Table 2. Evaluation of GEM hybrids from Iowa for fall armyworm and corn earworm resistance in Tifton, GA 2012
FAW resistance
Plot
3407
3411
3413
3416
3415
3412
3410
3403
3414
3402
3406
3405
3408
3409
3401
3417
3404
3418
Tift
Entry
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Dr. Blanco
Entry
1
2
3
4
5
18
19
20
21
22
23
27
28
29
30
DKC69-71
DKC69-72
DKC67-88
Pedigree
Source
Info
Type
GEMN-0204/LH200
GEMN-0205/LH200
GEMS-0202/LH283
GEMS-0201/LH283
GEMS-0206/GEMN-0186
GEMS-0115/GEMS-0219
LH195/GEMS-0115
GEMN-0196/GEMN-0205
GEMS-0215/GEMS-0219
GEMN-0217/GEMN-0192
GEMN-0217/GEMN-0205
GEMS-0219/GEMN-0204
GEMS-0115/GEMN-0205
ANTIG03:N1242-B-007/HC33
GEMN-0210/GEMN-0205
DK69-71-Tifton control- one-Bt gene-R
DK69-72-Tifton control-non-Bt-gene-S
DK67-88-Tifton control- triple-Bt-genes-R
08TPX0015
08TPX0036
08TPX0141
08TPX0153
09TPX1935
11GEM06380
11GEM06384
11GEM06386
11GEM06389
11GEM06391
11GEM06392
11TPX0002
11TPX0022
11TPX1864
11GEM06388
Retest
Retest
Retest
Retest
Retest
New
New
New
New
New
New
New
New
New
New
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
Hybrid
FAW7d
1.88
1.38
1.75
1.88
1.75
1.75
2.75
1.63
1.63
1.75
1.63
1.88
1.75
2.25
2.00
1.00
2.38
1.00
a
FAW14d FAWmean
3.75
2.81
2.50
1.94
3.75
2.75
3.00
2.44
3.25
2.50
3.88
2.81
5.25
4.00
2.75
2.19
3.25
2.44
3.50
2.63
2.50
2.06
3.50
2.69
3.25
2.50
3.25
2.75
3.50
2.75
1.00
1.00
5.00
3.69
1.00
1.00
CEW resistanceb
Husk
Extension CEW damage
tightness
(cm)
(cm)
3.3
3.75
1.38
3.58
3.03
0.95
3.48
1.13
1.51
3.35
2.93
0.75
3.7
5.18
1.2
3.98
4.58
0.8
3.7
6.15
0.8
3.75
3.18
0.75
3.93
0.65
1.15
3.6
3.03
1.13
3.23
1.8
0.53
3.5
3
1.15
3.6
2.68
1.18
3.75
2.35
1.15
3.53
3.13
0.48
3.35
1.3
0.5
3.53
0.75
1.15
3.5
3.15
0.43
a FAW damage was rated based on a visual rating scale of 1-9; 1=no damage, and 9= complete defoliation; The fall armyworm damage was rated on 7 and 14 d after the artificial
infestation with at least 20 neonate larvae
b The corn earworm damage was assessed using artificial infestation as well. The corn ears with fresh silk at flowering time were infested with 2-5 corn earworm eggs. The eggs were
suspended in 0.2% agar solution, and applied on the fresh silk using a soap dispenser. The corn earworm damage was assessed at pre-harvest.
CEW resistance was rated besed on CEW damage, husk tightness and husk extension; CEW damage was rated by worm penetration into the cob (cm);
Husk tightness was rated 3 weeks after flowering with a scale of 1-5; 1=very loose husk and 5= very tight husk; Husk extension is measured at pre-harvest with the length (cm) of husk
above the tip of the cob.