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Detecting Hollow Trees: Resistograph and Increment Borer

Professional Decay Assessment Tools

Arborists use Resistograph (measures wood resistance) or increment borer (extracts core) to detect hollows/decay. Tree radar also available. Certified ISA arborists provide reliable assessments.

Trees: Cottonwood Seedlings: Transplant Only If Seed-Grown, Not Root Suckers; Fig Tree Planting Guide for Alabama; Diagnosing Two Problem Trees: Borer and Canker; Cherry Tree Growth Rate and Fast-Growing Alternatives; Planting Balled-and-Burlapped Trees: Remove the Wire and Burlap!; Seed-Grown Apple Tree: 10-Year Wait for Fruit; Paulownia for Albuquerque Shade: Fast but Considerations; Fall Webworms in Arkansas: Silken Nests, Minor Damage; Estimating the Age of Large Oak Trees Without Cutting Them; Best Indoor Trees for a Warm Greenhouse in New York

Garden Articles

Identifying and Managing Slime Flux (Bacterial Wetwood) in Mature Cottonwoods

Maple Tree Cauliflower Fungus: Conk Indicates Internal Decay

Redwood Top Dieback: Internal Decay, Monitor for Hazard

Old Tree Trunk Damage with Decay: Not Deer, Likely Past Wound Leading to Structural Hazard

Is a Hollow Tree a Dead Tree? Understanding Heartwood Decay and Structural Risk

Leyland Cypress Topping: Bad for Trees, Negotiate Removal Instead

Tree Nutrition and Bark Beetle Management in Arizona: Fertilization vs. Injection

Plants

Persimmon Seedling Timeline: Fruiting Age and Pollination Biology

Why Wild Persimmon Trees Don't Fruit: Sex Ratio

Trimming and Re-rooting Indoor Yucca (or Dracaena) Trees

Propagating Sycamore: Seeds Work, Cuttings Don't

Why a Bearss Lime Tree Won't Bloom

Pruning a Leggy Rubber Tree (Ficus elastica) for Bushier Growth

Mini Trees for Florida: Conifers, Palms & Flowering Shrubs