Kerrville, Texas
Injection Uptake Varies for S.O.D - 5 to 45 minutes for Oak Wilt - 3-5 Hours  © ChemjetUS 2017
Photos: Copyright - Jim rediker
The picture above of the Chemjet® injectors were purchased from: and being used by the University of California, California Agriculture, Forestry Lab to inject Potassium Phosphate fungicide K2HP03 into oak trees to help prevent infection with the Sudden Oak Death caused by the pathogen Phytophthora ramorum . The Chemjet® injectors work equally well for the injection of Insecticides, Fungicides and Nutrients.
TREE INJECTOR SYSTEM A simple, hand-held, plastic liquid injector for trees bears a likeness to an overgrown syringe and works on much the same principle. The system is said to be a cost efficient method for injecting insecticides, fungicides, fertilizers, and trace elements into any limb or trunk of 2 in. diameter or greater. After an injector has been filled by submerging its tip in solution and pulling up on the spring-loaded "T" handle which is then twist locked, it is ready to be tightly inserted into a pre-drilled hole and unlocked. The internal spring then applies steady pressure delivering the injector's contents, usually in 3 to 5 hours depending on weather and sap viscosity. Once empty, The Chemjet® injectors with their bright red handles are easily seen, quickly retrieved, cleaned, and ready for use again. EQUIPMENT •Chemjet® syringe injectors  •Chisel (only needed for large bark furrows)  •Cordless drill with a 11/16’ or a 4.2 mm high speed drill bit  •Kestrel® , Propiconazole 14.3% MEC  •2 ½ gallon bucket for loading & carrying syringes  PREPARATION •If using the preventative 10 mil dosage rate -Dilute 1 part Kestrel® with 1 part water and fill the syringe with 20 mils of the solution.
SAFETY: Propiconazole taste nasty. It 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. TIMING: Injection is most effective in spring, summer & autumn, on warm, sunny mornings. Early morning is the  ideal time as the trees will shut down to conserve water around 11:30 to noon time. You may also inject your trees in early evening around 7 pm when it begins to cool down. Avoid injecting on days over 100°F. Propiconazole has a two year residual and it is recommended to repeat a follow up treatment approximately 22-24 month later. If your trees are infected with early sighs and survives the first treatment, it is recommended to retreat in a years time. Preventative treatments, before infection has occurred, has been found to be more effective than curative treatments.  Step 1 Carefully load the Chemjet® syringes from a bucket that contains the diluted 50 /50 water - Kestrel ® (  Propiconazole MEC 14.3%) solution. Immerse the tip of 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.  Note: 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. Step 2 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. 
Step 3 Drill a hole into the tree trunk. Injection needs to be into the sapwood, so don't drill  any deeper than 1 1/4 ” inch and on a downward 45 degree angle. Drill the hole 4 to 6 inches above the trunk flare or if your knees and health dictate, you can drill at knee height so that it is comfortable to inject, and remember the slight downward angle. Do not inject trees under 2 ½” diameter Note: The syringe will penetrate the sap wood only about 1/2  inch 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 sap wood.  Step 4 Drill a hole every 3 inches equidistance apart around the trunk flare (this is almost  one hand width). Multi stemmed trees need holes in each trunk.  Step 5 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 inch into the xylem or sap wood. 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. Step 6 Under ideal conditions the syringes should be finished injecting in 3-5 hours. Note  that 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 Kestrel ® ( Propiconazole ) has been injected.  Step 7 Count the syringes before use to ensure that none are lost while injecting. After use  clean the syringes with warm soapy water, (above 95 degrees F) rinse in clean water. A regular application of silicon spray inside the syringe's chamber will ensure they will inject smoothly. Syringes should be disassembled at least once a season and cleaned using the  manufacturers instructions. 
The   Don't   's   and   some   little   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 and keep your drill cool !  Do not place the syringes too close together, this may cause phytotoxicity (leaves turning yellow ) maintain the 3 inch spacing.  If the syringes 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. NOTE: 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   THE   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  that 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 damageto this 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.  See drill size comparison of the chemjet 11/64" to the macro 5/16" drill size - Chemjet drill size: 11/64" = O which is half the size of Macro drill size: 5/16" = O
The MACRO injection requires a far greater number of injectors, due to the larger  exposed area of root flare area. (A rule of thumb: ... 3 drill portals for each diameter inch e.g 16" dia tree equates to 48 drill portal). ( See photos below ) The Chemjet® injectors delivers far better results, with only 16 small drill portals at a lesser cost to the tree with smaller drill damage, faster wound closure, very efficient uptake, less intensive labor, and best of all your job is out of the dirt providing the least chance of pathogenic  infection. ....... All in All........ Your tree wins ! !
TO ORDER KESTREL® by the Case 4 x 1 gal jugs :  Phoenix Environmental Care, P.O. Box 370, Valdosta, GA 31603-0370 Toll: 1.888.241.8845
The flare roots are exposed 4-6 inches below the soil level, the injectors and harness are installed and connected to the pressurized reservoir tank, as the injection begins, taking 6 to 24 hours for completion.For a 16 inch diameter tree it is necessarey to drill 3 times the diameter or 48 drill holes. After removal of the equipment, the dirt is replaced around the root flares, filling the drill portals with dirt and debris. This will cause serious canker and, microbial infections to the cambium and sap wood tissue. We are trying to save the tree from one disease and by doing the job in the dirt, we inflict more serious problems than we can possibly imagine. .... DO IT IN THE DIRT ... Out of SIGHT ... Out of MIND.... You maybe without one TREE !!!!!!! THE MICRO INJECTION
The Injectors are placed 3" apart around the tree at knee high ( 0ne injector for each diameter inch ) For a 16inch diamerer tree just 16 small drill holes. Uptake is within 3-5 hours, relitive to humidity, air temperature, wind conditions, soil moisture and the health condition of the tree. If necessary leave the injectors over night. The job is out of the dirt, avoiding soil borne microbial and canker infections. Wound closure is within 3-5 weeks due to the smaller drill portals of11/64", which is half the size of the required macro- injection drill portals. Result.... Less Labour... Less Invasive Damage........ A Healthier, A Happier, CHEMJET TREE !!!
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 least amount of damage. A tree in good general healthy condition, these very small shallow wounds ( 4.2 mm or 11/64" drill portal ) created in the drilling process close very readily and will heal within weeks. Oaks trees generally have a higher rate of wound closure.