. Manual of tree diseases . Trees. 228 MANUAL OF TREE DISEASES tinguished from one another except by the microscopic chap- acters of the black fruiting-bodies which are just visible to the unaided eye. The mycelium of both fungi causes powdery white, more or less definite spots on the imder sides of the leaves. The life histories and control of powdery mildew fungi are discussed on page 37. Leaf-Bught Caused by Glceosporium sp. This leaf-blight has been observed on Norway maple (Acer platanoides) in Connecticut, New York and Virginia. No studies have been made on the disease and but little is
. Manual of tree diseases . Trees. 228 MANUAL OF TREE DISEASES tinguished from one another except by the microscopic chap- acters of the black fruiting-bodies which are just visible to the unaided eye. The mycelium of both fungi causes powdery white, more or less definite spots on the imder sides of the leaves. The life histories and control of powdery mildew fungi are discussed on page 37. Leaf-Bught Caused by Glceosporium sp. This leaf-blight has been observed on Norway maple (Acer platanoides) in Connecticut, New York and Virginia. No studies have been made on the disease and but little is known. Fig. 39. — Leaf-blight of maple caused by Glceosporium sp. concerning it. The leaves show yellowish and brown dead areas along the main veins (Fig. 39). Later the leaves wilt and fall from the tree. Minute brown spots form along the veins. These are the fruiting-bodies (acervuli) of the causal. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rankin, W. Howard (William Howard), b. 1888. New York : The Macmillan Company
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