Orthene Root Injection



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Organo-Lawn believes the safest and most environmentally friendly way to treat tree insect pressure is via soil injection or soil drench. Many insects that attack trees can be controlled using products like Orthene. The tree is injected with the pesticide underneath the ground and the tree roots absorb the product and push it into the foliage of the tree. When the insects feed on the foliage the problematic tree insects ingest the insecticide and die.

Tree root injection allows for very high control rates of a wide variety of problem insects without harming the beneficial insects like honeybees, ladybugs, nor lacewings. Soil injections allows for very high control rates of insects like aphids, spider mites, honeylocust plant bug, or other insects that feed on the leaves of the tree. Soil injections are considered bee safe and unlike aerial spraying, birds, squirrels and other animals that live in the tree will not come in contact with the pesticide. Also, root injection is safer for people and neighboring plants because there is no drift from the spray. Root injections can even be applied on windy and rainy days.

Orthene is a wonderful tool for controlling damaging tree insects without harming beneficial insects. Orthene can be used when we need fast control on tree insects like aphids and spider mites. Fast results can be seen within 3 days after the application and will only persist in the tree for 2-4 weeks. Orthene is a fast acting, quality tree service, but short lived; therefore, a second application after 2-4 weeks may be necessary. If no additional insect pressure occurs then no secondary tree root applications will be required.

Quality Tree Service Boulder

Tree care issues include aphids, which can reproduce at a rate of
20 babies per day, per aphid.

Important Note about Honeybees: Orthene is NOT in the neonicotinoid family of pesticides. As a quality tree service company we understand that neonicotinoids are highly toxic to honeybees and we greatly care about the safety of honeybees. If you are concerned about the use of neonicotinoids and their toxicity on honeybees then we suggest considering Orthene as an option for control of insects on trees.

Note: Orthene does not control all of the same problematic tree insects that Merit will control so consult our office before ordering this service.

Organo-Lawn is your local tree care expert that cares about the environment and safety of beneficial insect and birds. Please call Organo-Lawn in Boulder (303) 499-2000 or Fort Collins / Loveland area (970) 225-9425 before contracting to spray a tree.


Any time there is active insect pressure and the problematic insects can be controlled using Orthene.

Orthene Links:

Orthene is registered under the EPA Reg. NO. 59639-26 and is 75% Acephate and 25% Other Ingredients.

Quality Tree Care Fort Collins

When used as a soil injection Orthene is considered to be safe for honeybees.

Orthene Root Injection Pricing*

Discounts: $5.00 off orders over $100.00, $10.00 off over $150.00
and $30.00 off over $300.00

Tree Trunk Diameter** - Cost Per Tree

Flowers - $2.50
Small Shrubs 6" or Less - $4.00
Medium Shrubs 6-18" - $7.00
Large Shrubs 18" or Taller - $9.00
1" Tree Trunk Diameter - $12.25
2" Tree Trunk Diameter - $14.25
3" Tree Trunk Diameter - $16.00
4" Tree Trunk Diameter - $18.00
5" Tree Trunk Diameter - $20.00
6" Tree Trunk Diameter - $22.00
7" Tree Trunk Diameter - $24.00
8" Tree Trunk Diameter - $26.00

Additional Inches - Call for Pricing
* Minimum purchase of $55 is required

** Click here to learn how to calculate the diameter of your trees

FAQ - Orthene

Is Orthene tree insecticide safe for bees?

  • Orthene is NOT in the neonicotinoid family of insecticides. If Orthene is sprayed on the foliage of a tree it could be considered toxic to honeybees. We DO NOT apply Orthene as an aerial spray; instead we apply Orthene as a soil injection. According to scientific studies when applying Orthene as a soil injection there has been no evidence that the honeybees come in contact with the insecticide Acephate.
  • The reason for this is because the insecticide cannot penetrate the abscission layer of the tree and therefore the insecticide does not get into the flower or pollen of the tree.