. Carnegie Institution of Washington publication. 9o BACTERIA IN RELATION TO PLANT DISEASES. ECONOMIC ASPECTS. The economic aspects may be considered under four heads: (i) Losses; (2) Natural methods of infection ; (3) Conditions favoring the spread of the disease; (4) Methods of prevention. In the United States Department of Agriculture and in our State Experiment Stations, naturally, much stress is laid on economic considerations, especially on A. 2, 3, and 4. A knowledge of 2 and 3 will frequently lead to some simple and effective means of prevention. B. Fig. 74 * LOSSES. It is desirable th
. Carnegie Institution of Washington publication. 9o BACTERIA IN RELATION TO PLANT DISEASES. ECONOMIC ASPECTS. The economic aspects may be considered under four heads: (i) Losses; (2) Natural methods of infection ; (3) Conditions favoring the spread of the disease; (4) Methods of prevention. In the United States Department of Agriculture and in our State Experiment Stations, naturally, much stress is laid on economic considerations, especially on A. 2, 3, and 4. A knowledge of 2 and 3 will frequently lead to some simple and effective means of prevention. B. Fig. 74 * LOSSES. It is desirable that there should be made from time to time a careful estimate of the losses caused by each particular disease, not only as a warning to farmers, fruit-growers, market-gardeners, and florists of the exist- ence of these dangers, but also as an aid to legislatures and governments in deciding how much money may be judiciously appropriated for the scientific investiga- tion of these problems. Pathologists are urged to make and publish such records. It is perhaps unnecessary to add that the determinations should be reasonably accurate, otherwise it were much better not to make any records. Occasionally, when diseases are wide- spread and destructive, so that depreciation of land values and the hostility of a community might result from great publicity, the pathologist may have to con- sider discretion the better part of valor and refrain from publishing, but in this event he should not fail to make full records which may subsequently be pub- lished or at least consulted. What we need and must finally have is a large body of accurate statistics, covering a series of years, many localities, and many diseases. To make these statistics most useful, certain meteorological data should be collected in the same localities. To be of most service this data concerning the weather should be recorded by the pathologist him- self, who will be better able than anyone else to note down just those th
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