Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 21, Problem 16RQ

An apple grower notices that several of his apple trees with fungi growing on their trunks have developed necrotic ring spots, while other trees in the orchard that lack fungi appear healthy. What is the most likely conclusion the farmer can make about the virus infecting his apple trees?

  1. The apple trees were infected by horizontal transmission
  2. The fungi carry disease
  3. The fungi attract disease-carrying insects
  4. The apple trees were infected by vertical transmission.

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