The Vegetation Clearance Blog

GO 95 names no tree defect. Rule 31.1 sends the question to accepted good practice, which means the defect list is whichever one the utility's procedure adopts. What the published lists contain, what each defect has to be measured to, and which way each one drops the tree.

California's statewide Tree Mortality state of emergency, proclaimed October 30, 2015, was terminated March 24, 2026. The beetles outlived it. What still reaches a dead conifer over a conductor is one paragraph of GO 95 Rule 35, and it turns on actual knowledge.

The Coastal Pitch Canker Zone of Infestation was declared June 4, 1997 and covers all or parts of 21 counties. It sets no clearance and no cycle. What it authorizes is control of the movement, disposal and use of infected wood, which puts the disease in the chip truck rather than in the clearance table.

Sudden oak death produces two obligations for a line clearance program that live in two different codes. One is a hazard tree that can fail while the crown is still green. The other is a CDFA quarantine covering sixteen entire California counties, which decides where the chip truck can legally end its day. On January 1, 2027 the host list inside that quarantine is replaced by an APHIS document in which the asterisk means the opposite of what it means today.

Mediterranean oak borer attacks white oaks in Napa, Sonoma, Lake and five more Northern California counties, and in Napa County it starts in the branches high in the canopy rather than at the base. There is no declared Zone of Infestation. The only statewide instrument is a CDFA pest rating that reaches shipments of nursery stock and nothing a line clearance crew does.

Two ambrosia beetles and the Fusarium fungi they farm are inside 15.7 million acres of declared zone across eight Southern California counties. On 51 of the 66 confirmed California hosts the result is not a dead tree. It is a living tree that keeps producing dead limbs, which is the condition Rule 35's overhang provision is written around.

The goldspotted oak borer kills coast live, California black and canyon live oak from the lower six feet of the trunk, and the state has drawn a Zone of Infestation over nearly five million acres of four Southern California counties. What the inspector has to find is a hole four millimeters wide, and what the crew has to solve is what to do with the wood.

What California's noxious weed listing actually requires of a line clearance crew working French broom, why coyote brush is the plant an integrated vegetation management program is trying to grow, and what a Marin County cut-and-burn record from 1994 says about both.

Why the ceanothus in a utility corridor is usually a fuel and boundary problem rather than a clearance problem, what a hundred percent top kill actually kills, what fifteen years of a cleared corridor floor measured out to, and where a CPUC compliance report named California lilac.

Why the re-clear interval for manzanita is a subspecies-level question rather than a genus-level one, what a clipping study in the Siskiyous did to stem counts, what the mastication research found in the mulch, and where a federally listed manzanita sits under a PG&E line.

Why the rule that reaches chamise is the ten-foot pole firebreak rather than a clearance measured from the conductor, what a lignotuber does to the re-clear cycle, and how a chamise moisture reading became a data point in a de-energization decision.

Why directional pruning has nothing to aim at on a coast redwood, what the Forest Service says a trunk does after its crown is cut off, the A300 clause the species argues, and the 136 failure reports with no profile behind them.

Why the governing number for Douglas-fir is height against distance rather than clearance, what a basal fire scar does to the tree thirteen years later, and what the Dixie Fire investigation found had never been written down.

Coast live oak fails at the bottom of the tree. Forty percent of its 619 California failure reports are root failures and 80 percent of its trunk failures involve decay. The one coast live oak the CPUC has investigated at a conductor produced two GO 95 violations, on the strength of a wound eleven inches wide at ground level.

Valley oak has a published structural failure profile built from 251 reports, and it says the limb that comes down is live, large and unremarkable from the ground. Two CPUC investigations of valley oak limbs on 12 kV conductors produced no vegetation violation.

Why a mature gray pine forks, what the pull-test research does and does not say about that union, and why the one gray pine failure California documented at a conductor was a different mechanism with a date printed on it.

The one CPUC decision that names eucalyptus and what it made utilities file, the blue gum failure profile already sitting in a California database, the pruning month UC IPM asks for and the cycle that ignores it, and what a eucalyptus record has to carry after the chips are hauled.

What a paclobutrazol soil application is under California law, why the federal label carries a separate dosage table for rights-of-way, and the licensing, recommendation and county reporting chain a treatment starts that a trim never did.