How to Use

Propiconazole 14.3%
For treating Oak Wilt, Dutch Elm Disease, Anthracnose and Laurel Wilt

  • Equipment:
  • Chemjet syringe injectors
  • Chisel (only needed for large bark furrows)
  • Cordless drill with a 11/64″ or a 4.2 mm high speed drill bit
  • Propiconazole 14.3% MEC
  • 2 ½ gallon bucket for loading & carrying syringes
  • Eye protection and gloves
  • Mixing container
  • All purpose disinfectant (always spray your drill bit from tree to tree along with any other tools)​


​If using the preventative 10 mil dosage rate -Dilute 1 part with 1 part water and fill the syringe with 20 mils of the solution.

If using as therapeutic (tree is showing signs of early infection) or you are in a “high pressure” disease area then you will double the number of injectors to treat a tree. Do not use same drill hole if you have to do two separate sets of injections as the wounds begin healing after 36 to 48 hours.


Propiconazole will sting eyes and cuts, but causes no permanent damage if rinsed immediately. Follow the label directions. It may irritate sensitive skin, so wear elbow length PVC gloves, safety glasses and old clothes when injecting. Take care when using sharp equipment such as drills and chisels


Carefully load the Chemjet syringe from a bucket that contains the diluted solution. Immerse the tip o the syringe in the solution and pull the plunger back slowly to minimize any air bubbles forming in the syringe. Twist the plunger 1/4 turn to leave syringe in the locked position. The syringes should not be preloaded and placed in the lock position for an extended period of time. The extended time period and spring force may damage the lock position slot. it is best to use the product filled syringes in a minimum time following preloading. Place the loaded injectors red handle down in your bucket otherwise they will leak if nozzle end is down.

When injecting, if the bark furrows are deep, remove only enough of outer bark to get a good seal with the syringe. A chisel can be used, however this is not broadly recommended as it can cause unsightly scars in the bark for a short time until they weather a while. If using a chisel be careful not to go deeper than the bark tissue.

Drill a hole into the tree trunk. Injection needs to be into the sapwood, so don’t drill any deeper than 1.5-2 inches and on a downward 45-degree angle. Drill the hole 4-6 inches above the trunk flare. If bark is thick it is ok to move injections up a little farther. Do not inject trees under 5″ diameter. The syringe will penetrate the sap wood only about 1/2″ for a proper seal. The screw thread effect on the nozzle is for strength and does not need to be inserted into the tree. If weeping occurs, with the open palm of your hand, apply a gentle, but firm nudge to seat the syringe a little deeper into the sapwood.
As you insert syringe nozzle into the drilled hole avoiding any twisting to prevent damage to the syringe tip. You will not need to the use the thread at the top of the syringe tip. (It is to provide strength to the nozzle). Gently push the syringe tip into the hole to get a good seal. The injector will seat within a 1/2″ into the xylem or sapwood. Release the plunger from the cocked position. As mentioned above, you may have to give the red plunger handle a gentle nudge with the open palm of your hand to help get a better seal.

Under ideal conditions the syringes should be finished injecting in 3-5 hours. Trees can vary on the time taken to be injected depending on the tree’s health, time of day and weather and soil conditions. You may have to leave the syringe over night. If significant leakage occurs try injecting into another hole or delay injection to another day. Remove syringes once all the Propiconazole has been injected

Count the syringes before use to ensure that none are lost while injecting. After use clean the syringes in a hot water bath of at least 95 degrees. If you wish you can add a disinfectant, we recommend Monterey Consan 20(NO BLEACH!). Remove and drain in a bucket with holes by standing them on the handle. A regular application of WD-40 sprayed into back of syringe body to ensure they will inject smoothly.Syringes should be disassembled at least once a season and cleaned using the manufactures instructions.​

Wound Closure​​

There are very good research studies on wound closure. Small, Shallow holes should be enough to allow us to inject the needed amount of product into the tree and cause the lease amount of damage. A tree in good general healthy condition, these very small shallow wounds (4.2mm or 11/64″drill portal) created in the drilling process close very readily and will heal within weeks. Oak trees generally have a higher rate of wound closure. You can use bee’s wax to fill the holes, if you are concerned of insect infestation.

The toilet bowl donut, which is made of bees wax, can be purchased are your local hardware store or plumbing store. It is non allergenic to your trees.

The Don’ts and Some Tips

  • Do not drill more than three drill holes at a time, a hot drill can burn the surrounding wood tissue and uptake will not happen. Also you can better keep track of the holes as they are small and can be difficult to locate. So do only a few holes at a time to keep your drill cool.
    Do not place the syringes too close together. This may cause phytotoxicity (leaves turning yellow) maintain the 3 inches spacing.
    If the syringe is not totally empty, you may drill another hole above the existing hole or just leave it for a night or two.
    The uptake on the sunny side of the tree will be much faster than the shaded side. A cool breeze will also promote a faster uptake and the same following a good a rain.
  • The root flare is below the soil line and the trunk flare is above the soil line
    Most important, do not inject a tree under drought conditions; make sure you water your trees thoroughly the day before injection. Propiconazole under drought conditions will zap your tree as it causes (phytotoxicity burning and yellowing of leaves and possible eventual death)​
    More Information about Chemjets​
  • The Chemjet tree injectors, delivers the same prescribed volume of the fungicide (Propiconazole 14.3% MEC) at the preventive rate of 10 mils per diameter inch in a 50% concentrated solution measured at 20 mils per injector. Each injector placed 3″ apart around the trunk stem 4-6 inches above the trunk flare. The Chemjet procedure with the higher concentration is much like a booster shot of an antibiotic only with far more effective results. The aim of tree injection is to use the tree’s natural transport system which uses the water within the tree for dilution to distribute pesticides, fungicides and fertilizers throughout the entire tree to the areas where they are most effective

The Chemjet tree injectors are far less invasive and the wound closure, due to the small shallow holes will close within a few short weeks. The overall damage is reduced by more than 85% versus the Macro System.
Following the Macro injection, the dirt is replaced and fills the drill portals subjecting the tree to more peril. This delays wound closure and often causes canker or pathogenic infections in the root flare.
Excessive damage to the most critical transition area of the root flares limits the water and nutrient movement to and from the roots and can cause serious loss of vigor or eventual death.​​

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