(Continued from Page A36>
with 38-inch centers that align
with the plant rows, Fleming
replaced the flat spray pattern noz
zles with nozzels that create a hol
low cone pattern.
Between the top sprayers set on
38-inch centers, they added
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15-inch drop arms (which made
the sprayer have 19-inch centers).
Except for the end drop arms,
each drop arm was fitted with a
two-head “T” with cone nozzels.
The drop arms travel between
the plants and spray into the sides
of the plant
The cone shape of the spray pro-
im
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vides two edges from top to bottom
to dispense the liquid.
The plant gets hit with the fust
edge of the cone as the sprayer
travels down the rows, and again
with the back edge of the cone as is
passes by the plant.
Adaquate pressure is needed to
ensure a proper spray mist to form,
and Flemming, who demonstrated
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the boom sprayer and discussed
sprayer considerations, said that
with the high pressures required,
that a high percentage of the spray
er pump’s power rating can be
used up in achieving the proper
spray and rate of flow.
Since both are wettable pow
ders, they need to have constant
agitation in the tank.
He said that, considering the
slow rate of travel in the Held with
the sprayer in order to achieve
adequate coverage of the plant, as
well as the reduction in turbulance
in the tank caused by the high pres
sure load on the pump, that farmers
should consider stopping occa
sionally to allow proper agitation.
The advice to spray once per
week was a general recommenda
tion because, if the weather returns
Pal t B
RD 2 Box 271
East Earl, PA 17519
(717) 354-0584
Lancaster Fanning, Saturday, July 5, IM7-A37
Acrobat MZ requires a drying time of three
hours before rain in order to stick to the plant.
If rain is forcast for the evening, and there is
apparently time to apply it before it starts,
Fleming said to go ahead.
As a caveat however, he did recommend
waiting until the spraying conditions were
appropriate low wind, plant dried off from
morning dew, etc.
The officials answered specific questions
from some members of the group.
One grower asked if aphid control insecti
cide could be mixed, in order to reduce the
number of trips through the field.
With the emergency use of Acrobat MZ, it
cannot be mixed with any other agent or
chemical, other than water, Orthene or Thia
dan. That includes fertilizers and adherhents
(“stickers”).
Dithane DF can also be mixed with
Orthene or Thiadan.
Furbane had been labeled for use and is still
labeled, and is recommended in seed beds, but
the Dithane DF and Acrobat MZ perform bet
ter in the fields.
The special use of Acrobat MZ is limited to
a total of 10 pounds per acre. Further, Fleming
said that stocks of Acrobat MZ may be lim
ited, though he said he is not saying that to
create a rush on purchasing it.
While half pound per acre applications of
Acrobat MZ are suggested for young plants,
2.5 pounds per acre are recommended when
the plant matures.
Since frequent applications of Acrobat MZ
could possibly result in reaching the
10-pound per acre limit before the plant is
topped, it was suggested that using both fun
gicides alternately may help in managing the
disease while staying in compliance with
restrictions.
The decision of when to use either should
be made depending on weather conditions
and how that relates to the mold-and its active
spore formation.
Acrobat MZ stops sporulation, while
Dithane DF does not.
New leaves that appear on plants since the
last spraying are not protected. They need to
be sprayed.
There is also a 30-day harvest restriction on
the fungicides.
However, Yocum said that, for reasons not
yet understood, once the tobacco plant is
topped, the blue mold ceases its damage and is
no longer of concern, even though it’s in the
plant.
Fanners were also asked to destroy the
plant beds as soon as transplanting has been
finished. Plowing or discing was recom
meded. All plants in the bed have to be killed
to stop the blue mold.
(Since blue mold does not overwinter, seed
and plant beds with blue mold this year will
not be contaminated next year and can be used
without fear.)
If there is blue mold visible in the beds, it is
giving off spores and can be a source for
spreading the disease into fields. If sporula
tion conditions are present. Acrobat MZ can
be used to stop the spore-producing activity.
The blue mold apparently is not confined to
Lancaster County, and Lebanon County crops
agent Delbert Voight said he had discovered it
in some farmers’ fields, but had not been
aware that it was the resistant variety and that
Ridomil would be ineffective.
Gold Spontor
For more information, contact a local Penn
State Extension office or a certified
to the 90s and is hot and dry, the
mold may become somewhat dor
mant That could perhaps extend
the interval between spraying by
up to 10 days or possibly two
weeks.
However, weather is the deter
mining factor.
Both Acrobat MZ and Dithane
DF have to be reapplied after a
heavy rain. They will wash off,
though it has to be a hard rain.
Acrobat MZ will stay longer if
allowed to dry properly. If also
allowed to dry first Dithane DF
will also not wash off
immediately.
In making a decision to spray
before a rain of afterward, it was
recommended that spraying
should precede the rain, because
the storm that brings the rain
brings the mold spores.