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Biological Control

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Biological Control Introduction and management of selected natural enemies of a weed. Biocontrol When weeds run amok! Not the total solution but – PowerPoint PPT presentation

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Title: Biological Control


1
Biological Control
  • Introduction and management of selected natural
    enemies of a weed.

2
BiocontrolWhen weeds run amok!
  • Not the total solution but
  • Economical
  • Self-sustaining
  • Environmentally safe

3
Downside
  • New BCA introduction 1 in 3 in three chance of
    success.
  • Slow process
  • Efficacy is highly variable.
  • Monitoring is required Just cant walk away

4
Successes
  • St. Johnswort (Klamathweed) (Chrysolina Beetle)
  • Tansy ragwort (Ragwort flea beetle)
  • Rush skeletonweed. (Puccinia rust)

5
Emerging Successes
  • Leafy spurge
  • Diffuse knapweed
  • Purple loosestrife
  • Yellow starthistle.

6
BCA Impacts on Weeds
  • Direct - destroys vital plant tissues and
    functions.
  • Indirect - impact increases stress on the weeds,
    which may reduce their ability to compete with
    desirable plants.

7
Integrating Biocontrol
  • Reduce weed populations
  • Not eradication
  • Competitive plantings may be used to compete the
    weeds.
  • Part of the tool box

8
Biocontrol Programs are
  • Not silver bullets
  • Good for hard-to-treat sites
  • Not for the impatient.

9
Biological Control Programs need
  • Consistent Funding
  • Expertise
  • Cooperation

10
Biocontrol Advantages
  • Reduction of herbicide residues in the
    environment,
  • Host specificity on target weeds
  • Long-term self-perpetuating control
  • Low cost per acre
  • Resistance management

11
Biocontrol - Disadvantages
  • Limited availability native homelands
  • Dependence of control on plant density
  • Slow rate at which control occurs
  • Biotype matching
  • Difficulty of conflicts over control of the weed
  • Host specificity when host populations are low.

12
Release Sites
  • Large, contiguous infestations facilitates
    spread.
  • Fit the ecological needs of the biocontrol
    agent
  • Easy access but also protected and undisturbed.
  • Minimum of 5 year project (preferably 10)
    years.
  • Land owner agreements in writing
  • Well marked, photographed and mapped

13
Biological control agents are living entities and
require specific conditions to survive.
  • http//www.mtwow.org/Bio-Control-main.htm
  • http//mtwow.org/leafy-spurge-biocontrol-links.htm
    l
  • http//www.bio-control.com/products.asp
  • http//www.extension.unr.edu/Weeds/Biolcontrol.htm
    l
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