xt79p843sf7x https://exploreuk.uky.edu/dips/xt79p843sf7x/data/mets.xml   Kentucky Agricultural Experiment Station.  journals kaes_circulars_004_607 English Lexington : The Service, 1913-1958. Contact the Special Collections Research Center for information regarding rights and use of this collection. Kentucky Agricultural Experiment Station Circular (Kentucky Agricultural Experiment Station) n. 607 text Circular (Kentucky Agricultural Experiment Station) n. 607  2014 true xt79p843sf7x section xt79p843sf7x “   W W   JW  ’
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Fig. 5.— Physiological spotting in L8.
‘* \V. D. Valleau and el al. Kentucky Agricultural Experiment Station Bulletin
592, lf.rpcricnce.s· with Control of Black Shank of 'I`obr1cco in 1952. (University of
Kentucky, Lexington, 1952), pp. 13-14.
10

 comes so severe that the leaves are destroyed before harvest. How-
ever, the F] hybrids of this line with standard varieties have proved
· to be highly resistant to black shank and are usually, relatively free
b from the physiological spot. Farmers have grown F, hybrids (LS x
standard varieties) in heavily infested soil with complete satisfaction
to yield, quality, and freedom from black shank. Race O, the common
race of the black shank fungus in Kentucky, will not infect hybrids
which have L8 as one of the parents. However, the F] hybrids be-
tween LS and standard varieties are not resistant to Race 1.
_ The burley tobacco varieties (Burley 37, 11 A, 11 B, and 49) cur-
rently being grown are moderately resistant to both races of the black
shank fungus (Fig. 3 and Table 2). This type of resistance will give
. satisfactory control when used in rotation. However, when these
varieties are grown in a field where losses of a susceptible variety have
been heavy they may also suffer losses. In moderately infested fields
losses with these resistant varieties have been very limited. For a
better understanding of the relative resistance of each variety see
Table 2.
Table 2.- Relative Resistance of Black Shank Varieties to Race 0 and Race l.
 
Variety Black Fusarium
Race 0 Race 1 Root Rot \Vi[t
i   lligh
Burley 11 B Medium Medium Low lligh
Burley 37 Medium Medium Low Low
Burley 49 Medium Medium lligh Low
Burley 37 x L8 Iligh Low-Med. Low None
Burley 21 x L8 lligh None Low-Med. None
Kentucky 12 x L8 lligh None Medium Med.-lligh
Use of Resistant Varieties or Hybrids in Control of Black Shank
If you can’t control black shank through crop rotations, plant your
field in a variety moderately resistant to both races such as burley
37, 11 A, 11 B, or 49. To identify the race you have, plant a stick row
of one of the hybrids, Ky 12 x L8 or Burley 21 x LS. lf the hybrids
in your stick row donit become diseased, you have Race O and you can
plant the next crop in a hybrid. But if any of the plants are infected,
Race 1 is present. As stated earlier, L8 is completely susceptible to
Race 1, and you’ll have to continue growing one of the standard
varieties.
Don`t use the hybrid, Burley 37 x L8, for a stick row test because it
has only “low-medium" resistance to Race 1, and this hybrid will not
give a true test unless the field is heavily infested.
11

 Grow the Burley 37 x L8 hybrid only in fields where you know
that Race 0 exists. This is important because the Burley resistance ‘
has been reduced by one-half in making the hybrid, and one-half of ,
this resistance is not enough to withstand a high population of Race 1.
If black shank can neither be controlled by the standard resistant
varieties nor the L8 resistant hybrids, then you should not attempt to
grow tobacco in that field for at least 3 years. Upon returning to the
field with tobacco, plant Burley 37, 11 A, 11 B, or 49, for the L8 re-
sistant hybrids may not give control in this Held. _ g
You may want to grow one of the hybrids because they are resistant
to more diseases. For example, Ky 12 x L8 is resistant to the major
diseases; mosaic, fusarium wilt, black root rot, wildfire, and black ·
shank.
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