Stump Control Using Roundup
Roundup has unrivaled operator and environmental safety profile, it is ideal for areas with public access or of environmental sensitivity
Timing
Trees must be dormant, this usually occurs between November and February, although in some seasons and in most Northern parts of the country this could extend until the end of March. Watch species like hawthorn and willow which start spring growth very early.
Rate
| Roundup ProBio | Roundup ProVantage | |
|---|---|---|
| Deciduous Species | 10% solution of Roundup in clean water | 7.5% solution of Roundup in clean water |
| Evergreen Species* | 20% solution of Roundup in clean water | 15% solution of Roundup in clean water |
* includes Rhododendron
Method
Application of Roundup must be made to a fresh cut so that uptake into the phloem is maximised. The most ideal situation is to use the Enso Clearing saw, which automatically delivers spray onto the cut surface.
Where a separate paintbrush application is used a two-man operation is often the most pratical for a quick post-felling treatment. If more than a few minutes of time have elapsed re-cutting the stump will restore the effectiveness of Roundup application. Uptake is almost immediate from a fresh cut and will be rainfast within 10 minutes. Application to a cut that has partially sealed means absorbtion is slow and rain within 6 hours will wash some of the product off.
Chemical Thinning
Neat Roundup is introduced straight into the phloem through a hatchet cut into the bark of the tree or stump. This has the benefit of not requiring the stump to be freshly cut, it can be used where trees have already been cut back, or where the tree is to remain in place. It is also easy to see which areas have already been treated
Rate
| Roundup ProBio | Roundup ProVantage |
|---|---|
| 2mls of neat product per 10cm diameter of trunk | 1.5mls of neat product per 10cm diameter of trunk |
A spot gun with a solid stream nozzle is recommended, it is advisable to make a second cut under the first to catch any surplus Roundup.
A cut for every 10cm diameter of trunk is needed, work out how many are required and space them evenly around the girth. e.g. a trunk of 30cm diameter required 3 cuts.
This method works from slightly earlier in the season (i.e. October), which may be useful to use before stump painting could commence in November.