CDFA Pest Prevention Plant Regulation Practice Exam

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Prepare for the CDFA Pest Prevention Plant Regulation Exam. Use study guides and interactive quizzes, complete with explanations and hints, to ensure you're ready to succeed.

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Phloem necrosis of elm is considered a:

A. virus
B. bacteria
C. fungus
D. parasite

The correct answer is: A. virus

Phloem necrosis of elm is classified as a virus because it is associated with a specific disease caused by a viral agent that affects the phloem tissue of the tree. In this context, the virus disrupts the normal function of the phloem, which is responsible for the transportation of nutrients throughout the plant. This disruption leads to the symptoms of phloem necrosis, including wilting, yellowing, and ultimately the decline of the tree's health. Understanding that phloem necrosis is viral helps in recognizing the importance of identifying and managing such diseases, as they often require specific control measures. Viruses are particularly challenging because they can spread through vectors such as insects, making monitoring and management critical for prevention and treatment.