Lecture 07-08 2010

Lecture 07-08 2010 - Biological Control of Weeds Principles...

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Biological Control of Weeds
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Principles • Primarily a tool for use in non-crop areas • Does not eradicate a weed – Requires some pests be left as hosts for the biocontrol agent to complete its life cycle • Organisms releases much be monophagous (host specific), not polyphagous – Generally effective against a single organism • Presumes that the invasion of a species in a non-native region is consistent with the Enemy Release Hypothesis
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PLANT GROWTH Goal of a Classical Biological Control Program Threshold level of damage
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Risks of biocontrol • Mongoose to control rats in the tropics Rhinocyllus conicus for control of musk thistle and other thistles
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Two species of Asian carp -- the bighead and silver -- were imported by catfish farmers in the 1970's to remove algae and suspended matter out of their ponds. During large floods in the early 1990s, many of the catfish farm ponds overflowed their banks, and the Asian carp were released into local waterways in the Mississippi River basin. Asian carp
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Process - Overseas • Surveys – Lists of potential agents • Field records – Host-specificity – Damage potential • Host-specificity Testing – Initially conducted in native range – Less expensive and specimens available
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Process - Quarantine Safe? Host-Specific? – Feed & develop only on target plant Assess Agent Potential Gather Information – Release petition – TAG request Environmental Assessment?
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• Approval comes from APHIS, PPQ – Animal and Plant Health Inspection Service – Plant Protection and Quarantine • APHIS, PPQ solicits recommendations from
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This note was uploaded on 03/05/2010 for the course PLS PLS 176 taught by Professor Fischer during the Winter '10 term at UC Davis.

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Lecture 07-08 2010 - Biological Control of Weeds Principles...

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