Tree wounds and diseases, their prevention and treatment, with a special chapter on fruit trees by Webster Angus Duncan

Author:Webster, Angus Duncan
Language: eng
Format: epub, pdf
Tags: Trees -- Diseases and pests
Publisher: Philadelphia Lippincott

106 TREE WOUNDS AND DISEASES

and are inky black, which is well set off by the margin of dirty yellow.

The attacked portion of the leaf becomes wrinkled and much thickened in texture, while all the affected foliage drops off prematurely. After lying on the ground during the winter, the thread-like spores are emitted in vast quantities at the time when the foliage of the sycamore is appearing in May and June. It is, however, not only the sycamore that is attacked by this fungus, for the Norway maple and our native field maple (Acer cam-pestre) are equally liable to injury, and have in some instances suffered very severely.

Altogether this fungus is a formidable pest, that is becoming yearly more plentiful and disfiguring the maple and sycamore leaves to a wide extent. Another fungus which infests the leaves of these trees is Rhytisma punctata^ which may at once be distinguished from the former species by the many small black spots studded thickly together, which combine to form the large conspicuous blotches for which affected trees are remarkable. Both species are sometimes found on the same leaf. As

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