Module 2: Disease Management
Module 1: Biology, symptoms, and Diagnosis
Welcome Module 3: Phytophthora ramorum Conclusion Take the Exam Further Information


Disease Cycle










Practice Questions

  1. Phytophthora ramorum is subject to regulation because:
    1. It represents a serious threat to forests
    2. It infects many species of plants
    3. Infected nursery plants could spread the disease to other parts of the country
    4. All of the above
  2. Phytophthora ramorum can cause all but one of the following symptoms on nursery plants:
    1. leaf spots
    2. powdery white spores on the leaf surfaces that are visible to the naked eye
    3. discoloration of the leaf midrib
    4. defoliation
    5. stem discoloration
  3. Phytophthora ramorum forms the following structures:
    1. sporangia
    2. zoospores
    3. chlamydospores
    4. all of the above

True/False Questions

  1. Phytophthora ramorum cannot infect roots of nursery plants.

  2. Phytophthora ramorum can be spread from plant to plant by water splash.

  3. The best way to avoid contamination by  Phytophthora ramorum is to prevent it from getting in to your nursery in the first place.

  4. One of the typical symptoms of Phytophthora ramorum on rhododendron plants is the symptom of “bleeding”.

  5. The goal of the “Confirmed Nursery Protocol” is to limit the spread of Phytophthora ramorum in your nursery and to find any infected plant material inadvertently shipped as quickly as possible.
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