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Karen Rockoff is the primary contact 
Jim is in the hospital & will take calls through Karen.

Karen Rockoff is the only ISA certified
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BEWARE- There are other persons fraudulently representing These persons are not authorized or licensed to use the name or inject with the chemjet system. Please contact Karen Rockoff immediately if these persons attempt to solicit these services. 

Contact:  Cell: 830.955.0304
                     Karen Rockoff  Arborist  - TDA Certified
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KESTREL® Label Instructions for Chemjet


KESTREL® Propiconazole 14.3 %   -  Label Instructions

Chemjet Trunk Injection

For Oak Wilt Treatment

The Chemjet micro-injection syringe is designed to treat urban and rural trees depending upon the disease pressure in your area. The chemjet has a volume capacity of 5 - 20 mils and when applying KESTREL® propiconazole 14.3%, It is recommended to premix the Kestrel with an equal part of water and draw 20 mils of the chemical / water 50-50 solution into the barrel and with 1/4" turn of the plunger handle into the locking position. This procedure provides the preventive treatment dosage of 10 mils per diameter inch using 10 mils of water as the carrier which also  lowers the viscosity of the fungicide and allows faster uptake. The syringes will have to be refilled and placed in the same holes to provide the therapeutic dosage of 20 mils per diameter inch.

Once the syringes are filled with the prescribed amount product, they should be placed in a bucket with the red plunger handles down and the nozzles upward. This will avoid leakage until they are ready for use.

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.

The syringes will contain 20 mils of a 50% formulation of Kestrel / water and to be applied at the rate of one syringe per diameter inch of DBH. Determine the number of syringes to use per tree by determining the circumference. e.g. A tree with a circumference of 60", divide by 3 equals approximately 20 inches Diameter at Breast Height. (DBH). A tree with a DBH of 20 inches would require 20 syringes placed approximately 3 inches apart equidistant around the trunk stem or that is the same as 1 syringe per diameter inch.

The syringes should be placed in the trunk flares close to the soil (2 to 6 inches above the soil-wood line). It is very important not to place syringes in trunk flare valleys, as poor distribution of the material may occur. Once the tree DBH has been determined, place the syringes on the ground around the tree in the trunk flare areas that will result in the best distribution of the material throughout the tree. The aim of tree injection is to use the tree's natural transport system which uses the water within the tree for dilution and distribute of the injected product.

KESTREL®,  Propiconazole, a systemic fungicide, ( XMS .. Xylem Mobile Systemic ) does not require high dilution rates with water, so treatment is considerably faster, and there is less tissue injury at the injection site as it has a near neutral pH factor.                                                                                                Here is a comparison to size:  O = 11/64" and  O= 5/16" The overall hole volume comparison is 75% less.

You can place your chemjets from above the soil level to a height of 4 1/2 feet up the trunk stem. You choose the best and most comfortable height to inject your trees. The water movement and flow rate is the same at all points in the trunk stem.The water movement up the trunk is at the rate of 92 feet per hour.

Once the syringes are in place unlock the Chemjet with 1/4 " turn and the spring will gently force the chemical into the tree. If you do not get a tight seal, with the open palm of your hand give the Red plunger handle a gentle nudge and you will hear a popping and that signals that you have a water tight seal.

NOTE: The Chemjet requires a 11/64" drill size bit.  Injection needs to be into the sapwood, and with the smaller drill, the tree can focus less energy to recover from the smaller and the reduced number of macro drill portals wounds. 

Drill the holes approximately 0.75 to 1.25 inches deep on a 45 degree angle to the main trunk where each syringe is to be placed. The holes should extend just into the tree xylem area. It is best to drill 3 or 4 holes at a time and then place the syringes into these portals. Once the syringes are in place unlock the RED plunger handle with 1/4 " turn and the spring will gently force the chemical into the tree. If you do not get a tight seal, with the open palm of your hand give the RED plunger handle a gentle but, firm nudge and you will hear a popping sound and that signals that you have a water tight seal.  Continue this practice until all injector syringes are installed.. It should take you about 10 minutes to inject a 24" diameter tree. and about 3 - 5 hours to complete the uptake of the chemical.

Oaks trees generally have a more efficient and a higher rate of wound closure up the trunk stem extending from above the trunk base to upper branches as it is associated with stem growth and the annual increase of the outer sapwood, the cambium tissue as well an new bark tissue. Meristem cells (similar to stem cells in humans) display an important role in cell regeneration and wound closure ... and the tissue layer known as cambium..... 

The applicator should attempt to evenly distribute the chemical through the tree by evenly spacing injection sites around the trunk of the tree.

Proper location of these injection sites is critical for proper distribution of the fungicide. Inadequate distribution leaves trees poorly protected.

Once the syringes are in place, it will take approximately 3-5 hours for the uptake to be completed. Time to empty the syringes can vary depending on the time of the year, humidity, weather conditions, the tree health, soil moisture conditions and bright sun with mild temperatures facilitate the emptying of the syringes. At the time of treatment, residents and landowners should be encouraged to water the soil under the trees prior to treatment to help increase its effectiveness. The syringes should remain on the treated trees for a maximum of 3-5 hours, but if empty before they can be removed from the tree. If the syringes have not emptied they can be left over night to complete the injection. 

For trees that have been injected previous years, injection sites can be staggered 3 to 6 inches above and between old injection sites. In an effort to achieve good uptake, injections can be made from the trunk flare up to a height of 12 inches from the soil line.

Trunk injection syringe units will be cleaned of all debris and inspected and regular maintenance will be performed as detailed in the manufacturer's Instructions for Use. Prudent preventative maintenance should minimize delays due to equipment malfunction. Malfunctioning equipment should be removed from service and replaced with a working syringe, or may be repaired and returned to service if the problem can be corrected in a reasonable amount of time.

Phoenix Environmental Care, P.O. Box 370, Valdosta, GA 31603-0370


•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    

•KESTREL® , Propiconazole 14.3% MEC

•2 ½ gallon bucket for loading & carrying syringes


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.


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.

•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.

•If using the therapeutic 20 mil dosage rate, simply refill the chemjets for a second time with the 50/50 Kestrel® / water solution replace the syringes in the same drill portals and uptake will be normal 3-5 hours.    

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. You can place your chemjets from above the soil level to a height of 4 1/2 feet up the trunk stem. You choose the best and most comfortable hight to inject your trees. As mentioned above the water movement and flow rate is the same at all points in the trunk stem. Please remember, to drill on a slight downward angle of 45 degrees . 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. If there is a damaged area in the trunk simply move above the damage area to complete injectrions.

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. You will here a click, which affirmes you have a good 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. NOTE  The Pathogen is heat sensitiove and 95 degrees F will destroy the pathogen. so regular hot water  (120 degrees) from your tap is fine. 

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 ) Always 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, the trunk stem is from the soil line to the branches or limbs. The root flare and trunk flare is the most critical area, it is the life line of the tree, water and nutrients from the roots and sugars to the roots for growth and stotrage.When repeative and excessive damage occures to this critical area death can and will occur. 

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)

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. Unlike the MACRO injection system, that utilizes a very high volume water at the rate of 10 mils of fungicide diluted per liter of water. Often times, the tree will not absorb the full prescribed amount of fungicide/water solution, leaving as much as a 1/3 to 1/2 of the total required volume in the reserve tank and lines.

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® 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 ! !

Chemjets places approximately 3 incheas equiidistance apart around the trunk stem.


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