Sierra Tree and Fungi

Sierra Tree and Fungi ISA Certified Arborist providing tree healthcare, arborist reports, and plant pathology diagnostics. https://www.sierratreeandfungi.com

06/02/2026

Do you know the #1 thing ignored by arborist?

Roots.

So many times issues with the canopy are observed they are directly linked to root issues, like root pathogens, soil compaction, construction damage, etc.

Using an air spade to remove the soil while leaving roots intact helps tree health professionals inspect the roots and root crown to look for signs of these greater issues. This Interior Live Oaks (Quercus wislizeni) roots looked great. We amended the backfill soil with compost, beneficial microbes including my locally collected ectomycorrhizal fungi, and apply mulch on top.

Thanks to Kyle at Ascendant Tree Care for letting me play with his arborist toys. 🌲

I love reading the stories trees tell. This old, though not especially large Quercus kelloggii (California Black Oak) in...
05/26/2026

I love reading the stories trees tell.

This old, though not especially large Quercus kelloggii (California Black Oak) in the Eldorado National Forest has some different things going one that are notable.

1) It has a lightening scar (the gray spiral around the bark) going up the trunk and it shows it wrapped up a now dead and failed stem. What’s unique about this up here in the Sierra Nevada mountains is we rarely see California Black Oaks with lightening scars as they are rarely the tallest tree in the forest. The other tree species in this area were Ponderosa Pine, Jeffery Pine, White Fir and Incense Cedar all have maximum heights well above that while the Black Oak can achieve.
What made the Black Oak stand out? It’s on the edge of a large open slope of granite and shrubs. Trees on the edge of a meadow or lake are more prone to lightening strikes. Also some trees are more prone to lightening strikes than others.

2) You can also see what looks like a white spot at the base of the tree. This is actually old Laetiporus gilbertsonii, Aka Chicken of the Woods. When the fruiting body is old it becomes crumbled and looks like styrofoam. This causes a brown heart rot, which, given the location of the fruiting body, is likely decaying the base and/or roots.

I love when trees like this are located in natural setting like this away from infrastructure because if this tree falls is highly unlikely impact people, so it can be left become an ancient tree in peace.

I could write a book about what’s wrong here, but let’s talk about PLANT HORMONES today and how hacking your tree change...
05/19/2026

I could write a book about what’s wrong here, but let’s talk about PLANT HORMONES today and how hacking your tree changes its hormone balance.

1) Auxin is created almost only in the apical meristem (shoot tips) of branches. It is both key is trees growing taller, branches growing longer, and it promotes root growth. It is also the reason why trees grow towards sunlight. When one side of the tree gets more sun than the other, the more shaded side creates more Auxin. The shaded part grows longer than the side with more sun, causing the tree to bend towards the light.
When you remove almost all shoot tips of a tree like this, Auxin production drastically drops. Since this hormone also helps keeps latent buds on the stem dormant, their dormant days are over. Butchering a tree’s canopy causes drastic shift in plant hormones in the tree.

2) Cytokinins are the second part of this drama unfolding in this picture. Cytokinins are produced by root tips and move up the canopy via the xylem to the canopy where they stimulate latent buds to produce lateral growth. They also stimulate plant cell division and was first discovered in coconut milk. Auxin normally keeps a balance with Cytokinins, but without Auxin present Cytokinins call all the shots and they set all those let buds free to become epicormic sprouts. These are the clusters of leaves you see emerging on the bare branches.

The one of the highest benchmark of arborist knowledge is the ISA Board Certified Master Arborist Test. There are less t...
05/09/2026

The one of the highest benchmark of arborist knowledge is the ISA Board Certified Master Arborist Test. There are less than 50 BCMAs in California.

Purple plum trees (Prunus cerasifera) in urban landscapes often host a single white rot decay fungi, Phellinus pomaceoid...
05/09/2026

Purple plum trees (Prunus cerasifera) in urban landscapes often host a single white rot decay fungi, Phellinus pomaceoides (formerly P. pomeceus). This tree was exhibiting gummosis around the fruiting bodies present on the trunk.

05/05/2026

The hidden world of the Hidden Pore Fungus

05/04/2026

Every where I go I am looking at trees and mushrooms. I’d love to assess your trees and help come up with a plan to better care for your trees.

04/21/2026

Don’t kill your tree! 3 tips from best management practices for planting trees in heavy clay soil

New blog post for morel season
04/18/2026

New blog post for morel season

How are morels and trees linked.. its complicated

Just added a list of some of my favorite tree books, what’s your favorite?
04/09/2026

Just added a list of some of my favorite tree books, what’s your favorite?

Favorite Tree Books Tree Identification GuidesTrees of the California Landscape by Charles HatchCalifornia Trees by Matt Ritter and Michael Kauffman Trees and Shrubs of California by John D. StewartTrees and Shrubs of Nevada and Placer County by Redbud Chapter California Native Plant SocietyConifers...

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Placerville, CA
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