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.
Leave a Reply

Your email address will not be published.