Image d'archive à partir de la page 147 de Cyclopedia of American horticulture . Cyclopedia of American horticulture : comprenant des suggestions pour la culture de plantes horticoles, les descriptions des espèces de fruits, légumes, fleurs et plantes ornementales vendues aux États-Unis et au Canada, ainsi que des notes biographiques et géographiques cyclopediaofame03bail Année : 1906 s'avérer instructif de la botaniste et s'offrir le plaisir infini et passe-temps pour l'amateur. Z)j.Â"facilite.-Les orchidées sont soumis à beaucoup de maladies. Ceux qui ont l'importance d'un point de vue culturel et plus gênant pour le
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Archive image from page 147 of Cyclopedia of American horticulture . Cyclopedia of American horticulture : comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches cyclopediaofame03bail Year: 1906 prove instructive to the botanist and afford infinite pleasure and pastime for the amateur. Z)i.«eases.-Orchids are subject to many diseases. Those having importance from a cultural standpoint and most troublesome to the grower are known as wet- and dry-rot and spot. Wet-rot is caused by an overmoist or stagnant atmosphere, and is usually first detected by a serai-transparent appearance of the parts afPected, which soon become dark brown. It spreads slowly along the tissue. If noticed at the commencement it can be readily checked by slitting the epidermis with a sharp knife and removing the plant to a more airy position in the house for a few days. Dry-rot is caused by a fun- gus which attacks the rhizome of the plant. It is often produced through burying the rhizome or base of the plant with compost. Cypripediums are subject to it. Large, healthy growths when attacked quickly show a sickly pale color in the foliage, which, on examination of the base, will be found discolored, and with a light brown appearance. If the portion attacked is quickly removed with a sharp knife it will usually give no fur- ther trouble; otherwise it will travel through the en- tire rhizome and destroy the plant in a very short time. Spot comes from various causes: the appearance of small dark brown spots on the succulent leaves and pseudobulbs is usually an indication of cold and over- watering. Spot also arises through weak tissue, espe- cially in Phalsenopsis, Saccolabiums and Angrsecums during winter, which have been grown too warm, shady and moist. Tlie affected parts should be slit with a sharp knife and a
