Urochloa humidicola– Tully grass- Introduced pasture grass!
Just last weekend a Land for Wildlife Assessment was on a property with a lot of this grass. This is not a declared weed but can outcompete native plants in wetter areas and its presence is goring in the rural area of Darwin. I dug out this short article that Pete Mcfdden, a weed contractor that works in the area wrote last year- (and hope to get some better photos soon!)
Another introduced pasture plant gone feral is the introduced species Humidicola. Present on many road verges in the rural areas it forms a dense stoloniferous mat and as an environmental weed can invade undisturbed bush land. Favouring wet areas it has even been considered as a “choking plant” to control Mimosa pigra.
Humidicola stays green most of the year and when it burns it produces very dense smoke that reduces visibility to almost zero. Humidicola has a thick root mass to feed underground fires that can burn for days until they break through the surface, producing new runaway wildfires. The ground can become so hot that it sterilises the soil, destroying other plants and seeds (NT Bushfire Volunteers)
The main mode of distribution is by root stolon growth and the plant steadily creeps along. Seed production is reportedly limited at lower latitudes and the vegetative reproduction is the main mode of propagation /spread.
Control with Glyphosate is effective but does require good coverage of all leaf areas and may require a follow up application. Recent experience at McMinns Lagoon Reserve confirms that control can be achieved in one season and no regrowth has been recorded from soil seed-banks or reshooting. As Humidicola prefers wet and innundative areas control is best achieved early in the wet season when access is easier.
When using any herbicide please read the label and use any appropriate personal protective equipment required.