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 (surfactant free) 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%.   Other herbicides have been reported to work but operators will want to verify with local application regulations. 

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

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.  

How effective?
Where application rates were maintained at the recommended 3-4 cc’s per injection,  control project-wide was 98%.In the course of making applications, occasionally stems will be overlooked and not treated. Follow-up is a key element of successful removal of any invasive species. Using the recommended injection rates plus careful application techniques will produce the best results..

Bohemian Knotweed will overtake this road.

6 replies on “Stem Injection”

Good morning. Do you push the needle completely through the stem as pictured before squeezing the trigger? Is dilution of the 41% glyphosate r5equired? If yes what is the dilution. Asking for knotweed & poison hemlock control.

The 41% is the minimum percent of the active ingredient. Do not dilute. The lower percent cheaper glyphosate products don’t work you need the good stuff. Push the needle all the way thru the cane. The hole in the needle is near the back. Orient the needle hole down so it injects downward filling the cavity.

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