FORESTRY
PLANT AND WOOD ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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dead areas on leaves usually along leaf margins and veins
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localized areas of dead bark and underlying wood on twigs, branches, and trunks
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root tips that are brown and dead
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a dry, powdery, reddish-orange substance on leaves
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Detailed explanation-1: -Anthracnose is the most serious disease of sycamore. The first symptoms appear in early spring as the leaves begin to unfurl from the leaf buds, and at this stage the disease may be mistaken for frost damage. Infected leaves that do not drop will develop light brown dead areas, usually along the veins.
Detailed explanation-2: -Anthracnose symptoms vary by plant host and due to weather conditions. On landscape trees, the fungi infect developing shoots and expanding leaves. Small beige, brown, black, or black spots later appear on infected twigs of hosts such as elm, oak, and sycamore.
Detailed explanation-3: -Black spots begin to develop on the surface of the plant, and grows radially outward: the manifestation of anthracnose disease. These are the first visual symptoms of an infected plant, and usually occur along leaf veins on the underside of the leaf.