The VBT had received enquiries about unsatisfactory results of Glyphosate. We asked people to give us their experiences using this chemical. The comments centred around poor control rates, the need for constant follow up, increased resistance, off target kills and improved conditions for weed invasion.
Bruce Marsh from the Merton to Cathkin Blackberry Action Group has sprayed on his property for a number of years with Glyphosate, according to the label, ‘I noticed that blackberries I sprayed regrew and needed follow up the next year. The chemical seemed less effective in following years’. Bruce said. ‘The Merton to Cathkin Blackberry Action Group’s project officer suggested I try other chemicals, Triclopyr and Picloram, and results have improved remarkably’.
As Glyphosate is non-selective it can kill non-target species. Matt McEachran, Sandy Creek Woody Weed Action Group’s project officer has observed poor control rates on blackberry while at the same time killing other species such as Dianella, Bursaria, Acacias and summer growing themeda triandra, leaving bare ground which often recolonises with weed species.
Project officer Cam Paterson from Up to Us Blackberry Action Group said that there is a glyphosate product which is registered for use around waterways however it will kill non target species including reeds and sedges. In other areas he uses Metsulfuron-methyl as this product has less impact on other species and a higher level of control on Blackberry.
Advice should be sought from your Rural Supplier about the most appropriate method of controlling your blackberry and always consider the OHS aspects of using chemical. The Blackberry Control Manual, available on the VBT Website, is a recommended resource.