. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. I io6 THE BOOK OF to the soil. This \Yill minimise considerably the trouble from such a source; while, if it is possible to apply a dressing of lime in winter beneath trees so affected, this would further help the grower to battle with the disease. Other means of reproducing such diseases of parasitic fungi are by the mycelium, or vegetative part of the plant. For this reason where trees are attacked by fungi like Arinillaria mellea^ Trametes pijii, Szc, the practice of isolating such by means of trenches
. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. I io6 THE BOOK OF to the soil. This \Yill minimise considerably the trouble from such a source; while, if it is possible to apply a dressing of lime in winter beneath trees so affected, this would further help the grower to battle with the disease. Other means of reproducing such diseases of parasitic fungi are by the mycelium, or vegetative part of the plant. For this reason where trees are attacked by fungi like Arinillaria mellea^ Trametes pijii, Szc, the practice of isolating such by means of trenches is adopted. Hartig, in his excellent work upon "The Diseases of Trees," says that if this is carefully carried out it is a certain preventive against the spread of the disease. Another most prolific source of reproduction is found in Sclerotia which are produced by certain fungi affecting Potatoes, ^Marrows, Beans, and many bulbous plants. As the name suggests, they consist of /lard structures which are of variable size, colour, and form. Frequently, however, they are roundish or oval (Fig. 719), and black; they are also numerous. It is within the last few years that Sclerotia in connection with several well-known fungoid diseases have been discovered—the Lily Disease for instance. In this Prof. ^Marshall Ward compares them to mice - droppings, and suggests how readily they might be mistaken for '* foreign ; Then there is an extremely troublesome fungus popularly called the Sclerotium disease i^Sclei'otmus Sclerofio?nn?i), which affects a host of plants, the Sclerotia being of large size. Burning those affected is all that can be done. Sclerotia are sometimes found only in dead plants; at others only in living ones. In no case, however, do they resume activity until the host-plant itself is well advanced. Usually they rest in the soil through the winter, the hard, outer coat serving to pro- tect the soft inner contents of felted mvcelium from frost and
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