Practice Questions

1. Phytophthora is a microscopic  _____________.
   1. fungus-like organism
   2. bacterium
   3. virus
   4. nematode
   5. none of the above
      
      
2. Phytophthora species cause diseases on ____________.
   1. vegetable crops
   2. forest trees
   3. nursery crops
   4. fruit and nut trees
   5. all of the above
      
      
3. Phytophthora survives extreme hot, dry, or cold conditions by producing ________.
   1. thick-walled spores
   2. zoospores
   3. apothecia
   4. hyphae
   5. all of the above
      
      
4. Which single factor is most important in the Phytophthora disease cycle?
   1. nitrogen
   2. water
   3. salts
   4. sugars
   5. sunlight
      
      
5. The first symptoms of Phytophthora disease are________________.
   1. easily seen with your eyes while walking plant rows
   2. may be below ground and/or under the bark
   3. always on the leaves
   4. always on the roots
      
      
6. Diseased plants in the field _________________.
   1. usually do not occur in a uniform pattern
   2. usually do occur in a uniform pattern
   3. all die
   4. get better after the affected leaves fall off
      
      
7. You can tell which species of Phytophthora is infecting your plants by ________________ .
   1. observing the roots
   2. submitting a sample to a diagnostic laboratory
   3. observing the leaves
   4. using a field diagnostic kit

True/False Questions

8. Phytophthora is the most important disease of nursery plants nationwide.
   
   
9. If the top of the plant looks healthy the plant roots are healthy as well.
   
   
10. No other problems cause symptoms similar to Phytophthora.
    
    

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