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Abstract

On potato stems, leaves, and tubers.
Many theories have been advanced with regard to the origin
of the destructive Peronospora infestans or potato disease.
Meteorological and electrical states of the atmosphere,
saturation of the plant by water, degeneration by various
methods of cultivation, the ravages of insect life, these and
others have each in their time been brought forward as the
cause of all the mischief with our potato crops.
also liberalJy supplied n1e with siides for co1nparison.
When the potato plant has been attacked by the disease,
the leaves assume a pale tint, and discolored spots appear
thereon; if, in this stage of the disease, the underside of the
leaf is examined it will be found to be covered with whitish
patches, these patches are stems with fruit and arise from the abundant septate and branched 1nyceliu1n, or opalescent threadlike
roots which grow in the midst of the cells of the leaf, and
eventually appear through the stomata as fertile stems.
The eighteen at present known species
of Peronospora attack parsnips, peas, onions, spinach, lettuce,
clover, nettles, anemones, poppies, roses, docks, etc., but
apparently not in such a destructive manner as P. infestans
does with potatoes.

Item Type:	Article
Authors/Creators:	Bastow, Richard Austin
Keywords:	Royal Society of Tasmania, Van Diemens Land, VDL, Hobart Town, natural sciences, proceedings, records
Journal or Publication Title:	Papers and Proceedings of the Royal Society of Tasmania
ISSN:	0080-4703
Collections:	Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:	In 1843 the Horticultural and Botanical Society of Van Diemen's Land was founded and became the Royal Society of Van Diemen's Land for Horticulture, Botany, and the Advancement of Science in 1844. In 1855 its name changed to Royal Society of Tasmania for Horticulture, Botany, and the Advancement of Science. In 1911 the name was shortened to Royal Society of Tasmania.
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