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Key advantages of an effective GIS/GPS survey and brought against the landowner. Top priority should be
management strategy will enable: given to treating infestations which have migrated or are
The Financial impact of invasive weed control to be
likely to migrate into neighbouring properties.
reduced or controlled 3. Highway Safety
The Environmental impact of control to be reduced Japanese knotweed blocking sight lines on the highway
through prioritisation and effective environmental would implicate the landowner as liable in the event of a
assessment, the objective being efficacy in chemical road traffic accident. The situation should be avoided and
control given high priority for control.
Adherence to the Legal obligation for invasive weed On large estates, knowing which invasive weed species
control to be demonstrated through monitoring are growing, and where, can be a challenge. Completing a
the treatment programme against the initial survey. GIS/GPS survey combined with a bespoke database and
To illustrate the need for accurate surveys using GIS/GPS
the development of a strategic management plan will
systems there are three situations which landowners
ultimately help eliminate or reduce the threat that specific
should seek to avoid:
infestations represent.
1. Threats to human health.
In the context of large scale invasive weed management,
utilising GIS/GPS systems to implement a control
Take the example of Giant hogweed in the grounds of a
programme should be a natural progression after
primary school; this can have serious consequences for
completing the survey and management strategy. Treatment
the landowner. Giant hogweed’s clear watery sap causes
can be readily targeted. An effective invasive weed strategy
painful blistering if it comes into contact with human
is wholly dependant on the ability of the field technicians
skin, which can take several years to heal. The importance
to implement the desired objectives of a management
of knowing where Giant hogweed is growing cannot be
strategy as originally intended. To do this and to ensure
over-stressed so a clear strategy for its control is vital.
success, they need clear instructions and to know what is
Schools and accessible public open spaces are good
required, when it is required, where and how. This is
examples of priority areas where this weed must be
where GPS/GIS handheld computers with
eradicated.
properly developed databases come into their own. The
2. Migration through properties person implementing the control programme can navigate
Allowing Japanese knotweed to migrate into neighbouring
to the invasive weed infestation with ease and undertake
property could culminate in legal proceedings being
the prescribed tasks from information provided on the
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