. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. 29A. Fig. 29B. lias its own Aphis to suck its juices and to impair its vitality. It would, therefore, be an endless task to attempt to enumerate all the different kinds of Aphis that are to be met with and fought against; the same remedies, however, will apply with almost equal efficacy in all cases, allowance being made for the difference of application requisite in treating, for instance, an apple tree and a wheat plant, a hop vine and a window flower. The illustration (Fig. 29A) given herewith represents a highly
. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. 29A. Fig. 29B. lias its own Aphis to suck its juices and to impair its vitality. It would, therefore, be an endless task to attempt to enumerate all the different kinds of Aphis that are to be met with and fought against; the same remedies, however, will apply with almost equal efficacy in all cases, allowance being made for the difference of application requisite in treating, for instance, an apple tree and a wheat plant, a hop vine and a window flower. The illustration (Fig. 29A) given herewith represents a highly magnified winged male and wingless female of the plant-louse attacking the apple (Aphis mali, Fabr.) ; the species infesting other plants are very similar, varying chiefly in colour from pale green to deep black. Fig. 29B represents the winged form of the woolly Plant-Louse of the apple, a group of the larvae, and a twig perforated by the insect. The ordinary remedies for this pest are (1) watering the infested plants with strong soap-suds, or a decoction of coarse tobacco : (2) dusting with lime or sulphur ; (3) exposing them to the fumes of strong tobacco. The first remedy is applicable to most cases, and the third only to plants in pots, or those sufficiently small to be covered over while undergoing fumigation. Many experiments have recently been made both in England and the United States, for the purpose of finding out a cheap and thoroughly effective remedy against this and other insect pests. Coal oil (or kerosene) is so cheap, so universally an article of domestic consumption, and so deadly to all insect life, that experiments have been especially directed towards its employment as an insecticide. The great difficulties to be overcome are its destructiveness to vegetation, when applied undiluted, and the almost impossibility of diluting it, beyond a mere mixing of a momentary character with water or other liquid. These difficulties have, however, been at last solved by
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
