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Tips and Ideas

Here is a list of ideas and tips for successful and cost efficient operation and maintenance of the Chemjet Tree Injector for tree injection treatment.

  1. To snap the body and nozzle of Chemjet together, it helps to use your two hands and your two knees to push them together.
  2. Take care of your Chemjet Tree Injectors after the work is done (or during long term work at least once per week) so they keep working smoothly by disassembling, washing all parts with hot soapy water, rinse and air dry, then lubricate the nozzle barrel and rubber plunger washer with silicone lube or vegetable oil before reassembly.
  3. If the washer sticks and pulls off in the nozzle barrel, pull the washer out with a hooked wire. Then clean and lube your Chemjets per No. 2. The plungers will likely work fine after this.   Pull slowly don’t jerk.
  4. Drill no more than three holes at a time during injection work. Then let the drill bit cool off.  A hot drill bit may scorch the wood which will inhibit injection.
  5. Don’t twist the Chemjets when you put them in or take them out.  The tip may break off.
  6. If the Chemjet plunger is sticking (not injecting all the way down, or the plunger washer is pulling off), disassemble and clean with soap and hot water. Then lubricate.
  7. Lube Chemjets while assembled by squirting a small amount of WD 40 with the little red straw in the back side (handle side), cycle the plunger a couple of times. Or use silicone spray.
  8. Lube Chemjets by disassembling, pull out plunger, then smear some vegetable oil in the nozzle end with your finger tip and reassemble.
  9. Lube Chemjets while assembled by sucking in some lube oil (like vegetable oil) in the nozzle tip and squirting back out. Cycle the plunger a couple of times to clear excess lube.
  10. Disassemble Chemjets using a metal spoon rather than a screwdriver.  It’s easier and safer.
  11. If there is a part of your Chemjet that has failed, you can repair with new parts rather than replace with a new Chemjet.
  12. If an injection point is taking chemical too slowly or not at all, cock it back and remove, then drill and inject into another hole 12 inches or more above the slow hole. You may have to plug the lower hole if chemical comes back out there.
  13. If the tree is not taking chemical very fast, leave the Chemjets in overnight. Some trees may take a couple of days (depending on the weather and health of tree).
  14. If chemical leaks back out of an injection point, put the Chemjet back in the hole as a plug for another half hour.
  15. Use plugs in the holes if they are leaking so you can use the Chemjet elsewhere. Whittle a point on a twig and tap it into the hole, or use  plugs.
  16. If holes are not leaking chemical or sap, you can seal using beeswax or silicone caulk.
  17. If you have hard water, use distilled water when mixing propiconazole to avoid a precipitate forming which could inhibit injection performance.
  18. Decontaminate Chemjets (inside and out), drill bits and your hands before moving to the next tree to avoid transporting pathogens and infecting other trees.   Use Lysol Disinfectant solution or weak bleach solution.
  19. For trees that have multiple trunks (“double or triple” trees), inject around each branched trunk rather around the big main trunk.       This will allow better treatment performance.
  20. Do not inject during drought conditions. The chemical will not go into the tree very fast and it may hurt the tree, causing all the leaves to fall off.   Water the trees or wait for rain before injecting.
  21. If the leaves all fall off a tree due to a treatment error (injecting too much chemical, or during drought), the tree may not be dead so don’t cut it down. The leaves may grow back in later months, or in the spring.
  22. If an injector is almost finished but then seems to stop, the plunger washer may be sticking. Give the red handle a gentle push down to get it going again.
  23. The Chemjet holds 20 milliliters in the fully locked back position which is easiest to work with. If you have a treatment that calls for less volume per injection, then you may be able to dilute your chemical mix to allow use of full 20 ml Chemjet capacity for the same dose per injection point.
  24. The Chemjet locks back at 20 ml as shipped. You can custom make a smaller dose by cutting notches in the plunger stem at the desired lock back interval.
  25. Color code your Chemjets with paint for different uses.
  26. Drill holes at a downward angle so any air bubbles stay on the top part of the Chemjet.
  27. Drill holes in the bark crevice locations. You need to get into the light colored wood shavings.
  28. When drilling the tree, look for light colored wood on the end of the bit. If all the shavings are dark, then it’s a dead spot and not suitable for injecting. Move up or over and drill a new hole.


If you have good a tip or idea to share regarding use and operation of the Chemjet Tree Injector please send us a comment and we’ll add it to the list!



Additional information 

Buy Chemjet Tree Injectors Now

How Chemjet Works

Oak Wilt Disease and Treatment

Dutch Elm Disease Treatment

Save Your Trees from Oak Wilt

Emerald Ash Borer Treatment

Hemlock Woolly Adelgid Treatment

Asian Longhorned Beetle Treatment

Plugs for Tree Injection Holes

Video: Injecting for Oak Wilt

Video:  Chemjet use in Australia

Find an Arborist






Logical Result LLC is a North American Distributor for Chemjet Tree Injectors. We have also posted a few links to some other products that will refer you to Do My Own pest control. If you click the links provided for Do My Own to purchase items, we may receive a referral commission as an affiliate of the sellers at no cost to you.


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