Stem Injection

steminjectionStem injection delivers 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. This method dramatically increases the translocation ability of the herbicide throughout the plants root system and is key to controlling invasive species with large rhizome structures. 

With this method there is no need to cut canes, or handle viable plant material for disposal. Canes too small to inject can be injected upon secondary follow up visit. 

 When? Injections can be made anytime during the growing season.

What to use? 

Glyphosate is the primary herbicide for use in control of knotweeds.  An Active Solution of at least 41%  Glyphosate is required.   Many Stores carry Glyphosate at lower percentage active ingredient, but for stem injection you need greater than 41%.  

Imazapyr is also effective at 6mls per cane.  Operators must be aware of risks to cross-root transfer of the herbicide.  Because knotweed creates a monoculture this risk is low.  Most knotweed stands will not have any other plants growing under their canopy.  

PRODUCTS (USA):  Aquamaster.  Rodeo.  Imazapyr.  Roundup Super Concentrate. Polaris


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.  


Bohemian Knotweed will overtake this road.

1 thought on “Stem Injection

  1. Hi,

    I live in Quebec, Canada and I bought a house that has japeness knotweed in my land. I want to fight the infestation as much as I can.

    I have tw oquestion for you:
    1. If I purchase the stem injector tool (JK 1000). Did in the past you sold in to another costumer that leave in Quebec, Canada? I’m trying to find if the border will refuse to let it trought because of regulation (the tool might be consedired to only be used by a professionnal with a permit).

    2. You are recommanding using a Glysophate with a least 41% actif ingredient in it. Since roundUp product are regulate in my country. The maximum product I can purchase is 41% AI. But the glysophate product you are refering has 50.2% AI. I want to be sure i’m looking at the proper data. The product I can bought is ” PCP Reg. No. 22759 monsanto” You can easily find the Safety Data Sheet PDF if you google that.

    Thank you for your help, really appreciate it

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