• Foliar Spray
  • Soil Drench

Protect your trees from Emerald ash borer and other invasive pests.

Optrol™ is a broad spectrum insecticide used to control a wide variety of insect pests including emerald ash borer, Japanese beetle, and Asian longhorn beetle.

The liVisit us at booth 3101!quid formulation comes in easy-to-pour, soil applied homeowner kit that can easily be applied without wounding the tree. Optrol™ provides season long control and research proven protection against the most difficult tree pests.

Note: A treatment of Optrol™ lasts for one season. To ensure proper tree health, Optrol™ should be applied once every year. 

Application Type(s)

Foliar Spray,Soil Drench

Active Ingredient

21.4% Imidacloprid


Applications of Optrol™ can be made anytime during the growing season as long as the ground is not frozen or saturated with water. Spring or fall treatments are recommended to ensure full protection during high pest activity.

Note: This product cannot be sold in the following states: AL, AK, AZ, CA, FL, GA, HI, ID, LA, MS, MT, NH, NM, NV, NC, OK, OR, PR, SC, TX, UT, WA, WY We can no longer ship Optrol to Canada at this time. Not for sale, use or distribution in or into Nassau, Suffolk, Kings or Queens Counties, New York

**WINTER UPDATE** Shipping during winter may be delayed due to extreme cold weather in order to protect the integrity of your product. Your purchase will ship as soon as the conditions allow. You will be notified if any shipping delays are likely to occur. We apologize for any inconvenience this may cause.

Optrol is available in the following sizes/variations.


Optrol (1122)
Optrol 8 ounce
Price: $42.50

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Optrol Quart (1101)
Quart comes in 4 - 8oz bottles of Optrol
Price: $127.50

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Not all products are available for sale in all states.  Make sure that any product you intend to purchase is registered for use in your state, and that you have all of the required licenses to apply the product purchased.  Any recommendations made by the tree geek website or its employees are based on limited knowledge of your area and are for informational purposes only.  Always seek advice from a local professional if you are not sure of your tree or pest identity.

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18 Responses to Optrol

  1. Robert Erickson says:

    How much Optrol do I need to purchase for a one time application per tree ? I have four mature (40 year old) Ash trees which so far do not show any signs of being infected with Ash Borer.

    • The Tree Geek says:

      The amount you’d need would depend on the size of the trees in question. We measure dosages based on the tree’s diameter at 4.5 feet above the ground. One bottle of Optrol treats 20 diameter inches.

    • The Tree Geek says:

      It depends on the product, We have products like Xytect 2F, 75WSP and Optrol which would work better in the spring or falls, and Transtect which would work better in the early summer/ late spring. Which one you go with would depend on the level of infestation in the tree, the current infestation pressure around the tree, and when you would prefer to treat.

  2. White birch says:

    I have been applying Optrol in every March for 4 years for my white birch tree. Could I apply Optrol twice a year, like one more time in September? Or could you please recommend any other products? My white birch has been doing good, but I see a little loss of the top leaves this year. These couple of years I have been witnessing ALL other white birch trees around my area died and disappeared, none left other than mine. I know Optrol has been protecting my tree very well, but I would like to have a full protection.

    • The Tree Geek says:


      It is not recommended to treat trees other than the suggested label rate. Some dieback is expected in years of heavy insect pressure, but if you maintain tree vigor it should have no problem bouncing back.

  3. Steve Neff says:

    I have various sized from 5 ft to 40 foot tall green and blue spruce on my property. We live in the mountains in
    Western Colorado. The Spruce Gall I believe it is has turned about 1/2 of the new growth into brown porcupine
    looking ends. Will your product work on killing these things. If so how much should I use and how is it applied

    • The Tree Geek says:

      Hi Steve,

      Optrol will work to control this, but it is best to apply in the fall or late summer for control next year. This product takes about a month to get up into the tree, so by the time it starts working the insects will already have done the damage for the year. It does last for one year though, so this is the benefit of fall treatments to avoid racing the clock. For control this year I’d recommend using Transtect in early spring. This product will be up in about 2 weeks and lasts 2-3 months. The amount of product you will need will be determined by the diameter of the trunk at chest height. Once you have these numbers I would reference the labels or application guides on the product page to determine proper dosing.

  4. Alfred says:

    I use Merit 75 in soluble packet one every April ‘ground soaking around one remaining ash tree for 4 years1

    Hate soluble powder !

    Is your optrul one $42.00 suitable do to the job !


    • The Tree Geek says:

      Hi Alfred,

      Optrol will provide Yearlong protection against EAB and comes in an 8 oz. liquid. Other users have praised Optrol for saving their ash trees.

  5. Carla James says:

    We have at least three huge Ash trees that need protecting on our one acre lot. If we treat all, or any, of these, will we still see lightening bugs in our yard?

  6. Chuck Smith says:

    I have 30 white pines planted from seedling size. Every year they get white pine weevils. I’ve been cutting back the diseased growth and also spraying in the spring and fall with permeheron 10. The trees are now about 25 feet tall on average and I still have the problem This year 8 of them are caning. What is the best product to use on a large quantity of trees? Nothing I’ve tried seems to work.

    • The Tree Geek says:

      I would use either Optrol or Xytect to protect the trees. If you have a lot of trees Xytect might be more cost effective.

  7. Joe says:

    I have a large Siberian Elm measuring @ 43″ combined trunks at chest height. It suffers from Elm Leafminer damage each year. This Summer I applied Trastect as a preventative against a second generation future damage in Aug. To prevent this next year, how much Optrol is recommended, and is late Fall more beneficial than Spring?

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