File:The Gardeners' chronicle - a weekly illustrated journal of horticulture and allied subjects (1913) (14579896677).jpg

Identifier: gardenerschronic353lond (find matches)
Title: The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects
Year: 1874 (1870s)
Authors:
Subjects: Ornamental horticulture Horticulture Plants, Ornamental Gardening
Publisher: London : (Gardeners Chronicle)
Contributing Library: UMass Amherst Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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hem. All three forms are alike in this, thattowards the end of their period of activity theyproduce resting or winter spores, which lodge inthe cracks of the bark or remain in the soilduring the winter, resuming their activity againin spring or early summer. The red form, the well-known orange fungusor red rust, is perhaps the least injurious of thethree. It seems to attack by preference theHybrid Perpetuals and Briars, the Hybrid Teasand Teas suffering much less. It is usually firstseen attacking a leaf-bud on the stem, and pro- ducing a large quantity of its red powderyspores; these should be watched for and at onceremoved either by cutting out the bud, or clean-ing off the fungus with a Tag soaked in methy-lated spirits or solution of copper sulphate. and black spot, which appears a little later,generally just as there comes an apparent checkto the growth. Black spot is far the most fatalof these diseases. A bed of Roses badly attackedis nearly ruined for a time, all the leaves may
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Fig. 137.—fasciated oxlip. Fromsketch by Mr. Worthington\Smith. The white form is ordinary mildew. The win-ter spores, though no doubt scattered over theground, are often formed on the stems, and if atpruning time any stem with mildew on it is notremoved, the mildew should be carefully cleanedoff with a rag and spirit or copper solution. The black form perhaps includes two fungi :rose-leaf scorch, which comes in earlv summer, fall and the plants are seriously weakened.Mildew can and should be kept in check, thoughit cannot be banished, by careful syringing, butno spray that I have yet tried seems to have any-material effect in checking black spot which hasonce seriously infected the plants. To preventthe occurrence of the disease every means thatoffers a chance of success should be tried. The 324 THE GARDENERS CHRONICLE. (May 17, 1913. leaves that first show signs of infection shouldbe removed and burnt, but interference at thisstage is really too late. I have picked off basket-1uls

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