/A
1.00
Net T/A
1.00
Ear Length
1.00
Ear Diam
1.00
z
Significantly different at: + = 90%, * = 95%, ** = 99% and *** = >99.9% probability levels. ns = not significant.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Botany
Veg su
Veg sh2
10.0
9.0
8.0
Net Yield ( T/ A)
7.0
6.0
5.0
4.0
3.0
2.0
1.0
LSD 0.05
Jubilee
CSH YP3-99
Supersweet Jubilee
Plus
Marvel
Tamarack
GH 6487
Evita
Magnum II
GH 2171
GH 8267
GH 6462
GH 4927
GSS 1477
Coho
GH 6377
0.0
Figure 1. Net yield for sweet corn hybrids grown at 3 locations, Corvallis, Oregon, 2007. Botany = Botany Farm, where both supersweet and sugary
hybrids were grown; Veg su = Vegetable Farm sugary hybrid trial; Veg sh2 = Vegetable Farm supersweet hybrid trial.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Botany
VF su
GH 8267
Magnum II
VF sh2
100.0
90.0
80.0
Adventitious root rot (%)
70.0
60.0
50.0
40.0
30.0
20.0
10.0
Evita
GH 6462
Coho
GH 6377
CSHYP3-99
GSS 1477
GH 6487
SS Jubilee Plus
Jubilee
Marvel
Tamarack
GH 2171
GH 4927
0.0
Figure 2. Adventitious root rot of sweet corn hybrids grown at three locations, Corvallis, Oregon, 2007. Botany = Botany Farm where both supersweet and sugary hybrids were grown; Vegsu = Vegetable Farm sugary hybrid trial; Veg sh2 = Vegetable Farm supersweet hybrid trial.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Botany
VF su
CSHYP3-99
GH 8267
VF sh2
3.50
3.00
No. brown nodes above soil
2.50
2.00
1.50
1.00
0.50
Coho
Magnum II
Evita
GSS 1477
GH 2171
Tamarack
Marvel
GH 6462
GH 6377
GH 4927
SS Jubilee Plus
Jubilee
GH 6487
0.00
Figure 3. Number of nodes above the soil line with internal browning for sweet corn hybrids grown at three locations, Corvallis, Oregon, 2007. Botany = Botany Farm where both supersweet and sugary hybrids were grown; Veg su = Vegetable Farm sugary hybrid trial; Veg sh2 = Vegetable Farm
supersweet hybrid trial.
2007-2008 Sweet Corn Hybrid Evaluation Progress Report
Botany
VF su
1.20
1.00
Crown rot (%)
0.80
0.60
0.40
0.20
GSS 1477
Coho
GH 8267
Magnum II
GH 6377
Tamarack
CSHYP3-99
GH 2171
Marvel
GH 4927
Jubilee
SS Jubilee Plus
GH 6487
GH 6462
Evita
0.00
Figure 4. Crown rot rating for sweet corn hybrids grown at three locations, Corvallis, Oregon, 2007. Botany = Botany Farm where both supersweet
and sugary hybrids were grown; Veg su = Vegetable Farm sugary hybrid trial. Crown rot rating was the same (1.00) for all hybrids in the Vegetable
Farm supersweet trial..
2007-2008 Sweet Corn Hybrid Evaluation Progress Report