Blue mold alert sounded at Maryland field day
COLLEGE PARK, Md. - Good
news and bad news shared the
podium on the afternoon program
during the University of
Maryland’s thirty-fourth annual
tobacco field day July 25. The
event was held at the university’s
tobacco research farm near Upper
Marlboro, operated by the
Maryland Agricultural Ex
periment Station.
On the bad news side, Dr. Ar
vydas P. Grybauskas, an Ex
tension plant pathologist in the
botany department of the
University of Maryland, an
nounced that six confirmed cases
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of blue mold disease have been
found during recent days in
southern Maryland tobacco fields.
The mold spores appear to have
been wind-carried from Mexico by
way of the Carolines. The fungal
disease has appeared in four of the
five southern Maryland tobacco
growing counties. Anne Arundel
county is the lone exception so far.
Blue mold outbreaks generally
are brought on by too much cool,
damp weather during the tobacco
growing season. The malady has
been a problem in plant beds for
some time. But it was first ob
served actively infesting Maryland
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tobacco fields in 1979.
Dr. Grybauskas urged tobacco
farmers to inspect their fields
thoroughly for evidence of blue
mold.
Because of depressed prices
during the tobacco market auction
season this spring, many farmers
have not treated their fields with
metalaxyl, a soil-incorporated
systemic fungicide. So the
potential exists for blue mold in
festation to reach epidemic
proportions this year in southern
Maryland, as it did in 1980 and
1981.
Grybauskas mentioned four
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Lancaster Farming, Saturday, August 11.1984-A33
possibilities for helping to keep the
blue mold disease in check;
Tobacco plants
maturity could be harvested
earlier than usual. The curing
process kills the blue mold fungus.
If you use metalaxyl in a pre
plant application, you can in
corporate additional systemic
fungicide now into the soil. Keep in
mind, however, that early-season
application plus current ap
plication should not exceed two
quarts per acre.
If you didn’t use the systemic
fungicide earlier, spray your
tobacco plants now with a
oline
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protectant, non-systemic fungicide
to provide a chemical barrier
which will prevent further in
festation of blue mold. Generic
names for such fungicides include
mancozeb, maneb plus zinc, and
zineb.
Hope for hot weather, with
both day and night temperatures
above 80 degrees F. Low humidity
also helps to hold blue mold spore
formation in check.
Highlighting the good news at
last week’s tobacco field day was
presentation of a $13,800 check to
agricultural administrators at the
University of Maryland by a
representative of the R.J.
Reynolds Tobacco Company of
Winston-Salem, N.C. The money
will be used for tobacco production
research.
Since 1977, Reynolds con
tributions to the University of
Maryland’s tobacco research and
education programs have totaled
$120,125. The company’s con
tributions to all U.S. Land-Grant
universities since 1962 for similar
purposes have exceeded $5.5
million.
Also on the good news ledger
were portions of a report by Dr. W.
Lamar Harris, director of the
Maryland Agricultural Ex
periment Station, headquartered
on the University of Maryland
campus at College Park.
Dr. Harris informed the group
that a new headquarters building
under construction at the tobacco
farm should be ready for oc
cupancy by late fall. The building
will provide office and laboratory
space for the experiment station’s
Southern Maryland Research and
Education Facility. Ground
breaking ceremonies were held
last March.
Dr. Claude G. McKee, tobacco
farm superintendent, reported that
attendance at this year’s field day
was about 400 persons down
slightly from previous years. A
depressed tobacco economy was
seen as a major reason for the
attendance dip on what otherwise
was a beautiful day for an outdoor
event of this kind.
A Canadian military blimp
circling over nearby Andrews Air
Force Base added interest to the
morning tours.
Two of the six stops on the
morning wagon tour of research
plots paid tribute to work done in
earlier years by Paul N. Winn, Jr.,
a former agricultural engineering
research worker at the University
of Maryland, who retired on May
31. Winn and his wife were present
at this year’s field day.
The tour stops which reviewed
Winn’s earlier work involved
harvest mechanization and
“Principles of Curing Maryland
Tobacco.”
At other tour stops, University of
Maryland agricultural research
workers presented up-to-date
information on sucker control
chemicals, herbicides for grass
control in tobacco fields, sludge,
and tobacco variety development.
Regarding sewage sludge, the
word still is “don’t use it on fields
where tobacco will be grown,”
admonished Dr. Charles L. Mulchi,
associate professor of agronomy at
the University of Maryland.
Dr. Mulchi cited research at the
University of Maryland’s plant
research, farm near Calverton
(Montgomery county). This
research showed that heavy
metals from sludge application
were still present in the soil
after 10 years in sufficient
quantity to cause a negative
quality impact on tobacco that was
planted in 1983.