Tree Injection for Disease Treatment

Trees can now be injected rather than sprayed to control insects and fungal infections in many cases. Smith’s offers tree injection as well as spray and soil drench for treating disease.

Trunk Injection can reduce exposure to pesticides and treat an entire tree with no loss of insecticide to drift. Below we have links and quotes from two major proponents of tree injection. Smith’s has no affiliation with these companies, and these companies are not the only high-quality tree injection options. Advantages of injecting systemic pesticide such as for insects and fungal/bacterial infections of trees is the reduced amount of total chemical used. While foliar spray of pesticide is often a preferred application method, there is a percentage of the product that drips off the tree or drifts. With direct injection there is no drip or drift. Injecting into th trunk of a tree does cause small sites of injury to the tree and this should be considered when choosing the method of treatment for tree diseases.

From Arborjet’s Web site

“Trunk Injection AdvantageTrunk injection is the most effective alternative to spraying or soil applying pesticides for tree insect or pest control. Arborjet trunk injection equipmentinjects formulations directly inside trees. With over 10 years of research and development, our trunk injection systems and formulations are proven to give the best results when protecting trees from pests.Simple & QuickThe Arborjet drill-plug-inject method is easy to learn and application is quick. The Arborjet trunk injection system is a perfect fit for the do-it-yourselfer but is best applied by a professional, especially for more serious problems.Eco-Friendly: Unlike spraying or soil applications, Arborjet’s system injects directly into the tree, limiting any impact to your family, the applicator, and the environment around you. Cost Effective: Equipment & formulation costs  are much less costly than they use to be. Service providers can offer a program that is valuable to the homeowner and still very profitable for them. ” -Borrowed from

From Arborsystems website:

“How long before you can walk, mow or let your pets on the lawn after tree treatment?

Posted on August 24, 2015 by ArborSystems

Immediately with ArborSystems Wedgle Direct-Inject Tree Injection System. It is a closed system. The self-sealing chemical packs and sealed injection system virtually eliminates exposure concerns. The chemicals are injected directly in the tree, not on the lawn, car or play equipment. Tree professionals have no need for signs telling homeowners to stay off the grass when they use a Wedgle. And once the tree is injected with the chemical, it is done. No waiting for uptake or guarding the tree (or coming back later to collect chemical containers).” – -Borrowed from

Your Tree dripping sap on cars and patios may from aphids.

Aphids are a prime cause of trees dripping sap,  but aphids are easily treated. We control aphids in trees safely and stop the dripping.

Some trees drip because they are infected with aphids. It is always helpful to control any ants that are feeding on the sugar the aphids secrete. This is important because ants protect aphids from their natural enemies.

Aphids in trees have a many natural enemies that can control the population naturally, albeit slowly. When controlling aphids, bear in mind that we want to preserve the beneficial insect population. For faster results, a low-toxicity insecticide can help stop the dripping resulting in those sticky sidewalks and cars covered in sap.

Aphids as well as white flies can be knocked off trees and shrubs with a strong jet of water. Using neem oil or insecticidal soaps can help control aphids, but because it is not systemic, the material has to contact every aphid for the treatment to kill them all.

Insecticides containing acephate, permethrin, diazinon, or malathion are effective against aphids, but they can harm beneficial insects so these should be used when the problem is severe. many of these can be directly injected into the tree and this eliminates human and beneficial insects from coming into contact with the insecticide.

If you oak tree is dripping, the link (click on picture) below will give you more info on harmless oak tree dripping.

Fall Webworm (caterpillar webs in trees)

Fall webworm: mostly occurring in Liquidambar and walnut trees.

In most cases, the aesthetic issue of the unsightly webs is what people want to control. The damage is not usually extensive, but limited to the foliage that is covered by the web. The more webs, the more leaf skeletonizing by the caterpillars. If they are let go to feed out and pupate, there may be higher level of infestation year after year. 

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Control options:

  • Do nothing. Caterpillars will feed out, decend and go into pupa stage and emerge next year as adult moths which will lay eggs for new cycle. Webs will biodegrade with winter weather.
  • Mechanical removal only (climber with pole saw and/or pole pruner) will limit unsightly webs and expose caterpillars to natural predators, but may allow survivors to go into pupation and emerge as adult moths the following year. It’s hard to get all web remnants, but is 80% – 90% effective.
  • Spray with pesticide only (pyrethrin for contact but no residual (organic program compatible, bio-degrades within 24 hours), or permethrin for more residual). Bt can also be used, but early timing is more of an issue. Spinosad is another organic program pesticide. A strong spray stream can knock webs apart and expose caterpillars to contact pesticide kill, but will leave web remnants hanging.
  • Combination mechanical removal with follow up canopy spray. Gets webs and kills all caterpillars.
  • Systemic insecticide:
  • 1. during active infestation we have to use fast uptake systemic, like Safari with PentraBark basal bark treatment, or better yet ArborJet ACE-jet (acephate) stem injection. This will kill feeding caterpillars, but won’t remove web. Webs will biodegrade in time.
  • 2. spring treatment with imidacloprid (soil drench (Merit or Criterion) or stem injection (ArborJet IMA-jet) will deliver pesticide to feeding caterpillars in late summer/fall. Web building will be largely limited.

Our prefered choices;

During active infestation: mechanical removal followed immediately with pyrethrin canopy spray for knockdown.

Preventive: Imidacloprid soil drench in fall or spring for full season control (which also prevents other pest buildup like scale and aphids).