Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . INSECTS AFFECTING FLOWERS IN THE WIN-DOW-GARDEN AND GREEN-HOUSE. INJURING THE LEAVES. Plant-lice or Aphides. There are many different species of aphides, plant-lice, or green flies, affecting the various floweringplants. But all are quite similar in life-history andhabits, and the same remedies apply to each. Theyall multiply with marvellous rapidity on account of their habit of giv-ing birth to livingyoung without thepresence of maleaphides. Theymature rapidly,-and obtain foodb
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . INSECTS AFFECTING FLOWERS IN THE WIN-DOW-GARDEN AND GREEN-HOUSE. INJURING THE LEAVES. Plant-lice or Aphides. There are many different species of aphides, plant-lice, or green flies, affecting the various floweringplants. But all are quite similar in life-history andhabits, and the same remedies apply to each. Theyall multiply with marvellous rapidity on account of their habit of giv-ing birth to livingyoung without thepresence of maleaphides. Theymature rapidly,-and obtain foodby inserting theirpointed beaks into^the stem or leaf,,and sucking out the sap. There are generally twoforms of them, one being winged (Fig. 83, b, c) andthe other wingless (a). ? These insects are the com-monest pests of flowering plants. Remedies.—Tobacco is the great specific for these-insects. It may be used in various forms, but gener-ally the most satisfactory form is that of the refuse-. ...,*r- • &>Fig. 83. Aphis : a, wingless form, magnified ;6, winged form, magnified; c, same,natural size. INJURING THE 159^ powder of the cigar factories. This should be usedfreely as a mulch for low-growing plants, such as thedaisy; and if blown upon infested plants, having firstsprayed them with water, by means of a powder-bellows or Leggetts powder-gun, it will clear themreadily. In green-houses tobacco steins are com-monly used to smoke the plants. A few live coalsare put upon a shovel, or into a metal bucket, andrefuse tobacco stems are laid upon them. The houseis then tightly closed and the smoke allowed to re-main several hours. The greatest objection to thismethod is that tender plants are liable to be seriously-injured by an over-dose of the smoke. The tobaccomay also be used in the form of a decoction, madeby pouring hot water on the stems, allowing it tocool, and then drawing off the liquid. This may besprayed upon the plants, or, where not too large, the
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Keywords: ., bookcentury1800, bookdecade1890, bookidi, booksubjectinsecticides
