RFI - Rehabilitation Management Plan

WEED MANAGEMENT
Weed cover in the rehabilitation area is sparse, consisting of species such as lantana (Lantana camara) and Guinea grass
(Megathyrsus maximus var maximus). Any infestations of invasive plant species listed under the Biosecurity Act 2014 (Qld) or
the Biosecurity Plan for the Noosa Council that will adversely impact the rehabilitation plan are to be treated prior to the
commencement of works.                                                                                                                 METHODS                                                                DETAILS
                                                                                                                                     Complete          This technique is used for plants, which regrow from bulbs, tubers or other plant parts, such as runners. Remove
Broad-scale herbicide application (e.g. blanket foliar spraying) is not suitable due to proximity to sensitive native vegetation.    Removal           all plant parts, including roots by hand pulling.
Where possible, targeted weed control (e.g. spot spraying) should be carried out in consideration of seasonal variations in                            Plant parts should be removed from the site and disposed of via landfill or composting.
                                                                                                                                     Stem scraping     This method is suitable for treating small shrubs and vines with thin and relatively soft bark tissue, which a
rainfall and weed growth, flowering times and treatment affectivity. Care must be taken to minimise the occurrence of off-target
                                                                                                                                                       reactively growing and not stressed. Stem scraping or scrape and paint is perfect for treating vine species,
damage to native species through spray-drift.                                                                                                          especially Madeira Vine. The aim of this technique is to remove a small portion of the bark. This will allow the
                                                                                                                                                       herbicide to penetrate into the plant’s sapwood travelling to the tubers and effectively destroying the plant.
Weed removal/treatment should be undertaken as part of monitoring requirements and/or routine maintenance activities and
                                                                                                                                                       Using the knife, scrape away 100 mm to expose the sapwood. Immediately (within 15 seconds) apply the
are to be controlled on an ongoing basis as needed during the 1-year maintenance period. Any other significant infestations                            herbicide to the exposed stem. Failure to apply the herbicide immediately will result in the plant sealing itself off
of priority environmental weed species are to be treated to minimise the risk to the long-term survival of revegetation plantings.                     and not all the herbicide to effectively penetrate into it.

Weed control techniques are described in Table 1.                                                                                    Cut Stump or      This method is a quick and effective way of treating small shrubs, large trees, woody plants and vines without
                                                                                                                                     Cut and Swab      aerial tubers. This method allows accurate placement of the herbicide with minimal hazard to the environment
Details on the preferred control techniques for the weed species present or potentially present on site is provided in Table 2.
                                                                                                                                                       and the operator. The intention of this method is to apply the herbicide to the actively growing plant sapwood.
Legal Requirement for Declared Weeds Species                                                                                                           The herbicide will move through the plant into its roots and effectively kill it.
                                                                                                                                                       Using the saw, machete, cane knife or secateurs, cut the plant at least 150mm above the ground. Immediately
The Biosecurity Act 2014 imposes a ‘general biosecurity obligation’ (GBO), which imparts a responsibility on all individuals or                        (within 15 seconds) apply the herbicide to the base of the stump. Failure to apply the herbicide immediately will
organisations to manage biosecurity risks that are under their control and that they know about or should reasonably be                                result in the plant sea ling itself off and not all the herbicide to effectively penetrate into it.
expected to know about. Under the GBO, individuals and organisations whose activities present a biosecurity risk must take           Stem Injection    This method is suitable for treating shrubs and trees with a diameter of greater than 100 mm that a reactively
                                                                                                                                                       growing and not stressed. It also allows accurate placement of the herbicide with minimal hazard to the
all reasonable and practical steps to prevent or minimise their activities from causing a biosecurity event (defined as an event                       environment.
that is, was or may become a significant problem for human health, social amenity, the economy or the environment, and is                              Using a drill, small axe, chisel and hammer or machete, cut downward at an angle of 45 degrees through the bark
was or may be caused by a pest, disease or contaminant).                                                                                               into the soft sapwood below. If using an axe/machete/chisel, immediately (within 15 seconds) roll the back of the
                                                                                                                                                       blade downward, opening up a pocket in which to apply the herbicide mixture. Using a brush, spray or syringe,
The Act lists fauna and flora pest species as either prohibited or restricted biosecurity matter:                                                      immediately (within 15 seconds) apply the herbicide mixture to the exposed sapwood of the cut. Note, that it is
                                                                                                                                                       essential that cuts penetrate the bark and get through to the light sapwood underneath, otherwise herbicide
•    Prohibited matter is any species that has not yet become established in Queensland and would have significant adverse                             treatment may be ineffective. Depending on the size of the tree, several cuts/injections ma y be required.
     impacts on human health, social amenity, the economy or the environment if it entered the state.                                Basal bark        This method is suitable for treating thin-barked woody weeds and trees that a reactively growing and not stressed.
•    Restricted matter is any species that is already established within Queensland and has significant adverse impacts on           spraying          Using this technique, the stem or trunk must be sprayed with oil-soluble herbicide (e.g. Biosafe) from ground level
     human health, social amenity, the economy or the environment. Restricted matter is categorised into 7 risk-based                                  to a height of 300mm.
                                                                                                                                                       Using a brush and starting a t the base of each stem, paint all the way around each stem to a height of 300 mm.
     categories. Some species can be categorised under a range of different categories.
                                                                                                                                                       To allow herbicide uptake, ensure the treated area is not disturbed for 24 hours. Note that, depending on the
Weed species listed as either Prohibited or Restricted, if identified on site, will need to be treated in accordance with the                          species, this technique can take up to two months to get results. Application to large trees, may result in the death
                                                                                                                                                       and shedding of branches which may pose a hazard. As such this method is not recommended in areas where
recommended control techniques outlined in Tables 1 and 2.
                                                                                                                                                       branches could cause damage.
                                                                                                                                     Foliar spraying   This technique is suitable for treating grasses, herbs and shrubs up to 6 metres tall and involves spraying individual
                                                                                                                                                       and small clumps of weeds with diluted herbicide.

                                                                                                                                                       Avoid spraying on rainy or windy days and make sure the plants a reactively growing. Ideal conditions for spraying
                                                                                                                                                       are immediately after rain and once all the dew has evaporated. In terms of application technique:
                                                                                                                                                       1. Spray close to the target plants to a void spray drift onto other valuable (i.e. native) plants.
                                                                                                                                                       2. Spray to cover all leaves and stems to the point of visible wetness.
                                                                                                                                                       3. Use short sweeping strokes.
                                                                                                                                                       4. Use frog friendly adjuvant/surfactant (such as Nufarm Bonus®).
    Table 1: Weed Control Technique Descriptions.                                                                                                      5. Start from the far corner of the infestation working away from sprayed areas.
                                                                                                                                                       6. Be systematic to avoid spraying the same area twice.
                                                                                                                                                       7. Use Dye marker (such as Herbicide) to aid with targeted application of herbicide as required.



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 Paul Desouza                                        RMP1_Rev A                                                                                                                                                                  ABN: 20 162 130 627