Talk title: Integrated Vegetation Management on Infrastructure Corridors

Vegetation management across Australia’s infrastructure corridors is becoming more
challenging as vegetation becomes stronger, more persistent and harder to control. For
many years the standard approach has been slashing and mowing supported by
glyphosate intensive knockdown spray treatments. These programs provide a temporary
solution, but they do not change the conditions that allow vegetation to come straight
back. Australian research over the past decade, including peer reviewed studies by
vegetation management researchers and operational field trials by IVM practitioners,
has shown how repeated slashing, mowing and glyphosate use affects corridor
vegetation and why this approach fails to deliver long term outcomes.

Research across mown and sprayed systems shows that vegetation which can recover
quickly becomes dominant over time. The repeated disturbance created by slashing
and mowing opens space for vegetation that grows aggressively, responds well to
disturbance and can tolerate repeated herbicide treatments. Softer and easier
vegetation declines while species that are harder to control steadily increase. The
research also shows that when the same knockdown herbicide is used season after
season, the vegetation community slowly shifts towards species capable of surviving
that treatment. This is one of the recognised pathways leading to reduced effectiveness
and the appearance of vegetation that becomes more expensive to manage.

Operationally this creates significant challenges. The vegetation becomes less
predictable, and the knockdown spray program must be escalated or adjusted to
remain effective. Intervals between required treatments become shorter and the
corridor becomes more aggressive, increasing fire risk, reducing visibility and affecting
safe access for maintenance crews. These issues occur consistently across roads, rail
formations, gas easements and power corridors, regardless of climate or region.
Without a different approach the cycle repeats, budgets increase and outcomes remain
unstable.

Integrated vegetation management provides a solutions-based approach that delivers
long term improvements rather than short term suppression. The integrated model
brings together selective herbicides, pre-emergent chemistry, growth regulation,
vegetation transition strategies and targeted intervention. These tools are applied at
different times to influence the vegetation through its growth cycle. When used
correctly they reduce future pressure, promote more manageable vegetation and build
predictable program cycles that reduce operational risk. Australian field programs
guided by research have shown that integrated vegetation management delivers fewer
interventions, improved corridor condition and reduced cost across multiple
infrastructure types.

Education and capability uplift remain essential. Research and field audits show that
program success is strongly linked to fundamentals such as product selection, mixing
order, spray technique, timing, water quality and understanding how vegetation
responds to treatment. Many poor outcomes come from these basics rather than from
herbicide resistance alone. When contractors and asset managers have the capability
to diagnose vegetation behaviour and apply the correct tools, program outcomes
improve significantly.

Asset inspection is also central to designing effective programs. Understanding species
composition, access constraints, environmental overlays, service level requirements
and operational risk allows vegetation programs to be tailored to each corridor. Regular
inspection ensures treatments remain aligned with site conditions and contractual
requirements.

The future of vegetation management in Australia lies in wider adoption of integrated
vegetation management supported by improved inspection tools, digital mapping,
better diagnostics and contract models that reward long term outcomes rather than
short term activity. Australia now has the research foundation, operational knowledge
and practical experience to move from reactive vegetation management towards
solutions that deliver sustainable outcomes across the nation’s infrastructure corridors.