Texas Pecan Pest Management Newsletter, Volume 92, Number 2, April 1992 Page: INSIDE FRONT COVER
4 p. : ill. ; 28 cm.View a full description of this periodical.
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There have been some changes
in the pecan fungicide labels
since 1991. Duter* is no longer
available. Super Tin 4L is the
only formulation of triphenyltin
hydroxide available for use on
pecans. The label has been
changed to include the
requirement that the tractor
used to pull the sprayer have
an enclosed cab.
Benomyl fungicide sold as
Benlate* will be available for
the 1992 growing season.
However, only the wettable
formulation will be on the
market. Benlate should be
used as one of the fungicides in
control of pecan diseases. To
reduce the possibility of
fungicide resistant races from
developing, it should not be
used exclusively. Benlate has
the advantage of being
approved for use where cattle
are grazing. It is the most
effective material that is
approved for use in
cattle/pecan operations.
Thiophanate methyl fungicides
are available as Topsin Ma
70WP. Topsin M 85 WDG
and Topsin M 4.5F. They are
similar to Benlates in activity.
Like Benlate*, repeated use of
any of the products can result
in fungicide resistant races of
the pecan scab fungus. It is
not approved for use in
cattle/pecan operations.
Thiophanate methyl fungicides
or benomyl containing
fungicides are recommended
for use around the home
landscape. Both fungicides are
approved for use on most fruit
crops. Benomyl materials are
approved on a wide variety of
vegetables but is not currently
labeled for use on ornamental
plants. Thiophanate methyl
fungicides are approved on alimited number of vegetables
but are approved for use on
ornamental.
Propiconazole is sold as
Orbital. It is one of the most
effective materials approved for
use on pecans. It has shown
good activity against the pecan
scab fungus and has a good
level of activity against the
downy spot fungus and also
organisms associated with
fungal leaf scorch. It is
suggested for use only on
commercial plantings. The
tractor used to pull the sprayer
must have an enclosed cab to
protect the applicator from
drift. It is not approved for use
in areas where cattle are
grazed.
Syllita 65W is a new name for
an old fungicide. The chemical
is known as dodine and was
once sold as Cyprexa 65W. It
does not have a grazing label.
The product is used in the
Southeast due to the
development of races of the
pecan scab fungus that are
resistant to the benzimidazole
fungicides, Benlatea and
Topsin Ma. Any one using the
product should read the label
carefully. Dodine applied as a
tank mix with some of the
insecticides used on pecans can
cause foliage burn.
Zirama contains zinc as part of
the active ingredient. Use of
this product has resulted in a
higher zinc level in the foliage.
Nuts from trees sprayed with
this product are sometimes
larger than those from trees
sprayed with other fungicides.
Zirama does not have the same
level of activity against the
scab fungus as some of the
other fungicides. It should be
used in the mid summer sprayprogram when disease pressure
is not great. It can be used on
varieties that have a good level
of resistance to the scab fungus
or in the more western
production areas where scab is
not as severe a problem. It is
not suggested for use if the
applicator will be exposed to
excessive drift. It causes a
temporary burning of the skin.
It does not have a grazing
restriction.
Basicopais a copper sulfate
containing fungicide that is
approved for use on pecans. It
is a product that should be used
in areas of low disease pressure
or on varieties that have a good
level of resistance to the scab
fungus. It can be used in areas
where cattle are grazed. Texas
Department of Agriculture
restrictions allow the use of
copper sulfate fungicides on
products that are sold as
organically grown, there is a
possibility that pecans sprayed
with this product can be
considered organically grown.
It should not be used in areas
where scab is a major problem
or on varieties that have little
or no resistance to the fungus.
Before using any fungicide be
sure to read the label carefully.
Intervals between sprays should
be followed as will as the rate
per acre. 1991 was a bad year
for scab due to above normal
rainfall during the growing
season. 1992 is starting off
similar to 1991 and could be an
even worse year for scab.
Disease inoculum level is much
higher than normal in many
orchards. Early season
applications will have a major
impact on pecan scab severity.
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Texas Agricultural Extension Service. Texas Pecan Pest Management Newsletter, Volume 92, Number 2, April 1992, periodical, April 8, 1992; College Station, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1624303/m1/2/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.