xt7fxp6tzs3q https://exploreuk.uky.edu/dips/xt7fxp6tzs3q/data/mets.xml   Kentucky Agricultural Experiment Station. 1964 journals 143 English Lexington : Agricultural Experiment Station, University of Kentucky Contact the Special Collections Research Center for information regarding rights and use of this collection. Kentucky Agricultural Experiment Station Progress report (Kentucky Agricultural Experiment Station) n.143 text Progress report (Kentucky Agricultural Experiment Station) n.143 1964 2014 true xt7fxp6tzs3q section xt7fxp6tzs3q I REACTION OF HYBRIDS AND STRAINS OF CORN TO VIRUS
V QSEASE IN BRACKEN AND LEWIS COUNTIES. KENTUCKY
QQ?.
F. A. Loeffel, IJ. F. Shane and E. M. Johnson
Three groups of material were grown in the Ohio River bottom in Bracken and
A Lewis counties and evaluated for reaction to the virus disease complex. in 1964. The
virus (s) were present at both locations in 1963 and 1964 and caused severe losses.
A Commercially available hybrids entered in the 1964 Kentucky Hybrid Corn
Performance Test were compared in three replications per location. Established inbred
lines and S4 lines derived from Corn Belt X Mexican crosses were also grown in two
replications at each location. Segregating breeding populations involving germ plasm
a from the Corn Belt crossed to other sources, including several Mexican sources, were
grown in 10-row 350—plant populations. V
The tests, located on the Gerhard Brothers farm in Bracken county and the
Alex Waters, Jr. farm in Lewis county, were planted on May 19 and 20, respectively.
Plants did not develop_normally during the early part of the growing season because of
lack of moisture and competition from Johnsongrass. This complicated the evaluation
of reaction to the virus disease complex.
First symptoms indicating virus infection in plants were noted July 10, seven
weeks after planting. No symptoms were observed on June 23.
A scale of 1 to 9 was used in rating plants, with 1 indicating no symptoms of
the virus and 9 indicating complete susceptibility. Plants in the segregating breeding
populations were rated on an individual plant basis and in the replicated material on a
plot basis. Observations on reaction to the virus were made August 21 and on the S4
and established inbred lines and on August 25 and 26 on the remainder of the tests. A
high degree of association between ratings made independently by Loeffel and Shane on·
` PROGRESS REPORT 143
(Filing cme 1-.1;
UNIVERSITY OF KENTUCKY AGRICULTURAL EXPERIMENT STATION
Departments of Agronomy and Plant Pathology
Lexington

 the commercially available hybrids was shown by a correlation coefficient of 0. 87 for
Bracken county and 0. 85 for Lewis county. The correlation coefficient for ratings
between counties was 0.51.
The distribution of hybrids grouped by visual rating classes are presented in y
Table 2. The combined rating and the rating from individual locations for each hybrid
are presented in Table 1. Percentage of plants infected and visual ratings of the inbred S
lines are presented in Table 3. Visual ratings of S4 and established inbred lines are .
given in Tables 4 and 5 and show the distribution of plants by class on a plant and per-
centage basis, respectively. These ratings indicate that S4 lines ranging from a high U
degree of tolerance to complete susceptibility may be obtained from a given breeding
population not previously selected for reaction to the virus complex.
Plants in the segregating breeding populations were rated on an individual plant
basis on August 25. The material and the percentage of infection present on July 21 are
given in Table 6. Progeny from approximately 750 selfed plants from these populations
will be grown in 1965 to determine parent-progeny relationships.
The results presented in this report should be treated with caution since they
were obtained from only one year‘s observation. Differences in the rating of certain
hybrid entries between locations suggest that additional information is needed before .
definite conclusions can be made. Data from replicated yield trials conducted in virus I
infected areas are needed, as well as visual injury ratings, to assess fully the reaction
of specific genotypes to the virus complex. ·
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 d Table 1. — Visual Rating of Corn Virus Reaction of Commercially Available Hybrids
Evaluated in Bracken and Lewis Counties of Kentucky in 1964. 1/
Endosperm Bracken Lewis
Hybrid Color Average County County
l Pioneer 51lW W 2.5 2.7 2.3
Princeton 790-AA W 2. 7 2.0 3. 3
Ky 105 Y 3. 0 2.0 4.0
Stull 8OOW W 3.0 2.7 3.3
PAG SX19 Y 3.2 3.3 3.0
PAG SX29 Y 3.2 1.7 4.7
S.S. Catawba Y 3.3 1.3 5.3
Stull 400W W 3. 4 2.7 4.0
V Hagan H—9 Y 3.5 3.7 3.3
Pioneer 509W W 3.5 2.3 4.7
DeKalb XL—385 Y 3. 7 4.0 3. 3
Princeton 890 —AA Y 3. 7 3. 3 4.0
DeKalb 1006 Y 3. 8 3.3 4. 3
Ken—Bred F20W W 3. 8 4. 3 3.3
PAG SX59 Y 3.9 2.0 5.7
Hagan H—2 W 4.0 4.3 3.7
~ Ky 5921W W 4.0 4.0 4.0
AES 809 Y 4.2 2.7 5.7
Princeton 990-A W 4. 2 4.0 4. 3
Stull 444W W 4. 2 3. 7 4. 7
S.S. 909E Y 4.3 5.3 3.3
S.S. 979 4.3 4.3 4.3
Meacham M—33YB Y 4. 4 4.0 4. 7
Pioneer _309A . Y 4. 5 3.0 6.0 A
Pioneer X—2280 Y 4. 5 6.0 3.0
V Kamp 913 BRK W 4.7 5.7 3.7
Stull 101YB Y 4. 8 4.3 5. 3
PAG SX63 Y 4.9 4.7 5.0
S.S. 860 5.0 4.3 5.7
Stull 807YA Y 5.0 6.0 4.0
Crib Filler 183W W 5. 2 5.0 5. 3 h
Meacham MX-50 W 5. 2 5.0 5. 3
Pioneer 3304 Y 5. 2 4. 7 5. 7
Schenks—96W W 5. 2 4. 7 5. 7
S.S. Matoaka Y 5.2 5.0 5.3
Ky 5901W W 5.3 5.0 5.7
PAG 437 Y 5.4 5.0 5.7
Crib Filler 66 Y 5. 5 5.0 6.0
DeKalb XL—390 W 5. 7 6.0 5. 3
Kamp 910B W 5.7 5.3 6.0
Pioneer 310 Y 5. 7 6.0 5. 3
S.S. Munsee _ Y 5.7 6.3 5.0
(Continued)
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 Table 1. — Continued ’
Endosperm Bracken Lewis
Hybrid Color Average County County
DeKalb 633 Y 5. 8 7.3 4.3 .
Schenk S—73A Y 5. 8 6.3 5. 3
Ky 6001 Y 5.9 6.0 5.7
Pioneer 312A Y 5.9 6.7 5.0 · ‘
Hilligoss 9X3L Y 6.0 6.0 6.0
Princeton 888-A Y 6.0 6.0 6.0
S.S. 8205 Y 6.0 5.7 6.3 0
Crib Filler 55 Y 6. 2 5.7 6.7 A
Dixie's 99-Y Y 6.2 6.0 6.3
Hilligoss 84M Y 6.2 6.7 5.7
Ken—Bred E—2OYA Y 6. 2 7.0 5. 3
Meacham MX—30 Y 6. 2 6. 7 5. 7
Princeton SX—800 Y 6. 2 5. 7 6. 7
Stull 807Y Y 6.2 6.0 6.3 »
DeKalb 824 Y 6.3 7.3 5.3
Crib Filler 123 Y 6.4 7.7 5.0
Ken—Bred Sx20Y Y 6.4 5.7 7.0
Princeton 8-A Y 6.4 8.0 4. 7
Crib Filler 78 Y 6.5 6.0 7.0
DeKalb 640Y Y 6.5 6.3 6.7
Princeton 8-X Y 6. 5 6.0 7.0
DeKalb 805 Y 6. 7 6.7 6.7
DeKalb XL65 Y 6. 8 7. 3 6. 3 -
Stull 100YB Y 6. 9 6.7 7.0
Princeton 840 —A Y 7.0 7. 7 6. 3
SS.755 7.0 6.7 7.3
Pioneer 321 Y 7.2 8.0 6.3
U.S. 523W W 7.2 7.0 7.3 A
Meacham M—5 W 7.4 7.0 7. 7
Schenk S—73 Y 7. 4 7.0 7.7 *
 
U Li · I ` I I
1 No injury, 9 Very susceptible
Table 2. — Corn Virus Visual Ratings, Commercial Hybrids
Av. Rating Range Number of Hybrids
2.0 - 2. 9 2
3.0 — 3.9 13
4.0 — 4. 9 13
5. 0 — 5. 9 18
6.0 — 6. 9 20
7.0 — 7. 9 6
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 ‘ Table 3. - Virus Reaction of Inbred Lines Evaluated in Kentucky in 1964
Visual
_ Inbred 979 Infection Rating U
H 49 40 3. 5
H 55 100 8.0
B 37 100 4. 5
_ CI 21 E 0 1.0
C 103 80 4.0
Ky 36-11 100 9.0
Ky 59-3445-1 100 6.0
Ky 59-3613 100 9.0
Ky 59-3617 80 1.0 to 9.0 Segregating
Oh 7 A 17 1. 5
Ky 201 100 7.0
Ky 211 75 7. 5
Ky 216 91 7.0
Ky 217 22 4.0
Ky 218 100 8.0
Ky 219 62 5. 5
l Ky 62-2488 100 8. 5
F 163 100 8.0
CI 64 100 8.0
CI 66 37 4. 5
U 1 - No in` - ` ' '
- Jury, 9 — Complete susceptibility
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 Table 4. — Ccrn Virus Visual Rating ·
 
‘ Material N0. 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
N.C.Ia.D.D.C.X .
Cuba 38 #3 S4 52 8 4 5 12 8 6 6 3  
S.L.P. 20 #3 S4 36 6 6 3 5 7 5 4 —
Ccah 8 #3 S4 10 3 1 4 — — 1 1 —
Tamps 3 #3 S3 2 1 —————— 1
Ver 15 #3 S4 4 1 1 1 — 1 — — —
T 2 #3 S3 3 1 — 1 — 1 — — — _
Inbreds 20 2 — 3 2 3 2 5 3
Table 5. — Percentage 0f Infection
  t
Mzitcrizil N0_ 10 20 30 40 50 60 70 80 90 100
N. C.Izi. D. D. C. X
Cuba 38 #3 S4 52 4 3 3 1 7 3 3 7 8 13
S.L.P. 20 #3 S4 36 5 2 3 1 3 2 2 2 5 11 V
Cozih 8 #3 S4 10 3 — — — 2 — — 2 — 3
Tzimps 3 #3 S3 2 1 ———————— 1
Vcr 15 #3 S4 4 1 —————— 1 — 2
T 2 #3 S3 3 —————— 1 — — 2
Inbrcds 20 1 1 1 1 1 — 1 3 — 11
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 Table 6. — Segregating Breeding Populations, Bracken County. 1964
l  
· Material July 21
‘ %
Gourd Seed x Salzers White Flint #3 gen 21
- Gourd Seed x Mandan White Flint #3 gen 70
Gourd Seed x Longfellow Flint #3 gen 39
Composite of USDA So. African Syn x A188, A305, A308, A312 #3 gen 19
· Composite of Neal Paymaster x A188, A305, A308, A312 #3 gen 28
Lancaster x Mexican Synthetic (White_Composite) #3 gen 22
Lancaster x Mexican Synthetic (Yellow Composite) #3 gen 14
Lancaster Stalk Rot x S. C. Composite White @#3 gen 41
USDA Blight Resistant Synthetic @#3 gen 24
A N.C.la.D.D.C. x Coah #3 gen®#1 gen X #2 gen 14
N.C.Ia.D.D.C.   Ver 15 #3 gen® #1 gen X #2 gen 21
N.C.Ia.D.D.C. xTamps 3#3 gen®#2 gen 9 K
3M—1—65
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