. The Book of gardening; a handbook of horticulture. Gardening; Horticulture. ON PESTS GENERALLY. II09 extremely common. According to the Cornell Agricultural Bulletins, the time to spray is before the blossoms open, and again when they have fallen. This should suffice in dry seasons; but in wet ones it may be necessary to spray three or four times more at intervals of about ten days. Armillaria mellea (Agaricus melleus).—This is a most destructive fungus found upon living ornamental trees, such as Conifers, as well as upon orchard trees. It is responsible for the disease known as Tree Root Ro
. The Book of gardening; a handbook of horticulture. Gardening; Horticulture. ON PESTS GENERALLY. II09 extremely common. According to the Cornell Agricultural Bulletins, the time to spray is before the blossoms open, and again when they have fallen. This should suffice in dry seasons; but in wet ones it may be necessary to spray three or four times more at intervals of about ten days. Armillaria mellea (Agaricus melleus).—This is a most destructive fungus found upon living ornamental trees, such as Conifers, as well as upon orchard trees. It is responsible for the disease known as Tree Root Rot. The fungus (Fig. 720) is most abundant, and is found both as a saprophyte and as a parasite. The clusters of Mush- rooms at the base of trees are very familiar; they are, moreover, con- spicuous alike as to size and colouring. The cap is of a pale yellow, with darkish scales upon it; the stem is also yellow. The fungus finds access to healthy trees either by means of its spores, which germinate on an in- jured part of the bark; or by means of the very peculiar mycelium, which is black and stringlike, and always endeavouring to penetrate the roots of healthy trees. The only thing that can be said in favour of this fungus is that its sporophores, or Mushrooms, are edible, though not particularly rich in flavour, being somewhat strong. Care should be taken to carefully remove and either eat or burn all specimens of the fungus, so that the danger of trees being infested by the spores which are shed is minimised. The mycelium found under the bark is white and felted. Once a tree has been badly attacked nothing can save it from destruction, as the mycelium spreads under the bark with considerable rapidity. Preventive rather than remedial measures should be adopted. These may well consist in the removal of all dead stumps (Fig. 720) on which the fungus is growing as a saprophyte; and in isolating the infected live trees by means. Fig. 720.—Mass of Armillarta mellea Root of Youn
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