A crown gall is described as being caused by which type of organism?

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Prepare for the Michigan Certified Pesticide Category 6J Test with interactive quizzes, flashcards, and detailed explanations. Ensure your readiness with comprehensive practice questions.

Multiple Choice

A crown gall is described as being caused by which type of organism?

Explanation:
Crown gall is caused by a bacterium. This disease results from infection by Agrobacterium tumefaciens, a soil-dwelling bacterium that enters plant tissue through wounds and transfers a piece of its Ti (tumor-inducing) plasmid into plant cells. That DNA reprograms the plant cells to divide uncontrollably, producing tumor-like galls on stems and roots. This bacterial origin is why the disease is not due to a virus, fungus, or nematode. Management focuses on using disease-free stock, sanitizing tools to prevent spread, selecting resistant varieties when available, and employing biological controls that target this bacterium.

Crown gall is caused by a bacterium. This disease results from infection by Agrobacterium tumefaciens, a soil-dwelling bacterium that enters plant tissue through wounds and transfers a piece of its Ti (tumor-inducing) plasmid into plant cells. That DNA reprograms the plant cells to divide uncontrollably, producing tumor-like galls on stems and roots. This bacterial origin is why the disease is not due to a virus, fungus, or nematode. Management focuses on using disease-free stock, sanitizing tools to prevent spread, selecting resistant varieties when available, and employing biological controls that target this bacterium.

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