Plant Health Care

The control of harmful pests is a significant part of tree care, and some pests may require immediate attention. Gypsy moth, for example, can completely defoliate a tree in one season! At Carroll Tree, we can identify problems, and if treatment is necessary, determine the best method of control.

Harmful insects are commonly found on, under, or inside of leaves, twigs or bark. Obvious signs include chewed or damaged leaves, leaves with tunnels or mines, and holes in the bark of the tree. However, depending on the insect, it can be difficult for some homeowners to see activity. Some tree diseases may cause death immediately and others can ruin a tree's aesthetic appeal or weaken it to a point where the tree becomes vulnerable to environmental stresses.

In general, timing is critical for treatments to be effective because all insects have unique life cycles!

If you have a tree that does not look well, if you notice unusual insects, or if you just have a tree that is especially important to you, it may be appropriate for an arborist to give an assessment of your tree’s health.

For more information on insects and diseases on trees and shrubs visit the University of Maryland Cooperative Extension Home & Garden Information Center.


Scale   Fall Webworm

Integrated Pest Management (IPM)


Our trained plant health care technicians will inspect your landscape for damaging mite, insect and disease pests.  Treatments will be made as needed to keep these pests below harmful thresholds.  This approach allows us to minimize pesticide use on your property and maintain a healthy ecological balance.

Horticultural Oil Spray

The use of horticultural oil is an integral part of our IPM program.  Treating your ornamental plants with this environmentally safe material aids in the prevention of damaging pest populations.  Applications are typically timed in the spring or fall to maximize effectiveness.

Systemic Insecticide Treatments

Another component of our IPM program is the use of systemic insecticides.  By injecting or drenching a small amount of these materials at the base of key landscape plants we can prevent insect problems for an entire season while avoiding issues associated with traditional pesticide applications.

Target Sprays

Suppression of certain landscape pests, such as bagworm or wood boring insects, require the application of a pesticide spray with the correct timing.  Our technicians are trained to treat these hard to control pests while using the safest pesticides and application methods available.


Disease Control

Foliar spray

Foliar diseases, such as anthracnose on native dogwoods, need to be treated preventively. These treatments require three to four sprays at roughly two-week intervals to provide disease suppression.

Dutch Elm Disease

This disease has wiped out most American elm trees throughout the United States. Preventive fungicide injections directly into the trunk of the tree, along with adequate cultural practices such as removing deadwood are the best ways to keep your elm trees disease free. Click here for more information on Dutch Elm Disease.

Ash tree decline before and after Emerald Ash Borer infestation, Toledo, OH 2006 - 2009 (Credit: Dan Herms, OSU)


Emerald Ash Borer (EAB)

EAB is an invasive beetle from Asia which first appeared in the United States in 2002. Since EAB's initial discovery in the Detroit area, it has spread to 30 states and two Canadian provinces. EAB is 100% fatal to untreated native ash trees. Mortality typically occurs within four years of initial infestation due to EAB larvae tunneling beneath the bark. Tens of millions of ash trees in Midwestern and eastern states have already succumbed to this devastating pest.

In Maryland, EAB was first discovered in Prince Georges County in 2003. It has now spread throughout much of the state and has infested ash trees in nine counties including Howard, Anne Arundel, Montgomery, and Calvert. In 2011, a new EAB infestation was identified in Columbia, MD. As of June 2015, EAB has been detected in Carroll, Baltimore, Harford counties and Baltimore City along with several eastern shore counties.

Fortunately, your ash tree can be protected through preventive treatments. The application of a systemic, trunk-injected insecticide prior to infestation is extremely effective in suppressing EAB. This biennial treatment to prevent EAB damage is very cost effective when weighed against the aesthetic, environmental, and financial impacts of removing a mature shade tree. Choosing to be proactive in protecting your ash tree is the best way to ensure that it will not be affected as EAB spreads across the region.

Please contact us via phone or email to learn more about how we can help protect your ash trees. You may also refer to the Emerald Ash Borer information website or the University of Maryland Extension website for more information.


Sam Mays identifying EAB larvae infestation


Plant Growth Regulator


Many landscape and street trees are adversely affected by limited root space and drought stress. The application of plant growth regulators (PGRs) will help alleviate these issues by increasing fine root growth and leaf thickness. One treatment lasts up to three years. PGRs are also known to suppress symptoms of bacterial leaf scorch and chlorosis. Click here for more information on PGRs.


Winter Deer Repellant


We use the strongest deterrent available to protect your woody ornamentals from deer feeding. One to two applications will last from fall through spring. Click here for more information on deer repellant.


Anti-Desiccant Spray

Winter damage is common among broadleaf evergreens, especially those with frequent exposure to windy conditions. Treating your susceptible ornamental plants with an anti-desiccant will help maintain their health and beauty throughout the long winter.


Please use the links below to find out more information about the products used by Carroll Tree Service Integrated Pest Management technicians.

MDA License #516                                                                                                                                                         Maryland Poison Control Center 1-800-222-1222

 Abamectin 0.15 EC  Miticide  Label / MSDS
 Acelepryn  Insecticide  Label / MSDS
 Acephate 97 UP  Insecticide  Label / MSDS
 Agri-Fos  Fungicide  Label / MSDS
 ArborMectin  Insecticide  Label / MSDS
 Arbotect 20-S  Fungicide  Label / MSDS
 Astro  Insecticide  Label / MSDS
 Bisect L  Insecticide  Label / MSDS
 Captan 80WDG  Fungicide  Label / MSDS
 Conserve SC  Insecticide   Label / MSDS
 Copper Sulfate  Fungicide  Label / MSDS
 DeerPro  Deer repellant   Label / MSDS
 Dimilin 25W  Insect growth regulator   Label / MSDS
 Distance  Insect growth regulator  Label / MSDS
 Dithane 75DF  Fungicide  Label / MSDS
 Echo 720  Fungicide  Label / MSDS
 Ensign 720  Fungicide  Label / MSDS
 Floramite SC  Miticide  Label / MSDS
 Forbid 4F  Miticide  Label / MSDS
 Garlon 3A  Herbicide  Label / MSDS
 Hexygon DF  Miticide  Label / MSDS
 HyTECH Polymer  Anti-desiccant  Label / MSDS
 Imidacloprid 2F  Insecticide  Label / MSDS
 Imidan 70W  Insecticide  Label / MSDS
 Lepitect Infusible  Insecticide  Label / MSDS
 Mauget Stemix Plus  Micronutrients  Label / MSDS
 Mefenoxam 2 AQ  Fungicide  Label / MSDS
 M-Pede  Insecticide  Label / MSDS
 Onyx  Insecticide  Label / MSDS
 Pentrabark  Surfactant  Label / MSDS
 Propiconazole 14.3 Select  Fungicide  Label / MSDS
 Prosecutor Pro  Herbicide  Label / MSDS
 PureSpray 10E  Insecticide  Label / MSDS
 Scimitar CS  Insecticide  Label / MSDS
 Snipper  Fruit inhibitor  Label / MSDS
 Subdue GR  Fungicide  Label / MSDS
 Talus 70DF  Insect growth hormone  Label / MSDS
 Tengard SFR One Shot  Insecticide  Label / MSDS
 Tide Paclo 2SC  Plant growth regulator  Label / MSDS
 Transtect 70wsp  Insecticide  Label / MSDS
 Vapor Gard  Anti-desiccant  Label / MSDS
 Zenith 0.5g  Insecticide  Label / MSDS