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Excerpt from The Leaf-Spot Disease of Tomato If the lower surface is the point of entry the spots are large and may involve one-half or the whole of a leaflet. If the upper surface is the point of entry the spots may be no larger than the head of a pin. Usually the upper leaves Show this latter type of infection, evidently from dust as a source. The lower leaves are infected from beneath, doubtless by splashings from the ground or from the older leaves. The fungus lives over winter on the trash from a preced ing tomato crop. It lives over in the greenhouses or cold frame in the trash from seedlings left in the soil. The spores have not been found on tomato seed. Hundreds of plants from all the common varieties have been grown in clean soil without one case of leaf-spot appearing spontaneously. The spores of the fungus are released from the spore case only when the leaf is wet. Heavy dews give conditions which allow an oozing of spores. By far the greatest factor in spreading the fungus is a washing, splashing rain. There fore, the disease is most serious in a rainy season such as that of 1915. Many growers make the mistake in thinking that the tomato disease is caused by the weather, while the truth is that the disease is caused by'a parasite whose spread is favored by the wet conditions. 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.
"Botanically speaking, tomato is a fruit. But by common understanding it is often considered a vegetable as well. Regardless of which term you use, tomato is the most "Googled" fruit and one of the most commonly grown. Unfortunately, tomato plants are also a common target for many diseases and pests, affecting production for anyone growing the crop, including commercial producers trying to maximize yield and the small scale gardener who wants flawless and flavorful garden fresh tomatoes for salads, cooking, and canning. Enter Compendium of Tomato Diseases and Pests, Second Edition. The nearly 250 images and associated information in this highly useful and significantly upgraded book allows anyone-from the gardener to professional-to identify, understand, diagnose, and treat more than 60 diseases of tomato occurring throughout the world. This impressive new handbook, written by expert plant pathologists working with this crop, includes nearly 20 new diseases and disorders, including those caused by fungi and oomycetes, bacteria, phytoplasmas, viruses and viroids."--Publisher's description.
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This volume focuses on integrated pest and disease management (IPM/IDM) and biocontrol of some key diseases of perennial and annual crops. It continues a series originated during a visit of prof. K. G. Mukerji to the CNR Plant Protection Institute in Bari (Italy), in November 2005. Both editors aim at a series of five volumes embracing, in a multi-disciplinary approach, advances and achievements in the practice of crop protection, for a wide range of plant parasites and pathogens. Two volumes of the series were already produced, dedicated to general concepts in IPM and to management and biocontrol of nematodes of grain crops and vegetables. This Volume deals, in particular, with diseases due to bacteria, phytoplasma and fungi. Every day, in any agroecosystem, farmers face problems related to plant diseases. Since the beginning of agriculture, indeed, and probably for a long time in the future, farmers will continue to do so. Every year, plant diseases cause severe losses in the global production of food and other agricultural commodities, worldwide. Plant diseases are not limited to episodic events occurring in single farms or crops, and should not be regarded as single independent cases, affecting only farms on a local scale. The impact of plant disease epidemics on food shortage ignited, in the last two centuries, deep cultural, social and demographic changes, affecting million human beings, through i. e. migration, death and hunger.