. Annual report. Entomological Society of Ontario; Insect pests; Insects. 82 ENTOMOLOGICAL SOCIETY OF ONTARIO. hatched mite-like larvae to the full-grown insects. In 6evere cases of infestation this massing of the scales produces a scurfy appearance of the bark, which when once seen is easily recognized. On young twigs and fruit and leaves, there is usually a well denned purplish ring surrounding each scale, and although this purpling effect is pro- duced by a few other scales, such as the Putnam scale (A. ancylus, Put.), it is particul- arly characteristic of the San Jose' scale, and even upo
. Annual report. Entomological Society of Ontario; Insect pests; Insects. 82 ENTOMOLOGICAL SOCIETY OF ONTARIO. hatched mite-like larvae to the full-grown insects. In 6evere cases of infestation this massing of the scales produces a scurfy appearance of the bark, which when once seen is easily recognized. On young twigs and fruit and leaves, there is usually a well denned purplish ring surrounding each scale, and although this purpling effect is pro- duced by a few other scales, such as the Putnam scale (A. ancylus, Put.), it is particul- arly characteristic of the San Jose' scale, and even upon large branches, although invisible at the surface, may be found by cutting away some of the bark. The scales of the males and females differ somewhat in shape. Female:—Scale very thin, almost circular in outline, much flattened; size ranging from one-twentieth to one-eighth of an inch in diameter white at first, becoming grayish or black- ish, and later much blackened by the fungus lumago saliciyia, so common on trees attacked by many kinds of bark-lice and plant lice. In the centre of the is a small dark or yellowish nipple-like elevation surrounded by a distinct circular darkened depression, which, as pointed out by Prof. Webster, is one of the best distinguishing marks between this scale and some closely allied species. Male :—Scale about half the size of that of the female, rounded-oblong, with the nipple-like elevation nearer one end than the middle. Life History.—The winter is passed by the partially grown insects beneath their scales. "With the return of warm weather next spring growth is resumed, and the males reach maturity a few days before the females. They are extremely small two-winged flies, and when examined under a magnifying glass are found to have orange-yellow bodies, iridescent dusky wings and black eyes. The minute creatures have no mouths,. Fig. 55. Female scale much enlarged. so can take no food ; consequently, having fertilized the fe
Size: 1446px × 1728px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
