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Oak Wilt

Oak wilt is a lethal fungal disease that plugs the water conducting system in an oak tree. It can occur in all species of oak, but will very quickly kill red oaks.

Prompt diagnosis is crucial. The primary symptom is wilting of the leaves and early defoliation. In the red oak group wilting generally progresses from the top of the canopy downward. In white & bur oaks, wilting may occur on branches scattered throughout the tree. These symptoms may also be cause by anthracnose, bur oak blight or two-lined chestnut borer. Laboratory testing may be needed to confirm oak wilt.

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To Be Green Again

Certified Arborist MN-0324A

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Prescribed Fertilization Can Help Your Trees Now!

by Anthony C. Arnoldi, Board-Certified Master Arborist WI-0102B
Trees have had their share of problems:  necessary elements for growth, defense, replacement
• They have suffered from thinning root systems during leaves or roots and compensating for environmental
the last five years of the accumulating drought stresses.
• Boring insects have risen to extremely high levels and • Root biostimulant and humates option for tree fertil-
are attacking various species. ization. This more “green” approach enables the roots
• Chlorosis has begun or intensified on susceptible trees to be targeted. This is often necessary to compensate
• Needle diseases and needle drop of evergreens are for drought, construction damage or root rot. It is
commonly visible. invaluable in assisting trees without stimulating root
• Fungal leaf diseases of deciduous trees are causing rot, shoot blight or other diseases. It is indispensable
defoliation. in encouraging newly planted trees to become estab-
• Root rots have affected many root systems. lished, especially in our difficult, clay-based soils.
• Dieback and decline has started on many trees • Mixing root biostimulant combinations with varying
All of these are working in varying combinations to leave levels of complete fertilizer. This provides for special
our trees stressed and vulnerable to further insect and disease applications and requirements based on the tree con-
attack. Some are not ready to endure another long winter. dition and insects and/or diseases present.
Fertilization is one of the most powerful tools arborists • Chelated iron, or manganese alone, or as an inclusion
have at their disposal to help trees recover from stress to fertilization, can help to fight or prevent chlorosis or
and damage. It is often necessary to help trees by controlling micronutrient deficiency.
insect or disease attack but as far as providing aid that actu- Your Certified Arborist is best qualified to choose the
ally improves tree health; fertilization is the cornerstone. right options and combinations to design the program tai-
Several options in fertilizer formulation enhance our abil- lored for your specific situation. Fall is the perfect time to
ity to help your trees recover and avoid potential problems: fertilize because roots naturally peak their growth as the
• Polymer-based nitrogen in a specially balanced com- leaves shut down for the year. Fall fertilization can enhance
plete fertilizer. This allows us unmatched control with this peak and promote greater pick up of the soil-injected
slow release for an entire year without “pushing” the materials. This will better prepare your tree for a long winter
tree or stimulating unwanted growth. It provides the and help it to be able to successfully “wake up” next spring!

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