This fungus appears likely to become as destructive to the Rose (if indeed it is not so already) as it is among the vines. A few years ago it was confined to a few plants, or to some one or two varieties, but latterly it has attacked most of our roses during July, August, and September, and materially injured the autumnal bloom. Some kinds are more subject to it than others, and the Hybrid Perpetuals more so than any other class; but latterly, even the Bourbons, Teas, and Chinas, have taken it Flour of sulphur is the best remedy with which I am acquainted. I have used the Gishurst Compound and Pages' Composition, but I was not very successful with either. I always found the sulphur to have the best effect; and this must be applied as soon as the disease makes its appearance, and persevered with afterward, or it will have little effect. It should be dusted on when the foliage is wet; early in the morning, when the plants are moist with dew, is about the best time for the application. If the sulphur gets washed off by rain, or blown away by the wind, it should be looked after, and the sulphur reapplied the next morning.

If the plants are in pots, the most effective way to apply the sulphur is this: take the plant and immerse it in a pail of water till every part is thoroughly wet; then hold it upside down, and dust on the sulphur. The sulphur being put on the under side of the leaves, it will not make any show, and will remain on longer without being washed off, and will be more effective in killing the mildew. Before commencing to dust on the sulphur, lay down two or three newspapers to catch the sulphur that would otherwise be wasted. It can be readily gathered again when dry.

I have used it on Chrysanthemums in the same way, and on grape-vines in pots. It looks much neater when applied in this way than when applied to the upper side of the leaf.