. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. I094 THE BOOK OF GARDENING. but more especially to Damsons, Plums, Gooseberries, (See. Not only does Red Spider injure its host-plants by continually sucking the juices from the foliage, but the web that it spins prevents the leaves from exercising their proper functions. The spinning apparatus is very well shown in the ventral view of a Red Spider illustrated at Fig. 706. The pest increases rapidly, and in very —a stage in which they are often mistaken for Moth or Butterfly larv^, though they differ from the latter
. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. I094 THE BOOK OF GARDENING. but more especially to Damsons, Plums, Gooseberries, (See. Not only does Red Spider injure its host-plants by continually sucking the juices from the foliage, but the web that it spins prevents the leaves from exercising their proper functions. The spinning apparatus is very well shown in the ventral view of a Red Spider illustrated at Fig. 706. The pest increases rapidly, and in very —a stage in which they are often mistaken for Moth or Butterfly larv^, though they differ from the latter in possessing a larger number of legs. They are chewing insects, and affect a variety of outdoor plants—Turnips, Apples, Pears, Nuts, Currants, Goose- berries, &c. Though their presence is soon betrayed, yet insects like those affecting Gooseberries are difficult to see, so closely do they approximate to the colour of their food-plant. The insects feed sometimes enclosed in a web like Pamphiliiis flavi- ventris^ a common pest of Pears; curled up in the leaves of their food-plant, like Cladius pyri, which infest the Plum and the Pear; or exposed like the Nut Sawfly {Croesus septent7'io7ialis). Then their manner of attack varies. With some species it is usual to commence with the edge of the foliage ; with others it is the epidermis only which is involved. All the common kinds enumerated are best poisoned through their food-plant, while as an additional precaution the soil beneath the trees may be. bad attacks the foliage assumes an unhealthy, yellow, blotched appearance, and falls. Paraffin emulsion is one of the best remedies for outdoor plants, and this should be repeated until all the pests are removed. Fig. 706.—Ventral View of a Red Spider. Indoors on Grape-vines the XL All Vaporising Insecticide should be resorted to. Many gardeners trust to sulphur in the evaporating-troughs or on the hot-water pipes, but this will not get rid of the pests. A dry atmosphere is c
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