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Excerpt from Report on the Condition of Olive Culture in California: May 1900 Olive Knot - The only other disease that would seem to be of any real danger to the tree is the olive knot. This appears as woody tumors on the leaves, branches, and stems (particularly on the small stems) of the Olive tree Of all ages. It is confined to the warmer localities, and especially to hot, over-moist soils. The Size Of the tumors on the leaves varies from that of a pinhead to that of a pea. This disease is caused by a certain species Of bacterium which com menees to grow just under the bark and leaves in the interior of the tumor it produces. It is carried from tree to tree by pruning instru ments, also probably by insects. It will only attack trees which are 'vigorous and full of sap. The varieties which are most valuable for their fruit (that is, those removed from the wild type) are the most subject to attack. This disease has been found in California, but in such isolated localities that it is not to be greatly feared at present. How ever, great care should be exercised in the introduction of nursery stock from infected districts. The writer believes that the prompt action Of the County Horticultural Commissioners and Olive-growers in the infected districts has successfully eradicated this disease from the State. This, however, cannot be stated positively at present. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.

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