Tree Disease & Insect Management

The symptoms often overlap—yellowing leaves, canopy dieback, premature leaf drop, and bark anomalies can all result from fungal pathogens, insect infestation, soil compaction, drought stress, or nutrient deficiency. Accurate diagnosis requires a trained arborist examining the full tree and site conditions, not just the visible symptoms. Townsend’s ISA Certified Arborists have the diagnostic skills to distinguish between these causes and recommend the correct treatment rather than guessing.

Central Indiana trees face a specific range of disease pressures. Oak wilt is a serious fungal pathogen affecting red and white oaks, spreading through root grafts and infected pruning wounds. Fire blight is prevalent in crabapples and ornamental pears. Anthracnose affects sycamores, oaks, and maples during wet springs. Bacterial leaf scorch affects oaks, maples, and other hardwoods in landscape settings. Dutch elm disease continues to threaten elm populations. Emerald ash borer, while technically an insect, causes vascular damage that functions like a systemic disease in unprotected ash trees.

A tree health assessment is a structured evaluation by a Tree Risk Assessment Qualified arborist. It includes visual examination of the crown, bark, root flare, and surrounding soil; identification of pest activity, disease symptoms, and structural deficiencies; and review of environmental stressors contributing to decline. Depending on findings, it may also involve soil testing, resistance drilling to assess internal decay, or root collar excavation to identify buried crown and girdling root issues. The result is a clear picture of what’s affecting the tree and what the options are.

Integrated pest management is a monitoring-and-response approach, not a spray schedule. Standard treatments apply products on a fixed calendar regardless of whether pest populations are actually at damaging levels. IPM uses regular inspections to determine if, when, and what intervention is needed—matching treatment to the pest’s life cycle and the severity of the problem. The result is more effective control with fewer unnecessary applications.

It depends on the disease, how far it has progressed, and the tree’s overall structural condition. Many fungal and bacterial diseases can be managed or arrested with timely treatment. Systemic conditions like oak wilt or advanced emerald ash borer infestation may make removal the more practical and cost-effective option. Townsend’s arborists will give you an honest assessment of what’s viable—including when treatment is worth pursuing and when it isn’t.

Diagnosis may involve resistance drilling—a non-invasive technique that detects internal decay and structural compromise without damaging the tree—and root collar excavation to uncover girdling roots and buried crowns that accelerate decline. Where soil compaction is a contributing factor, air spade service relieves root zone pressure without harming feeder roots. Treatment depends on what the diagnosis reveals: precision tree injections and soil injection of systemic insecticide deliver treatment directly into the vascular system for internal feeders and pathogens; selective pruning and deadwood removal eliminate active infection points; deep root fertilization and subsurface watering rebuild soil and root health; and tree cabling and bracing provide structural support where disease or decay has compromised the tree’s integrity.