Insect Growth Regulators: A Smarter Way to Manage Certain Tree Pests
May 4, 2026
Not every pest treatment has to work the same way.
In tree care, the best solutions are often targeted, strategic, and designed around the pest’s life cycle. One tool arborists may use in the right situation is an insect growth regulator (IGR).
These products do not always kill insects on contact. Instead, they disrupt development, helping prevent immature insects from becoming damaging adults. When used properly, insect growth regulators can be an effective part of an integrated plant health care plan.
What is an insect growth regulator?
An insect growth regulator is a product designed to disrupt the growth and development of certain insects. Depending on the active ingredient and target pest, an IGR may prevent immature insects from molting properly, maturing into adults, or reproducing successfully.
In simple terms, it interrupts the pest’s life cycle.
Timing is especially important. IGRs are often most effective when applied during specific stages of insect development.
Why Arborists Use IGRs
Some tree pests can cause significant damage if left untreated. However, not every situation requires the same treatment approach. Insect growth regulators may be recommended when arborists want a more targeted option as part of a broader pest management strategy.
Potential benefits include:
- Targeted control: IGRs are typically designed for specific insect types and are often used when a pest issue is known.
- Life cycle disruption: By targeting immature stages, IGRs can reduce future pest pressure rather than addressing only what is visible at the moment.
- Useful in integrated care plans: IGRs can be one component of a broader plant health care program that may also include monitoring, soil care, pruning, and other treatments.
Why proper diagnosis matters
Not every insect issue warrants an IGR. The pest must be correctly identified, and the timing must align with the insect’s biology. That is why professional evaluation matters.
An arborist will consider:
- Which pest is present
- The life stage of the insect
- The level of infestation
- The overall health of the tree
- Whether an IGR is the right fit for the situation
Treating too early, too late, or for the wrong pest can reduce effectiveness.
Part of a bigger tree health strategy
At Xylem Tree Care, we take a thoughtful approach to plant health care. That means looking beyond quick fixes and recommending treatments grounded in science, timing, and the specific needs of the tree and property.
Insect growth regulators can be a valuable tool in certain cases, especially when used as part of a proactive strategy to protect tree health and reduce pest pressure over time.
The right treatment starts with the right diagnosis — and a plan designed for long-term tree health.
If your trees are struggling, the answer may lie underground. Yellowing leaves, poor growth, thinning canopy, or general decline can all indicate stress. Before treating the symptoms, it is important to understand the cause. That is where soil sampling comes in. Soil sampling gives arborists a clearer picture of what is happening below the surface and helps guide smarter, more effective tree care decisions. What is soil sampling? Soil sampling is the process of collecting soil from around a tree or a landscape area and analyzing it for key characteristics that affect plant health. Depending on the test, results may include information about: Soil pH Nutrient levels Organic matter content Salts or chemical imbalances Soil texture and composition This information helps determine whether the soil is supporting healthy root function or creating hidden stress for the tree. Why soil testing matters Trees can decline for many reasons, but poor soil conditions are often overlooked. For example, a tree may appear to need fertilizer when the real issue is a pH imbalance, compaction, limited nutrient availability, or excessive salts. Soil sampling helps eliminate the guesswork. Instead of applying a broad treatment and hoping for the best, arborists can base recommendations on actual site conditions. This leads to more targeted care and better long-term results. What soil sampling can reveal A soil test can uncover problems that are not visible from the surface, including: Nutrient deficiencies: Trees may lack access to essential nutrients even after fertilizer has been applied. Improper pH: If soil is too acidic or too alkaline, roots may struggle to absorb nutrients. Low organic matter: Healthy soil requires organic matter to support moisture retention, microbial life, and soil structure. Excess salts or chemical residue: Road salts, de-icing products, or previous treatments can create harmful soil conditions. A smarter approach to tree care At Xylem Tree Care, we believe the best tree care starts with good information. Soil sampling helps our team build treatment plans based on what your trees actually need, not just on symptoms that appear at first glance. That might include soil amendments, fertilization, humic acid applications, pest management, or changes to watering and maintenance practices. The goal is always the same: improve growing conditions and support healthier trees from the ground up. Because when it comes to caring for trees, the soil tells an important story.
Healthy trees start below the surface. When people think about tree care, they usually focus on what they can see: leaves, branches, canopy shape, and signs of stress. But some of the most important factors affecting tree health happen underground. Soil health plays a major role in how well trees grow, respond to stress, and defend themselves against disease and environmental pressures. That is where humic acid can make a difference. What is humic acid? Humic acid is a natural organic compound that forms as plant and animal matter breaks down over time. It is a key building block of healthy soil and helps improve the environment around tree roots. Think of it as a soil conditioner that helps the soil function better. It does not replace proper fertilization or arborist care, but it can support healthier growing conditions and improve how trees access the resources they need. How humic acid supports tree health Trees rely on their root systems to take in water, oxygen, and nutrients. When soil is compacted, depleted, or imbalanced, roots struggle to do their job. Humic acid helps improve soil structure and encourages stronger root performance in several ways: Improves nutrient availability: Humic acid can help make nutrients in the soil more available to roots, which may improve nutrient uptake and overall tree vigor. Supports root development: Healthy roots are essential for healthy trees. Humic acid promotes a better root environment, supporting stronger growth below ground. Enhances water retention: In some soil types, humic acid helps the soil retain moisture more effectively while still allowing for better drainage and air movement. Encourages microbial activity: Healthy soil is alive. Beneficial microbes contribute to nutrient cycling and soil balance, and humic acid can help sustain that biological activity. When trees may benefit Humic acid treatments may be especially helpful for trees growing in challenging conditions, such as: Compacted urban soils Construction-disturbed areas Landscapes with poor organic matter Trees showing slow growth or stress Properties with repeated drought pressure In these environments, improving the soil can be one of the most effective ways to support tree health over time. A better foundation for long-term care At Xylem Tree Care, we know that tree health is about more than what happens above ground. Our arborists look at the full picture, including soil conditions, root health, and environmental stressors, to recommend the right care plan for your property. Humic acid can be a valuable part of that strategy, helping create a healthier foundation for stronger, more resilient trees. When the soil improves, the tree has a better chance to thrive.
Randolph Hoover, CEO of XKIG, has been named to the 2026 Board of Directors for the Tree Care Industry Association (TCIA), bringing decades of leadership and a passion for advancing tree care nationwide. For Xylem Tree Care, part of the XKIG portfolio of companies, this recognition highlights the importance of thoughtful leadership in an industry that directly impacts the health, safety, and beauty of the communities we serve. With over 30 years of experience, Hoover has built an organization grounded in strong values, professional expertise, and a dedication to doing right by customers, communities, and the environment. As tree care continues to be essential in both residential and commercial settings, industry leadership promotes best practices, responsible stewardship, and long-term sustainability. Through his position on the TCIA Board, Hoover will support these priorities while advancing the profession as a whole. At Xylem Tree Care, we believe excellent tree care begins with strong leadership, trusted expertise, and a dedication to service. This appointment demonstrates those values in action and underscores our commitment to caring for the landscapes and communities we are proud to serve. Read the press release here: TCIA Board of Directors: Leadership Overview - Tree Care Industry Magazine
Putting off tree work until spring often seems easy. But, it typically has hidden costs. As temperatures rise, demand sharply increases. Scheduling windows shrink, response times grow longer, and minor issues can quickly become serious. What could have been handled calmly in winter often turns into urgent or emergency work once storms and rapid growth begin. Spring foliage also limits visibility. Structural defects that were apparent in winter may once again be hidden, reducing the chances for accurate corrections. Access becomes more challenging, and the margin for error shrinks. Perhaps most importantly, waiting increases the risk. Trees weakened by decay, cracks, or poor structure are much more likely to break during spring storms. Addressing hazards early lowers the chance of property damage, service disruptions, or personal injury. The real cost of waiting includes: Longer scheduling delays Increased failures due to storms Higher emergency service costs Missed chances for preventive care Winter provides a rare opportunity for safe access, clear assessment, and proactive solutions. Acting early isn’t just more convenient. It’s smarter, safer, and more cost-effective in the end. Treatments are more effective when done early. Start your customized tree health program today and give your trees the care they deserve. Call 1-833-544-8733 to learn more. Evaluations are free.
For commercial properties, HOAs, and facilities teams, winter isn’t a slow season. It’s the most strategic time to plan. Winter lets property managers review tree inventories, evaluate risks, and plan maintenance before spring demand increases. Instead of responding to issues as they happen, teams can create clear work scopes, align budgets, and schedule services ahead of time. Planning ahead provides better scheduling options and helps avoid the bottlenecks common in spring. It also decreases emergency work, which is usually more disruptive and expensive. Fixing known issues during winter ensures safer properties and smoother operations throughout the year. Winter planning also ensures clear documentation for boards, stakeholders, and insurance providers. Tree risk assessments, maintenance plans, and scheduled work show due diligence and proactive property management. Why winter planning works best: Predictable budgeting and cost management Prioritized scheduling before peak season Less emergency and storm response needed Clear communication with stakeholders For HOAs and commercial sites, proactive winter planning safeguards assets, manages costs, and ensures readiness for the busy months ahead. Call 1-833-544-8733 to learn more. Evaluations are free.
Storm damage rarely starts with the storm itself. In most cases, failures occur because underlying problems were already there, including weak limbs, structural flaws, or compromised trees that weren’t dealt with beforehand. Winter is the ideal time to lower storm risks before spring winds and ice events arrive. With better visibility and safer work conditions, arborists can remove deadwood, reduce canopy thickness, and fix structural issues that make trees vulnerable during severe weather. Proactive winter work greatly reduces the risk of branch or tree failure. Lowering canopy weight cuts down on wind resistance, while fixing weak attachments helps prevent breakage during ice buildup or gusts. Waiting until storm season often means reacting under pressure — limited access, unsafe weather, and urgent timelines. Winter allows crews to work carefully, safely, and cost-effectively. Effective winter storm-prep measures include: Removing dead or broken branches Reducing overly dense canopies Fixing structural issues Managing high-risk trees near buildings Prepared trees perform better during storms. Addressing vulnerabilities in winter helps property owners lessen emergency calls, safeguard structures, and enhance overall landscape resilience. Treatments are more effective when done early. Start your customized tree health program today and give your trees the care they deserve. Call 1-833-544-8733 to learn more. Evaluations are free.
Winter’s leaf-off conditions expose structural issues that can otherwise go unnoticed — until a failure occurs. Without foliage obscuring the canopy, arborists can thoroughly inspect trunks, branch unions, and overall structure. Cracks in the trunk, decay pockets, co-dominant stems, and weak attachments are much easier to spot during winter inspections. These issues are often the cause of unexpected failures during storms. Co-dominant stems, where two or more leaders grow at the same point, are common. In summer, dense foliage can conceal the narrow unions and bark that make these stems vulnerable to splitting. During winter, those risks are more visible and can be addressed before they turn into emergencies. Winter inspections also uncover lingering storm damage. Trees that seemed to recover after past weather events may still have internal fractures or weakened wood. Detecting these issues early allows for corrective pruning, support systems, or removal if needed. Issues typically found during leaf-off inspections include: Trunk and limb cracks Internal decay and cavities Weak branch attachments Structural imbalances Past storm damage Leaf-off inspections offer clarity and precision. Instead of guessing based on canopy look, arborists can evaluate true structural health and plan work more effectively. Winter is the time for informed decisions that lower risk before spring growth and storms come. Start your customized tree health program today and give your trees the care they deserve. Call 1-833-544-8733 to learn more. Evaluations are free.
Pruning is one of the best investments you can make in your tree's long-term health, and winter is the perfect time to do it. When trees are dormant, they can tolerate pruning better without stress. Without leaves in the canopy, arborists get a clear view of the branch structure, which makes it easier to spot weak attachments, crossing branches, and competing leaders. This visibility allows for structural pruning that enhances strength, balance, and future growth. Winter pruning is particularly effective for shaping young trees and addressing issues early. Proper structural pruning now helps develop a strong branch framework that decreases the chance of breakage as trees grow. For mature trees, winter is the ideal time to remove deadwood, like branches that no longer benefit the tree’s health but could be a safety hazard. Another advantage is minimized disease spread. Many pests and pathogens are inactive during colder months, lowering the risk of infection through pruning cuts. When spring arrives, trees respond with healthy new growth directed by the corrections made during winter. Winter pruning also plays a vital role in storm readiness. Removing dead, weak, or poorly attached branches now lowers the risk of limb failure during spring wind and ice storms. Benefits of winter pruning include: Clear visibility for precise cuts Stronger structure and balanced growth Reduced pest and disease risk Safer canopies heading into storm season Healthier, more controlled spring growth Instead of responding to problems after they happen, winter pruning lets property owners steer tree growth proactively. It’s an investment that yields benefits in safety, appearance, and long-term health. Treatments are more effective when done early. Start your customized tree health program today and give your trees the care they deserve. Call 1-833-544-8733 to learn more. Evaluations are free.
Most people picture tree removal as an emergency after spring storms or summer winds. In fact, winter often proves to be the best, safest, and most efficient time to remove trees that are declining, damaged, or structurally unsound. During winter, trees are dormant. Without active growth, removal causes less stress to surrounding plants and reduces disruption to the landscape. Frozen or firm ground allows equipment to operate more effectively, minimizing turf damage, soil compaction, and rutting — especially important for residential lawns, commercial properties, and shared HOA spaces. Leaf-off conditions also enhance visibility. Without foliage obscuring the canopy, arborists can clearly see branch structure, attachment points, and potential hazards. This makes winter removals more precise and controlled, reducing risks to nearby structures, utilities, and healthy trees. Another major advantage is scheduling. Spring and summer are peak seasons for tree care, often driven by storm responses and rapid growth issues. Winter usually offers more availability, allowing property owners to address known concerns without the pressure of emergency timelines or limited crew access. Removing problem trees in winter helps prevent bigger issues later. Trees weakened by decay, disease, or previous storm damage are much more likely to fail during spring wind and ice storms. Addressing them early reduces the chance of sudden failure, property damage, or expensive emergency removals. Key benefits of winter tree removal include: Reduced landscape and turf impact Better access and enhanced safety Clear visibility for accurate work Faster scheduling before peak demand Lower risk as storm season approaches If a tree has already shown signs like leaning, declining, cracked, or damaged bark, winter is the best time to take action. Proactive removal safeguards your property and promotes a safer, healthier landscape in spring. Start your customized tree health program today and give your trees the care they deserve. Call 1-833-544-8733 to learn more. Evaluations are free.
When trees grow in tough environments or surpass the space allotted to them, traditional trimming alone isn’t always enough to keep them healthy, safe, and easy to manage. That’s when plant growth regulators (PGRs) come in. These are science-based tools that improve both tree health and operational efficiency. What Are Growth Regulators? Plant growth regulators work by slowing vegetative growth, specifically by inhibiting the hormone responsible for driving cell elongation. Instead of forcing trees to grow faster or fuller, a PGR gently redirects energy toward stability, resilience, and long-term health. It’s not about stopping growth altogether; it’s about managing it intelligently. Longer Trim Cycles, Less Regrowth One of the most significant benefits of using growth regulators is operational: a single application can greatly slow shoot growth for multiple years. This reduction in woody regrowth means: Fewer trims are needed Less vegetation pressure around utility lines Less debris and labor required More predictable maintenance schedules. For utilities and municipalities, this results in cost savings, improved reliability, and more efficient vegetation management programs. Health Benefits Beyond Growth Control While slowing growth is the primary purpose, PGRs come with a suite of additional advantages that improve a tree’s vitality and resilience. 1. Increased Root Density With less energy spent on rapid shoot elongation, trees divert resources below ground. That results in: Stronger anchoring Improved nutrient uptake Better resilience in storms 2. Enhanced Drought and Heat Resistance Trees treated with PGRs often develop: More compact leaves Improved water-use efficiency Enhanced ability to withstand high temperatures This makes growth regulators especially useful for urban trees, which face compacted soils, heat islands, and irregular watering. 3. Greater Tolerance to Insects and Diseases A healthier, less-stressed tree is better equipped to defend itself. PGR use is linked to: Thickened leaf cuticles Balanced energy allocation Reduced susceptibility to certain pests and pathogens A Lifeline for Trees Growing in Poor Conditions Not all trees thrive in the places we plant them. Some are just too large for their site — squeezed between sidewalks, planted under power lines, or struggling in limited soil. Growth regulators can assist by: Controlling canopy size Decreasing structural stress Enhancing overall longevity For trees in stressful environments, PGRs offer a second chance at buying time and improving survival rates where traditional care falls short. Why Growth Regulators Matter Growth regulators aren’t just a maintenance tool. They’re a tree health tool. They help: Maintain safety around utility corridors Reduce trimming frequency and costs Improve tree resilience and root health Support trees in constrained or urban environments Extend the life of valued trees In short, PGRs allow us to work with a tree’s biology rather than against it.
