We are testing prototypes of a new rhizome injection system for use on plants such as Japanese knotweed (Fallopia japonica).
We have done preliminary tests with the rhizome injector. A key aspect of the system is that aerial shoots do not have to be
living in order to make an injection. (as this injection in winter shows!) The injection is into the “green node” which is underground in the rhizome.
We have had encouraging preliminary results but need to have more rigorous testing especially with outside experts. Potential advantages of the method include:
- injections could be made when the aerial shoots are dead – lessening worries about disposal of living plant parts;
- injections are directly into the rhizome – the part of the plant that needs to be killed for long-term success;
- amounts of herbicide used can potentially be less – We have thus far used approximately 2 ml per plant (Aquamaster (54% ai glyphosate diluted slightly with 0.15% colorant);
- injections could be made at times of the year that are less busy; and
- it may be possible (not confirmed) that fewer aerial shoots can be treated if injection is deep enough into the rhizome and herbicide then translocates to a greater number of shoots.
As of January 30, 2012, we are seeking six testers who have:
- treated Japanese knotweed before;
- used injection and foliar methods;
- access to test areas with mature Japanese knotweed stands;
- the ability to make at least 3 applications at different times of the year (including spring (before aerial shoots sprout), late summer, and late fall (after die-back of aerial shoots); and
- the ability to complete a short test summary with photos.
There will be no cost to the testers and testers can keep the prototype. If you are interested in finding out more, please contact me at john at greenshootsonline dot com.