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SCIENCE the crops on which they occur and are subdivided into diseases of major and minor irnportanca This arrangaent is especially serviceable to those who are not s~i a l i s t s on plant diseases. The descriptions of the symptoms are brief, clear and very readable. There is no attempt 'whatever to discuss the organwhich are the causes of &= diseases but references are given to some of the more important publications. Each disease is design a M by its co.Ulmon name; the scientific name for both the and the perfect

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