Stem Injection

steminjectionStem injection is delivering herbicide directly into the hollow cane of the plant. Injections are made in the lower portion of the plant in the first few nodes above the ground.
Delivering herbicide directly into the plant, above the root crown dramatically increases the translocation ability of the herbicide throughout the plants root structure. 
In 2004, the J. K. Injection Tool was commercially introduced. The needle is inserted perpendicular to the stem, and midway between lower nodes. The applicator squeezes the trigger and the pre-set amount of herbicide is delivered into the stem cavity.

With this method there is no need to cut canes, or handle viable plant material for disposal.  Each cane develops its own rhizome system.

 Injections can be made anytime during the growing season and into the late season with the JK Short Needle.

Why inject below the third node for Japanese Knotweed?
 If plants were injected above the third nodes  only the upper portion of the canes will be affected.  The rhizome structure will survive to propagate. 

This may suggest that injection applications made above the second internode region are unable to completely translocate herbicide to the roots prior to disruption or collapse of the conductive tissue. This phenomenon occurred in the spring time when most photosynthate is moving up in the plant as opposed to later in the year as photosynthate is being sent to the roots and rhizome structures. 

How effective?
Where application rates were maintained at the recommended 5 cc’s per injection, a control rating project-wide was 98% control.

In the course of making applications, occasionally stems will be overlooked and not treated, but the use of lower rates will require additional significant human and financial resources to be used to obtain satisfactory results. Follow-up is a key element of successful removal of any invasive species. Using the recommended injection rate plus careful application techniques will produce the best results..

Bohemian Knotweed will overtake this road.

3 thoughts on “Stem Injection

  1. We have an older model of JK injector (I bought mine in 2019) but I can’t seem to get it to inject any liquid. Can you send me a detailed diagram of how to assemble it properly (it fell apart) and how you can help me get it to work? There’s no suction. It’s possible a spring or something fell out but nothing is clogged and water seems to run through all the parts.

  2. We are having the exact same issue with ours. A detailed cleaning or instruction video or diagram would really help.

  3. Greetings. Thank you for your comments! Please view the two documents under the Garden Gun menu of ‘Service the JK100’ and ‘JK1000 Instruction Manual’. These can walk you through assembly and service steps. I am shooting new videos for self service now and should have them up in the same section by 9/1/2021. NOTED: The gun does require new grease each season to keep the seals lubricated. The high salt content of herbicides will degrade seals quickly if it dries in the tool. We can service the tool or get you the parts to do it yourself. The seals and the grease are on our site for purchase. Thank you again for using our tools and supporting our company by taking the time to comment. -Brian

Leave a Reply

Your email address will not be published.