Certified Arborist Practice Test

Question: 1 / 400

Which of the following diseases is not a vascular disease?

Verticillium Wilt

Oak Wilt

Leaf Spot

Leaf spot is classified as a foliar disease, primarily affecting the leaves and foliage of plants rather than the vascular tissues. This condition is typically caused by various fungi or bacteria that lead to the development of dark, discolored spots on the leaves, affecting their photosynthetic capability and overall health.

In contrast, vascular diseases like Verticillium Wilt, Oak Wilt, and Laurel Wilt directly impact the plant's vascular system, which is responsible for the transportation of water and nutrients. These diseases often cause symptoms such as wilting, yellowing, or stunted growth as they disrupt the flow within the plant's xylem or phloem. Hence, understanding the distinction between foliar and vascular diseases is crucial for proper diagnosis and treatment of plant ailments.

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Laurel Wilt

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