The Practitioner Volume 25

The Practitioner Volume 25

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...grow on any material at hand provided it is not caustic or corrosive. Microscopic fungi are commonly prepared for prolonged examination in glycerine, and nothing is more common than to see the spores of the potato fungus (and the spores belonging to many other fungi) growing in glycerine. The sudden onslaught then of the potato-murrain each successive autumn is caused by the advent of exactly sufficient warmth and humidity to suit the germination of the resting spores. The resting spores or eggs of both the Pcronospom and the Fusisporium rest on and in the ground everywhere, especially in damp places and among decaying vegetable refuse. When these eggs at length burst they generally protrude threads which carry seeds or spores, and these seeds are set free in uncountable millions. These seeds sail through the air, and such as fall upon potato plants rapidly gain an entrance to the interior tissues of the host and cause its corrosion and destruction. N0 doubt living resting spores together with fungus spawn are often planted with potatoes, and when this is the case, the disease commences with the tuber and works upwards, whilst in the former case, 'i.e., when the germination of the resting spores takes place upon the neighbouring ground, the leaves are the first parts attacked from the air, and the disease works downwards to the tuber. Diseased potatoes when planted often produce perfectly sound crops, for it by no means follows as a rule that because a potato is merely discoloured and ' diseased' as potato growers say, that it must invariably carry within itself healthy hybernating spawn or hybernating spores, or seeds of the murrain capable of reproducing the disease. When potatoes once have the murrain decidedly upon them, more

Product details

  • Paperback | 182 pages
  • 189 x 246 x 10mm | 336g
  • United States
  • English
  • black & white illustrations
  • 1236960882
  • 9781236960887