Plant health care is the diagnosis and management of the pests, pathogens, and stresses that affect a tree's health, with treatment prescribed only after the cause is identified. I am Christopher Hodge, an ISA Board Certified Master Arborist, TCIA Plant Health Care Technician, and California licensed Qualified Applicator, and I diagnose before I treat. Independent consulting practice, no removal crews, no incentive to sell you treatments you do not need.
Bark beetles and wood boring insects
In the Sierra foothills and Sacramento region, bark beetles are among the most lethal tree pests, especially on drought stressed conifers. The western pine beetle and engraver (Ips) beetles attack ponderosa and other pines, and the fir engraver attacks white fir. On oaks, the invasive Mediterranean oak borer, an ambrosia beetle, now threatens valley oaks in El Dorado and Sacramento counties. Warning signs include pitch tubes on the bark, reddish boring dust called frass in bark crevices, fading or reddening crowns, and heavy woodpecker activity. Once beetles are established under the bark, options are limited, so the real defense is keeping trees healthy and, for high value trees, applying preventive treatment before an attack.
Pathogens and tree diseases
Fungal and other pathogens cause root rots such as Armillaria and Heterobasidion, along with cankers, vascular wilts, and foliar diseases. Many of these look alike, so I confirm the organism in the field and under the microscope before recommending anything, because the response to an aggressive pathogen is completely different from leaving a harmless or beneficial fungus alone. Correct identification is the whole point, and it is where my fungal pathology work and a plant health care plan meet.
Insect and pest issues
Beyond bark beetles, trees face aphids, scale, mites, flatheaded and roundheaded borers, and defoliating caterpillars. Most of these are cosmetic and resolve on their own, while a few cause real harm. I identify the pest, judge whether it actually threatens the tree, and use integrated pest management: cultural fixes first, and targeted treatment only when the diagnosis warrants it.
My approach: diagnose, then treat
I do not spray on a schedule or treat by guesswork. I diagnose the cause, correct the underlying stress through water, soil, and root zone management, and apply a targeted treatment only when the evidence supports it. As a California licensed Qualified Applicator I can recommend and apply control materials responsibly, but the goal is always the least intervention that solves the problem. Because I run no removal crews, my advice is based on the tree, not on selling work.
Frequently Asked Questions
What are the signs of bark beetles in my tree?
Look for pitch tubes on the trunk, fine reddish boring dust (frass) in bark crevices and at the base, a crown that is fading, thinning, or turning red, and a sudden increase in woodpecker activity stripping the bark. On conifers these signs often appear after drought. Bark beetles move fast once established, so an early assessment matters.
Can you treat my tree's disease?
Sometimes, and it depends entirely on the disease and how far it has progressed. The first step is always an accurate diagnosis, because some pathogens are treatable with cultural changes or targeted materials, some are managed only by reducing stress, and some cannot be cured once advanced. I tell you honestly which situation you are in.
Do you spray pesticides on a schedule?
No. I practice prescriptive plant health care, not calendar spraying. I diagnose the specific problem, address the cause, and use a targeted, licensed treatment only when it is genuinely warranted. That protects beneficial insects and fungi and keeps unnecessary chemicals off your property.
Sources
- UC Statewide Integrated Pest Management Program (UC Agriculture and Natural Resources) and the USDA Forest Service, for forest insect and disease guidance.