Effect of foliar herbicides on emergent bogmoss (Mayaca fluviatilis Aubl.) in north Queensland, Australia

Abstract

Bogmoss (Mayaca fluviatilis Aubl.) is an exotic perennial aquatic plant that can grow fully submerged, in the form of semi-floating mats, or as a semi–terrestrial plant on wetland margins. Infestations of bogmoss have been found in several locations within Queensland and New South Wales. In tropical north Queensland, the weedy potential of bogmoss is demonstrated by its formation of monocultures and subsequent blocking of agricultural drains and natural water courses, resulting in flooding and damage to infrastructure.

Control options for management are limited with many challenges to controlling weeds in flowing aquatic systems. To increase the management options we tested the effectiveness of five herbicides on emergent bogmoss growing in large tubs in a glass house. The herbicides tested are all registered for use within aquatic situations. Although the water was not running, this was the closest practicable set-up to test the effect of the chemicals on emergent bogmoss.

We found that all herbicides tested were able to achieve high mortality of bogmoss, within 15 weeks, however, ProcellaCOR® and Reglone® showed the best results for overall reduction of living biomass. Further investigation would be required to see if the successful results in tubs would transfer across to real-life moving water situations.