The Stem Injector Kit consists of a handheld compression sprayer (7.6L or 4.7L), the Dosimeter and Stem Injector Needles. The image shows the kit with the 7.6L Compression Sprayer. To see the 4.7L click here.

The kit enables targeted and precise doses of herbicides such as glyphosate and pesticides to be directly injected into the stems of plants such as Japanese knotweed, Himalayan balsam and giant hogweed.

Injecting Japanese knotweed with weed killer has been proven to be an effective solution for controlling this highly invasive and fast growing plant. In a study carried out for the National Trust, a ‘cut and inject’ method was trialled and shown to have a ‘kill’ success rate of up to 95%. The benefits of using the injection method included:

• protecting the surrounding environment
• could be used near watercourses where foliar spraying is not permitted
• a reduction in herbicide used. While the concentration of glyphosate used in injecting is higher than used in foliar spraying, the highly targeted nature of the process means only a very small mount needs to be injected into the stems, reducing overall usage.

Read the study here.

Use with Round-up Pro Vantage 480 to combat Japanese knotweed at a rate of 2ml per stem. Buy Round-up Pro Vantage here.

The Dosimeter and Stem Injector Needle can also be purchased below for use with any of our other Guarany backpack sprayers.

The Dosimeter allows for highly accurate and consistent volumes of fluid to be delivered with each squeeze of the trigger. Benefits of the Dosimeter include:

• Can be calibrated to deliver between 2ml and 25 ml of fluid per stroke
• The same fluid is delivered regardless of backpack pressure
• Improved safety for the operator as the spray is directly only at the plant
• Gives completely consistent dosing
• Reduced chemical waste

The needle set comes with two needles, a 25mm and a 60mm. They are made of copper and brass and have fittings to attach them to the Dosimeter. They can also be bought separately here.

BL 103451 – Guarany Dosimeter
BL 100523 – Guarany 7.6L compression sprayer
BL100443 – Guarany 4.7L compression sprayer
BL106486 – set of needles

To see how the Stem Injector works, watch our video below: