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The journal of the Ministry of Agriculture. (1920) (14755869616)

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The journal of the Ministry of Agriculture. (1920) (14755869616)

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Identifier: journalofministr2731grea (find matches)
Title: The journal of the Ministry of Agriculture.
Year: 1919 (1910s)
Authors: Great Britain. Ministry of Agriculture
Subjects: Agriculture Agriculture
Publisher: London : Ministry of Agriculture and Fisheries
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: BHL-SIL-FEDLINK



Text Appearing Before Image:
re. The symptoms manifested, suchas stunting of the growth, curling of the leaves and poornessof crop, clearly indicate that the functions of the plant are notproceeding normally. One important fact has been determined,namely, that much of the food manufactured by the leaves ofdiseased plants does not pass down to the new tubers as itnormally should, but remains in the leaf in the form of starch.Other s^/mptoms of abnormal physiology have been discovered.But whatever the primary cause of these disturbances, the eftectis sufficiently great to influence the seed-tubers profoundly,since tubers produced by affected plants give rise to diseasedplants the following year. The disease, therefore, may, in asomewhat loose sense, be said to be inherited. In this country the most commonly accepted explanation ofthe origin or cause of leaf-curl is that it is due to the use ofover-mature seed. Such a condition in the tubers might ariseas the result of cultivation in dry soils, particularly in those
Text Appearing After Image:
Fig. I.—Potato Leaf-curl. A mild attack showing curling confined to thilower leaves ; this is accompanied, however by a decided reduction in crop.Tubers from such plants should not be used for seed purposes, as they willgive rise to plants showing the disease in a much more severe form, andwith a very poor yield.

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1920
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American Museum of Natural History Library
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the journal of the ministry of agriculture 1920
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