I have spoken to your customer service person last year when I first attempted to use your eco-friendly weed control last year to clear up 2 drainage ditches infested with Japanese Knotweed, which had long ago been planted by neighbors.
Your Rep. gave me some good ideas when I talked to him on the phone, and I'd like to thank him and 'spread the word.
Spraying your product on foliage several times in the season, accompanied by hand digging, did give fairly good control, but it (of course) was coming back. Then one day I was examining a knotweed, and noticed its stem is a tube with water tight septum every foot of so. I had limited luck trying to drill into the main rhyzome, and drenching it. Then I lopped off the top of one, and poked a wire thru the septum, and sprayed some of your product in.
Within two weeks all the stem above the 2nd septum was gray, slimy, and dead, but still holding the mixture. I found a 1/4"x1/4" steel rod with a sharpened end. This worked well for poking down thru the 2nd and 3rd septum, and your remnant product dribbled another foot and a half down. I am waiting to see if it also kills that part of the main stem down to the ground.
Please let me know if other farmers are experimenting with directly injecting your product into the stems.
I'm glad to hear that you experienced better results. As you know, A.D.I.O.S. could be a good tool in the toolbox but sometimes we need more than one tool to achieve our goal. Drilling and poking are among them!
To answer your question, stems injection is very exhaustive and can only be done on mature plants. Also we found that it is not as efficient as a foliar application to reach the tips of the rhizomes especially a few weeks after a cut. A thirsty plant will absorbed more solution than an injured one.
Injection in the stems tend to stress out the plant and lead to vascular shutdown. If you kill the base of the roots to fast, it may break apart from all the small rhizomes attached to it. Bottom line, new comers will pop out eventually.
Remember, when it is coming back, it is usually a new extremity of the clone and not the one targeted before. Foliar spraying is then recommended on new comers. No pulling or digging.
The idea is to fool them using alternative methods. Cut, foliar spray, root injection according to their status.
Another good tool but expensive would be a root feeder. The results are better cause they force the solution deeper in the ground next to the root system. However they cannot work into very compact soil. So drilling is a good way out.
Like they say, whatever makes your boat float.
Thanks a lot for sharing. I would love to learn a bit more over phone in the near feature. Call me anytime.