File:The Gardeners' chronicle - a weekly illustrated journal of horticulture and allied subjects (1913) (14753406056).jpg

Identifier: gardenerschronic354lond (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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ss. From these discussionsand from correspondence which we havecarried on, it is evident that Englishgardeners are very much alert to the diffi-culties which beset the growing of SweetPeas. The American growers are be-ginning to realise that the failure inSweet Pea culture cannot be attributedalways to the ravages of the green aphisor to overfeeding, but that there are alsodefinite disease factors to be taken intoaccount. These are in the form of fungousand bacterial parasites which are capableof producing various diseases. We shalltherefore enter at once into a discussionof some of these diseases. The Mosaic Disease. This disease is readily recognised bythe yellow dotting or mottling of the leaves,hence the name mosaic (see figs. 8 and 9).In varieties with thick leaves this mottlingis associated with curling; a cessation ofgrowth results, but later the plant mayovercome the disease. In varieties withdelicate and thin leaves the yellow mottling■soon reaches a state where much of the
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Fig. 8.—the mosaic disease. dwarfing of plant and rolling of leaves, chabactbristic symptoms. common. The mosaic disease affectsthe seedlings at an early stage, andfor some time keeps pace with the growth borne on comparatively long ones, theyhave their petals curled and distorted, andthe natural colour of the blossom is faded.All varieties, with the exception per-haps of the Cupid or dwarf varieties, aresubject to the disease; but some sortsare much more severely affected thanothers. It is not uncommon to see in-fected plants so badly diseased as to beunable to make any further growth. In themajority of cases under our observation,however, infected plants outgrow thedisease entirely, showing a distinct line ofdemarcation between the early affectedparts and the healthy, new growth madeat a later period. Other leguminousplants which suffer from a similar mosaicdisease are the Red Clover (Trifoliumpratense L.), and several forage species ofLathyrus. The mosaic disease of the Sweet Pea

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