Insects injurious to fruits . specimens, one of which is .seen in the figure, are also black ;these fly from one tree to another and esttd)lish new —Syringe the trees with strong soap-suds or otheralkaline washes, or with strong tobacco-water. A numberof lady-birds and their larvce, also the larvae of Syrphus flies,feed on these lice. Many of them are destroyed by a minuteChalcid fly, which lives within their bodies. This friendlyspecies, Stenomesius aphidicola Ash mead, is shown, muclimagnified, in Fig. 399, where a represents the female, and bthe male. The short lines at th
Insects injurious to fruits . specimens, one of which is .seen in the figure, are also black ;these fly from one tree to another and esttd)lish new —Syringe the trees with strong soap-suds or otheralkaline washes, or with strong tobacco-water. A numberof lady-birds and their larvce, also the larvae of Syrphus flies,feed on these lice. Many of them are destroyed by a minuteChalcid fly, which lives within their bodies. This friendlyspecies, Stenomesius aphidicola Ash mead, is shown, muclimagnified, in Fig. 399, where a represents the female, and bthe male. The short lines at the sides indicate their naturalsize. They are so minute that as many as three of the perfectwinged flies have been known to issue from the body of asingle aphis. INSECTS INJURIOUS TO THE ORANGE. 389 A tiny Ichneumon fly, the red-legged Trioxys, Trioxystestacelpes Cresson, also infests this species of aphis, Avhile athird friendly parasite is a small Aphidius, a shining, black Fig. fly. Were it not for these predaceous and parasitic insects,the Aphides would soon multiply to such an extent as to ruinthe plantations. No. 249.—The Rust oleivorus Ashmead. The rust which often occurs on the fruit of the orangewas until of late regarded as due to a fungoid growth, butrecent investigators have shown that it is caused by a verysmall, four-legged mite, which punctures the oil-cells, and theexuding oil, when exposed to the influence of the atmosphere,soon undergoes a change, assuming a dark, rusty appearance,which seriously depreciates the value of the fruit for the unaided eye the oranges appear dusty, but if examinedwith a magnifying-glass they will be seen covered with amultitude of mites of a whitish-flesh color. A weak alkaline wash applied to the fruit would doubtlessdestroy these mites. Another rust, known as the black smut, often spreads ;J90 INSECTS INJURIOUS TO THE OR A NO E. over both leaves aiul fruit, making tliem appear very unsig
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