The from the external ecosystem which can harm ecosystems,

The presence
of indigenous plants
species are substantial associated with preservation of the ecosystem. However, native plants species can be threatened or even vanish by the appearance of invasive plants species that can alter an ecosystem. Invasive plants
species are arrive from the
external
ecosystem which can harm ecosystems, the environment, economic deprivation, and adversely affect of biodiversity and human sanity. It registered 123 types of invasive plants in Indonesia (Regulation of The Ministry of Environment and Forestry,
2016). The emergence species of Acacia
nilotica in Baluran National Park, East Java is
one of
the instance of invasive plants. Qirom et al (2007) stated
that almost 150 ha from 10.000 ha of this conservation area has not been invaded by this plants.
They are pressure effect of pristine plants and animals that live on there.
The Impact of invasive species are not only in ecological,
but also sosioeconomic and human health (Reaser et al., 2007). Kaufman & Kaufman (2012) declared
that invasive plant species can controlled by three ways: biological, chemical
and mechanical methods.

            First, biological control is involves genuine natural competitor. However,
the benefit of this techniques are minor hazard, no insusceptibility and no peril to human fitness and the environment (Kaufman &
Kaufman, 2012). In contrast, the negative side of this ways are
extremely spesific on biological agent for each target type, can not omit all
invasive plant species and require a long term.

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            Secondly, chemical control is utilize chemical
material particularly herbiside  that are
either destroy target plants or permeated into the plants. The advantage of
this means are appropriate equipment
for narrow scale of invasive plants, murder mentioned plants, and deficient of work
force. In contrast, the disadvantages
are expensive, chemical residues causes unsafe widely impact on the
environment and must be carefully and properly in applying it. Taking compound of management,
both chemical and non chemical will decrease the danger of herbicide (Kaufman & Kaufman, 2012). In Beltsville,
herbicide glyphosate is fit used to hold the reins of Circium arvense as
invasive plant (Ziska et al., 2004).

            Finally,
mechanical control is applied with choping plants,
excavating, or incenerating. The
profit of this method are cheap,
can be used in reachable areas, and diminishing seed yield. The risk
of this way are need many manpower, land disruption, some invasive plant s are kind
adjusted to flame (Kaufman &
Kaufman, 2012). In America, fire
is applied to mechanical control of 
invasive plants (Brooks et al., 2004). On the other hand, to restrain
Acacia nilotica in Baluran National Park, East Java by
using a tyrfor tool is more proper than
manual removal. However, this way has an impact on ground level shift of 1% / m2
/ tree (Basari, 2012).

            The conclusion of this opinion claimed
that biological control is the prime method of managing invasive plant
species because it is secure, long period restraint system selection for ecosystems at a lowest charge.