A manual of injurious insects : with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit : and with short introduction to entomology / by Eleanor A. Ormerod.

Date:
[1881]
Catalogue details

Licence: Public Domain Mark

Credit: A manual of injurious insects : with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit : and with short introduction to entomology / by Eleanor A. Ormerod. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    Plum Aphi^ I pnmi, Reaumur. “ Aphis 2^runi is exceedingly destructive. Multipli- cation takes place by millions, and the insects close up the pores of the leaves by their tenacious excretions and the mealy exudations from their bodies. By the constant irritation of their rostra [suckers] the leaves roll up, and under this cover from the weather both the winged and apterous forms live overspread by the before- mentioned mealy powder, which probably to them is a protection.”—(G-. B. B.) The wingless female bearing living young is of various tints, from green to slight olive-brown, with three faint green stripes on the abdomen, short olive-brown horns, and brown eyes; the winged female is apple-green; with head, horns, body between the wings, and feet, black. The male is small, dingy ochreous, vuth the head, part of the body immediately behind it, some markings on the back, and the feet, umber-bro-nm; the fore wdngs are large and broad; sometimes the insect is black. It is to be found in November in company with the egg-laying female, which is small, pale greenish yellow, and trans- parent; and usually shows the mature eggs within, which are ready for laying. The variety of the Green-fly of the Hop (known as Aphis humuli, var. malaheh) is also common under the leaves of the Garden Plum in May and June.—(‘ Mon. of Brit. Aphides.’) Prevention and Remedies.—Amongst various washes recommended are tobacco-water, ammoniacal liquor, soap-suds, and soft-soap. Where trees have to be treated on a large scale,