soil - tweed shire · control and soil health. weed invasion & management options biological...
TRANSCRIPT
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SOIL
Practical,
Low-cost
Weed
Prevention
Bio-control
Issues
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Pasture Management for Weedy Sporobolus Grasses and Fireweed
Control and Soil Health
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Weed invasion & management options
Biological control is usually utilised during this phase
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Benefits of biological control
▪ Control is usually specific to the target weed
▪ Environmentally friendly and non-toxic
▪ Self perpetuating once established
▪ Long term control
▪ Effect not restricted to one area
▪ Long term cost is low with high benefit/cost ratios
▪ Good against weeds where other control methods are non viable or prohibitive
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Limitations of biological control
▪ Initial research when introducing a new agent may take several years to complete resulting in high short term cost
▪ Long term commitment to a program usually requires Government or other funding agency support
▪ The release of natural enemies may raise unreasonable expectations resulting in the abandoning of existing control measures
▪ In Australia, substantial or useful reduction of the target weed only occurs in two thirds of long term programs
▪ Cannot be commercialised
▪ In some cases native species have become dependent on the target weed - for example frugivores and weedy species with berries as fruit
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Common misconceptions about biological control
▪ There is a biological control solution for every weed or pest syndrome
▪ The impact of biological control will be the same as that of using synthetic pesticides
▪ Biological control will yield immediate results
▪ There will be no adverse (e.g. “off-target”) side effects
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Classical biological control – managing weed impactsP
op
ula
tio
n d
en
sity
Time
Agent density
Weed density
Damage / economic threshold
Desirable vegetation density
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What Parra Soil Trooper Is
A pure source of Nigrospora oryzae
A beneficial soil fungi
A natural microbe
Produced locally from local fungi
What Parra Soil Trooper Isn't
A herbicide
Harmful to animals, native or commercial plants
A ‘silver bullet’
An aproved bio-control for GPG & GRT
Toxic
SOIL
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What is it?
SOIL
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Spores and Hyphae
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How do I Use it?
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Mix it
Strain it
Spray it
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When do I Use it
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Does it Damage Pasture?
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Giant Rats Tail Grass
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THE END
QUESTIONS?