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.
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..