General Information
Macro-Infusion with Arbotect has
been proven to give 90% - 95% protection from Sycamore Anthracnose
for 3 years when the protocol is followed. The purpose of macro-infusion
is to evenly and completely cover the entire internal crown of the
tree with enough Arbotect to keep the disease out. This can only be
accomplished when the material is applied to the root flares.
 The
tree on the left was treated with Macro-Infusion using Arbotect.
The tree on the right is untreated.
Photo courtesy of
Bartlett Research Lab
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For trees up to 25” diameter - For trees larger than 25” diameter
a larger dose will be needed to achieve effective control. Complete
crown coverage of enough Arbotect to protect all the 1 - 2 year old
twigs is essential for protection. Crown size is not a linear relationship
to trunk diameter. See Dosing Considerations for more information.
Expectations of Results - In the first season after treatment
the tree will still exhibit Sycamore Anthracnose leaf infection symptoms.
This can include blotched leaves and even some defoliation. However,
Arbotect will prevent new Sycamore Anthracnose twig cankers from forming
and in the 2nd season after treatment, there will be a significant
reduction in leaf blotching. In the 3rd season following treatment,
the tree will have further significant reduction in leaf blotching
and defoliation. By re-treatment of the tree every 3 years, protection
will be maintained.
Why Does The Treatment Take Time To Be Effective? Sycamore
Anthracnose lives in the 1-2 year old twigs of the tree. Arbotect
works by preventing new infections in these 1-2 year old twigs. Arbotect
does not kill existing infections in the tree, nor does it protect
the leaves. Thus, the fungus in the treated tree will still reproduce
spores which can affect the leaves the first year after treatment.
Because Arbotect does prevent the Sycamore Anthracnose fungus from
growing from the leaves into the twigs, re-infection of the tree will
be prevented and a reduction of symptoms will take place in subsequent
years.
Treatment Timing - Trees should be treated when the canopy
is in full leaf. In many years when Sycamore anthracnose is severe,
the treatment is best applied later in summer after the trees have
refoliated from the infection. Treatment can be administered until
there is fall color present in the canopy.
Expectations for Uptake - Sycamores may take slightly longer
to Macro-Infuse with Arbotect than elms. Average uptake time should
be between 1-1.5 hrs. If treatment time is longer than this, please
make sure you are following the macro-infusion guidelines or contact
Rainbow Treecare Scientific Advancements at 1-877-ARBORIST for
technical support.
Other Sycamore Diseases - There are other disease and insect
problems that also affect Sycamores that must be diagnosed and treated.
Issues such as scale insects, powdery mildew, and bacterial leaf scorch
will need to be taken into consideration when developing a tree health
program.
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