. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. Fis. 6. The Apple-root Plant Louse (Eriosoma fyri). This species is a woolly louse whicbi works under ground and produces upon the roots of the apple tree swellings or excresences (see fig. 6, a) of varying shapes and sizes;, diseased growths which interfere seriously with the free circulation of the sap, an inter- ference which often results in the death of the parts involved, and sometimes when these in- sects are very numerous their united efforts will occasion the death of the tree. In the more
. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. Fis. 6. The Apple-root Plant Louse (Eriosoma fyri). This species is a woolly louse whicbi works under ground and produces upon the roots of the apple tree swellings or excresences (see fig. 6, a) of varying shapes and sizes;, diseased growths which interfere seriously with the free circulation of the sap, an inter- ference which often results in the death of the parts involved, and sometimes when these in- sects are very numerous their united efforts will occasion the death of the tree. In the more northerly parts of the Northern States this pest is very abundant and with us it is rare to receive a lot of young apple trees either from our own nurserymen or from those of the United States without finding some of them thus affected. The mature louse (fig. 6, b) is about the tenth of an inch long including the closed wings of a dull colour with transparent wings and black legs, and with a peculiar downy or frosted look produced by the exudation from its body of a bluish white, cottony matter by which character it can often be readily recognised. When the wings are expanded the insect measures nearly y^ths of an inch, (fig. 6, c). As this species, situated as it is under ground requires di£Serent methods of attack from those which infest the leaves of plants and trees we will refer to them here. The only arti- ficial remedy yet suggested for the destruction of this pest is hot water used plentifully so as to scald the roots, or, at least, the larger ones over their entire area. To accomplish this successfully, it will be necessary to carefully remove the earth from about the surface of the roots so as to lay them bare. No danger need be apprehended from using the water scalding hot as the application has often been made without injury. This remedy is not so applicable to large trees as it is to young trees in the nursery row or those lately planted. As a prepar- atory measu
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