. The Book of gardening; a handbook of horticulture. Gardening; Horticulture. no4 THE BOOK OF GARDENING. Such perithecia disclose their contents, and the spores are released to be distributed by insects, birds, wind, or even by- man himself, those finding a suitable " home" germinating, increasing the area of the disease. And similarly with other parasitic fungi which attack leaves, &c. The gardener's chief difficulty with all is that his first acquaintance with any is usually when much mischief has been done. His first indications are when the fungus has existed sufficiently lon
. The Book of gardening; a handbook of horticulture. Gardening; Horticulture. no4 THE BOOK OF GARDENING. Such perithecia disclose their contents, and the spores are released to be distributed by insects, birds, wind, or even by- man himself, those finding a suitable " home" germinating, increasing the area of the disease. And similarly with other parasitic fungi which attack leaves, &c. The gardener's chief difficulty with all is that his first acquaintance with any is usually when much mischief has been done. His first indications are when the fungus has existed sufficiently long to produce out- ward characteristics—like the familiar Mildew on the Straw- berry, the "Rust" on Chrysanthemum, or the Mushrooms in the roots of his orchard and landscape trees like Agaricus (Armillaria mellea). Again, he does not seem able to. Fig. 718.—Portion of Cankered Tree, due to Nectria ditissima. (By permission of the Board of Agriculture.) reconcile the fact that such fungi have forms of fruits, or spores, varying with the seasons ; each has its part to play in the reproduction, or it may be in the extension of the infected area, of the species. Then just as there are in the Animal World certain parasites—like, say, the hydatid which causes gid in sheep, and which needs another host, the dog, to complete the cycle, so there are certain small fungi (called hetercecious) which require two plants—sometimes of widely different natural orders—to complete the cycle. The Gooseberry Rust (sEadium grossularid), whose orange-red patches are familiar upon the foliage and fruit of that plant, is but the Cluster-Cup stage of Pucrinia Pringsheimiana, whose other stages are found upon Carex acuta and Carex Goodenovi ; while the Rust, found on the leaves and other parts of Barberries, is likewise a stage in the life-history of a still more destructive fungus known as Wheat Rust {Pucrinia graminis). These are only two familiar examples- of heteroecious fungi. Man
Size: 2386px × 1047px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjec, booksubjectgardening
