This is a technique promoted by Bill Chisholm of Wilding Pine Control Ltd for small/medium sized trees in places which may be difficult to access. For chemical details go to www.chisholm.co.nz and refer to the Manual (download click here) for further comments, safety and audit recommendations.
This method can be useful on scattered, medium-sized trees on stony ground or with multiple stems. Vigilant Gel is proven and safe – but expensive. Metsulfuron, applied at 20g/litre is much cheaper, but its guaranteed effectiveness has yet to be confirmed. Recently, a 20% Grazon in oil/diesel, has given good results on contorta pine (P. Raal, pers comm.), but once again, more time is needed for confirmation. Refer to the Manual (for download click here) for further comments, safety and audit recommendations.
Root uptake and cut stump treatment