Observations on the Mosaic Disease of Tobacco (Classic Reprint)

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Excerpt from Observations on the Mosaic Disease of TobaccoThis very singular disease of the tobacco leaf consists, in general appearance, in a more or less sharply defined differentiation into light and dark green areas, making the leaves have a more or less mosaic appearance. In the less pronounced cases the variation in the color is Slight, but sufficiently marked to be at once apparent. In such cases there is very little distortion of the leaves. The light-green areas are, as a rule, between the larger vascular bundles. (pls. I and VI.) The darker green portions form more or less of a. Border along the larger bundles. Occasionally, however, the dark and light green patches are not distributed with special reference to the vascular bundles, but occur indiscriminately. Where the contrast is more marked the light-colored, or sometimes even yellowish, areas grow slowly, while the dark-green areas grow more rapidly, and thus the leaf becomes badly distorted. (pis. III and IV.) In some cases the whole plant becomes so deformed as to be almost unrecognizable. Even where the leaves are only slightly diseased and not deformed they are less elastic than the healthy leaves, and are not so suitable for wrappers for cigars, and have a poorer burn and aroma. The diseased plants do not grow as vigorously as healthy ones, but they usually produce ¿owers and fruit, and the seed, even from badly diseased plants, may produce healthy plants. There is no conclusive evidence that the plants from seeds of diseased plants are more subject to the disease than are those from the seeds of healthy plants.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.