The Garden Under Glass

PESTS AND THEIR EXTERMINATION 297 at a dangerous strength, nor will it succumb to syringings of such mild preparations as quassia or soapy water. A preparation known as “ Spidacide ” is found very effective, but the obnoxious smell it leaves behind lingers for weeks, and thus renders its use less frequent than it would other-wise be. Undoubtedly the best way to wage war on red-spider is to syringe frequently and forcibly with clear water. This will break the web which envelops these minute pests, and make their stay there practically impossible. Of course the best way is to syringe so as to prevent its appearance, but this is not always possible. In the case of flowering plants or ripening fruit it is not advisable to syringe and at such a time red-spider makes rapid head-way. Much red-spider may be prevented by keeping that part of the house damp near the hot-water pipes, by syringing the surface of the staging during hot weather, and by treating vines and peaches with a good winterdressing (from Timothy & Sandwith’s, Bracknell) during the time they are dormant. Rust—A name given to various forms of fungoid disease. The two kinds at present under notice are those which attack Chrysanthemums and carnations. The Chrysanthemum rust is not now so prevalent as it was a few years ago, when it disfigured and spoilt so many collections. Brown spots emitting powder are produced under the leaf, and if not checked the disease spreads and the plants become denuded of leaves. This, of course, cannot fail to have an injuriens efifeet on the plant, besides being so disfiguring. The disease shows itself most prominently from Jtily onwards, and again just after the cuttings are rooted. Preventive measures are advised. These take the form of picking off and burning every affeeted leaf as soon as seen, syringing daily with weak soot-watei', and once a fortnight with sulphide of potassium