xt77d7958f4g https://exploreuk.uky.edu/dips/xt77d7958f4g/data/mets.xml   Kentucky Agricultural Experiment Station. 1965 journals 160 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.160 text Progress report (Kentucky Agricultural Experiment Station) n.160 1965 2014 true xt77d7958f4g section xt77d7958f4g _ A _ INVESTIGATIONS OF I
` PLANT REACTION TO THE MAIZE DWARF MOSAIC VIRUS
1965
By Frank A. Loeffel and E. M. Johnson
I Progress Report 160
UNIVERSITY OF KENTUCKY
; AGRICULTURAL EXPERIMENT STATION
Departments of Agronomy and Plant Pathology
Lexington

 Am

 ; INVESTIGATIONS OF PLANT REACTION TO THE MAIZE DWARF MOSAIC VIRUS - 1965
By Frank A. Loeffel and E. M. Johnson
Five groups of material were evaluated in 1965 for plant reaction to the maize
dwarf mosaic virus (MDM) at three testing locations in Kentucky where the virus was
present. Two of the locations, Augusta and Vanceburg, are in the Ohio river valley. The
Frankfort location is in the Kentucky river valley. Severe disease conditions were present `
naturally at each evaluation site in 1965 as well as in the two previous years. Heavy ·
infestations of J ohnsongrass were present at each location. Visual symptoms of virus
were evident in the J ohnsongrass at Frankfort when the trials were planted and within two
weeks of planting at Augusta and Vanceburg. The cooperating farmers, the fertilizer used,
and the dates of planting, virus rating, and harvest were as follows:
 
Date
Virus
Lggation Coopertor Fertilizer Planting Rating Harvest
Augusta George and Paul Gearhart 320# NH4NO3 5/17 8/19 10/16 ·.
- 133# Superphosphate
133# Muriate of potash
Vanceburg Alex Waters, jr. 1000# 5-10-10 5/18 8/18 11/1
_ Frankfort Mason and Ralph Bates 300# NH4NO3 5/ 14 8/23 —--—-
100g Mmiate of Etash
Evaluation of MDM virus reaction was made on:
1. Commercial hybrids being compared in the Kentucky Hybrid Corn Perform-
ance test,
2. Experimental single- and double-cross hybrids from the University of Ken-
. tucky,
3. Commercial and experimental hybrids from industry,
4. A 10-line diallel of yellow single-cross hybrids, and
5. 144 inbred lines from state and federal sources.
The four groups of hybrids were compared in replicated trials in 2 x 5 hill plots at
a population of 15, 680 plants per acre. Data were recorded in respect to yield, root and
stalk lodging, ear height, harvest moisture and harvest stand in addition to MDM virus
ratings. The harvest stand of extremely susceptible hybrids tends to be low owing to the
` total disintegration of prematurely killed plants by harvest. Comparable stands were
present at thimming. Only MDM virus ratings were recorded on the inbred line study which
was grown at Vanceburg and Frankfort in two replications per location. _
A scale of 1 to 9 was used in rating plants. A rating of 1 indicates no injury and a
rating of 9 complete susceptibility. Ratings were taken on a plot basis.
The distribution of MDM virus in Kentucky as confirmed by mechanical trans-
mission studies appears in Fig. 1. Samples of diseased corn having symptoms of virus
injury, received by the Plant Diagnostic Laboratory, Department of Plant Pathology, from
..3...

 corn producers and county extension agents, were the source for the mechanical .
transmission studies. All mechanical transmission tests on wheat were negative.
No estimates of disease severity, extent of affected area in each county, or loss in
production can be made. A
FIC. 1. ——DISTRIBUTION OF MDM VIRUS IN KENTUCKY IN 1965, CONFIRMED BY MECHANICAL TRANSMISSION.
A summary of agronomic data recorded on commercial hybrids entered in the V `
Kentucky Hybrid Corn Performance Test and evaluated under MDM virus conditions
is in Table 1. The hybrids are ranked in order of increasing susceptibility within
endosperm color groups. Data on experimental hybrids from the University of
Kentucky and from industry are summarized in Tables 2 and 4. The pedigrees of .
the University of Kentucky experimental hybrids are listed in Table 3. The relation- ,
ship of the MDM virus rating and the yield in pounds per acre in each of the seven
replicated virus experiments is summarized in Table 5. A striking relationship exists
between the MDM virus rating and yield. A similar relation exists between virus
rating and standing ability. 4-
Agronomic data from a diallel set of yellow single crosses is summarized in y
Tables 6, 7 and 8. With the exception of inbred Ky 36-11 a close relationship exists
between the rating of inbred lines per se and in single cross combinations.
Average MDM virus ratings of inbred lines evaluated at Vanceburg and
Frankfort, Ky. , are summarized in Table 9. »
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 Table 9. -·- Summary of M. D. M. Virus Ratings of Inbred Lines
M. D. M. M. D. M.
Virus Virus
Ighged Rating Inbred Rating ‘
Ky 221 1. 0 CI 21E (Ky) 5. 5
N 7B 1. 5 Ky 108 5. 8
Ky 997-3-2-2-1 1. 7 T 101 5. 8
Ky 997-4-1-3-1 1. 8 Ky 997-16-2-2-2 5. 8
Ky 997-10-1-1 2. O Ky 4339-23R4 5. 8 _ .
Ky 998-11-2-1 2. 0 Ky 4339-88R4 5. 8
Ky 5104-58R3 2.0 33-16 (Ky) 6. 0
Ky 997-4-1-3-1 2. 5 Ia 63:1261 6. 0
Ky 226 2.5 Ky 39 6. 0
Ky 128 2. 7 Ky 217 6. 0
Oh7B 2. 8 Ky 59-3617