Leaf Phloem Root Plant Species American elm Ulmus americana Xylem Field Notes Physical Symptoms Wilting followed by yellowing

Question

Leaf Phloem Root Plant Species American elm Ulmus americana Xylem Field Notes Physical Symptoms Wilting followed by yellowing browning of leaves in early summer Premature shedding of leaves before autumn Rotale 2 In the diagnosis of Case 2 which mechanism is directly impacted in the tissues or structure Select the correct option and then select the Submit button Progressive death of entire branches ultimately death of roots and of entire plant typically over several years Soil pH normal for the region Soil nutrients normal for the region Laboratory Metabolic Analysis Dark streaks in sapwood area between vascular cambium and the remains of primary tissue observable when branches are sectioned Reduced photosynthetic rate Very low water levels in canopy of tree

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