TR-2022-051 - Arborist ReportCommunity Development Department
Planning Division — Cupertino
CUPERTINO APPROVED
Case # TR-2022-05ban To-sesifree Service
Application Number(s)'
ARBORIST_
Approva I Body: Director / Staff
Approval Date 11/29/22 Arborist Report
Signature Catherine Tarone
Prepared bye Manager
Certified Arborist: Robert Apolinar
#W E-8846A
P.O box 8552 San Jose, Ca 95155
(408) 422-1313
Email: robert@san*osetreemaintenance.com
SanJoseTreeMaintenance.com
Prepared for:
Grace Lu
10300 Phar lap Dr Cupertino
408-858-4816
August 25, 2022
Assignment
San Jose Tree Service has been contracted to assess the health of a tree. An assessment was
performed on tree, the following report will provide the observations of the assessment. The
assessment was performed by Certified Arborist Robert Apolinar #WE-8846A.
Observations -
There are 3 mature Live oak trees on site. The site is sloped. The home and landscape appear to have
been built around the trees. A root crown excavation was performed on all three trees to inspect their
root systems. Oak root fungus was located on one tree but all the others do not have any signs of it. The
one with root rot should be removed right away due to the extent of root decay and the risk of it falling
over at any time. The following report will identify the condition of the one live oak that should be
removed due to root rot.
2
Community Development Department
Planning Division — Cupertino
CUPERTINO APPROVED
Case # TR-2022-051
Approval Body: Director / Staff
Approva I TDa4f�ymifolia
i3M
Signature Heiftthwi�%Tvrone
Spread: 30-40sftMa nager
Tree
Pruning History:
The appears to have been last pruned within 10 years. Crown thinning was performed.
Leaves and twigs:
The leaves and twigs appear to be healthy. The tree is vigorous and lush.
Crown and branches:
The tree leans heavily towards the neighbor's property because it is growing under a larger oak. The tree
is growing over into the neighbor's property at a lean. There are no apparent structural issues in the
upper canopy.
Trunk:
The entire root crown and upper 12-18" of trunk is buried in soil. As a result, the trunk has been infected
with Armillaria root rot and the bark is beginning to fall off in several areas. Mycelial fans are present
underneath the bark and the white rot has spread throughout the wood. The wood is already beginning
to deteriorate and loose structural stability. Approximately 90% of the root crown has been infected.
The majority of the anchoring roots are decayed and the structural integrity of the tree is compromised.
It poses a threat to the residents and is considered and hazard. Due to its instability, it could fail at any
time.
Roots and root crown:
The roots and root crown are in poor condition and pose a major hazard to the residents. Armillaria root
rot has been located in the lower root crown and major roots. The fungus has progressed and the
majority of the wood in the root crown has been affected. He major roots and root crown have major
rot as a result. this stage the tree is losing its structural integrity and should be removed as soon as
possible.
Health Assessment:
The tree foliage is in good condition but the roots and root crown are failing rapidly.
Recommendation:
The tree should be removed as soon as possible due to the rapid failure of the root system. There is no
cure for the disease and the tree is liable to fall at as it progresses.
Armillaria description
Community Development Department
AftlWJMgoDr1 rMii51qarUphftM1ic gnized by the presence of light brown mushrooms (known as
CUPERTINO "honey muslxrw��c �IDto their color; not their taste!), which typically appear in a cluster of several to
dozens It
m the base of infected trees or shrubs. Sometimes the mushroom cluster will
Case # nr;rp fro ►, a b irfarass or aroundcover area away from the infected tree (or where an
infecte&PlnW8?0uR8P0 or will form around an old stump. Mushrooms may not always appear, and
Approva I Bry &irec IrsYrSc * to the disease without ever giving rise to mushrooms. Therefore, it is better to
look for �t�r��re consistent, signs of the fungus.
Approva I Date
Signature OneCch#rigid_atanef Armillaria root rot is the white fan -shaped mycelia, thin, flat sheets of fungal
tissue (mycE%M" at grow just below the bark. To find these mycelial fans, select a dead or dying
plant to examine. Dig into the soil at the base of the trunk and down to approximately 12 to 18 inches
beneath soil line. From the trunk and any large roots branching off the trunk, peel or cut away the dead
bark with a knife to reveal mycelial fans and rotted wood, a common symptom of Armillaria root rot.
Damage:
The first and most obvious symptom of Armillaria root rot may be decline or death of a tree or woody
plant. Often, death occurs so rapidly that the leaves turn brown, but don't yet fall off the tree.
Sometimes this decline may be slower, characterized by dieback of shoot tips over the course of months
or even years. Armillaria infects woody plants and destroys their vascular cambium and the underlying
root wood.
After the cambium has been killed and the underlying root wood has been invaded, a mycelial fan
usually grows to colonize the main stem, where it may continue to invade other roots or move up and
around the root collar. Where the cambium of the main stem or large roots has been destroyed by the
fungus, the formation of new wood and bark ceases, and a flat lesion on the surface of the bark (visible
as an external canker) develops —these are the best places to look for mycelial fans under the bark,
especially on trees that have canopy symptoms.
PUBLICATION INFORMATION
UCRPEER
REVIEWED
Pest Notes: Armillaria Root Rot
UC ANR Publication 74171 Downiaad PDF
AUTHORS: A. James Downer, UCCE Ventura County, Igor Lacan, UCCE San Mateo and San Francisco
Counties
4
Community Development Department
Planning Division — Cupertino
CUPERTINO APPROVED Replacement Trees
The new e I I e nted to replace the diseased oak tree.
Case # _ �yAF,� ntPrl aarh ox containers
Tree sp&iftption Number(s)
Acer ma r h.�llum
Approval Body: Director i o�a
alifornica
Approva I ees r„, ?do
r rw
Signature
Catherine Tarone
Case Manager
Certified Arborist Credentials
Certified Arborist #WE-8846A
Qualified Tree Risk Assessor
Robert Apolinar
5
Community Development Department
Planning Division — Cupertino
CUPERTINO Site Plan: APPROVED
Case # TR-2022-051
Application Number(s)
Approval Body: Director / Staff
Approva I Date
Signature
11 /29/22
Catherine Tarone
Case Manager
(Replacement trees in Yellow)
Acer macrophylum
Planter bed near driveway
Aesculus
californica
Phar Lap dr
Park Strip Planter
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