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Basics of Weed Management Nelroy E Jackson Basics of Weed Management Prevention and Quarantine Prevention and Quarantine The simplest way to battle invasive weeds is to prevent their entry into your sphere of influence.

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Basics of Weed Management

Nelroy E Jackson


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Basics of Weed Management

  • Prevention and Quarantine


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Prevention and Quarantine

  • The simplest way to battle invasive weeds is to prevent their entry into your sphere of influence.

  • Yard, Roadside, City, County, State or Federal Park, Natural Area, Forest.

  • Jurisdiction – State, Federal


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Prevention and Quarantine

  • State Noxious Weed Law

  • Federal Noxious Weed Law – The Plant Protection Act.

  • Interstate Movement and Commerce

  • Imports into the United States

  • Codes of Conduct


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Prevention and Quarantine

  • Impact on the Nursery Trade

  • Economic Costs of Invasive Plants

  • APHIS

  • CDFA


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Prevention and Quarantine

  • Pathways of Entry

  • Intentional and Unintentional Introductions

  • Tourists, Workers

  • Shoes, bicycles, pets

  • Vehicles – passenger and commercial

  • Hay


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Prevention and Quarantine

  • This is a two-way street!

  • The United States of America has given invasive species to other continents.


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Basics of Weed Management

  • Chemical Control


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Chemical Control

  • Contact vs. Systemic

  • Selective vs. Non-Selective

  • Preemergence vs. Postemergence


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Contact vs. Systemic

  • Contact herbicides act on the part of the plant where the spray solution lands.

  • Systemic herbicides move within the plant to act on plant parts away from the point of deposition


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Selective vs. Non-Selective

  • Selective herbicides tend to kill or damage a type of plant while other types of plants are tolerant to them.

  • Non-Selective herbicides tend to kill all types of plants.


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Preemergence vs. Postemergence

  • Preemergence herbicides are applied to soil before a plant germinates and acts by preventing the emergence of the weed.

  • Postemergence herbicides are applied to extant vegetation and damage the plants

  • Some herbicides have both preemergence and postemergence activity.


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