With the cool, wet weather we've been having this Spring, tree diseases have been showing up more than usual this year. Pathogens like Anthracnose fungus thrive in this type of weather and tend to peter out when it gets warmer and drier, so their window to cause damage is a lot longer than usual.
For instance, Anthracnose might usually harm only a small portion of this London Plane tree, but this year it is almost entirely leafless, with small, stunted growth where there are leaves. You can also see witch's brooming, where the tree is pushing out new twigs around spots that were killed by the fungus.
- Ken Almstead, Arborist in Westchester and Riverdale
Friday, May 6, 2011
|Removing soil from the root flare of a buried White Oak|
in Pelham's Harmon Park.
Originally, Almstead was contracted by the town to prune this grove of White Oaks (a very valuable tree species, especially in maturity). When I discovered the soil compaction and deep burying of the root systems, I recommended that air spading be performed in order to improve the health and extend the lifespans of these specimen trees.
|An air spade uses pressurized air to remove soil while|
not causing harm to the root system of the tree
(or an utility lines that may run underground)
We also performed vertical mulching throughout the critical root zones of the trees (out to the edge of the canopies). We used the air spade again, but this time to dig 3" diameter holes 10" deep. The holes were spaced at 3 foot intervals throughout the root zones. This is a great way to reach the entire root system without tearing up a whole lawn!
|Adding compost and soil amendments to vertical |
mulching holes. These 10" deep holes allow us to
feed the extensive root systems of large trees
without removing large sections of grass.
This was discovered by me and recommended to be performed for preservation of these trees when we were contracted to prune the grove of primarily oaks throughout the park area, town hall, harmon park and memorial park.
- Ken Almstead, Arborist in Westchester and NYC
Posted by Almstead at 1:21 PM