Fungus Diseases of Coffee in Porto Rico (Classic Reprint) - Softcover

G. L. Fawcett

Softcover

ISBN 10: 1334411441 ISBN 13: 9781334411441

Publisher: Forgotten Books, 2024

Synopsis

Excerpt from Fungus Diseases of Coffee in Porto Rico

On examination, the threads of the fungus which cause the disease will be found on the lower side of the twigs where at each pair of leaves it branches to form a thin web covering their undersurfaces. On the newly attacked leaves this web is white, but later it becomes brown. The leaves on which the fungus has obtained a better foot hold and which have turned black often have a finely mottled ap pearance, due to the thickening of the web at the points where it is attached to the leaf. A further stage is represented by the develop ment of the web into a parchment-like membrane completely con cealing the lower side of the leaf. This may be removed with a needle or knife point like a piece of gold beater's skin. The webs correspond to the feeding form of the fungus, serving to absorb food material from the leaves; the threads to the traveling form, by the extension of which along the stems and branches in the course of growth it reaches fresh material on which to feed. The threads which are at first white become brown after a time, break and fall away, but fragments often remain, sometimes concealed by the bark, which serve as new sources of infection. Vlhen examined micro scopically the dense places are seen to be made up of flattened, much branched threads, which besides acting as holdfasts may also serve to draw food material from the leaf, although the threads which penetrate the leaf soon after it is attacked are probably more impor tant in food absorption. No spores or reproductive bodies have been found in the Porto Rican fungus. The vegetative hyphae of the webs are much branched and interlaced, the branching being often at right angles. (pl. VII, C.)

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About this edition

• Publisher: Forgotten Books
• Publication date: 2024
• ISBN 10: 1334411441
• ISBN 13: 9781334411441
• Binding: Paperback
• Language: English
• Number of pages: 43