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Outdoor Roses (Spells of dull damp weather)

spells of dull damp weather dust the plants with flowers of sulphur toward evening. This is excellent for preventing mildew and for holding slight attacks of the disease in check, but should it gain headway a better means of control is to spray with sulphide of potassium, 1/2 oz. to 2 gallons of water. The disease is easily detected as it forms a soft downy white coating especially prevalent on the leaves and near the thorns; it develops and increases with great rapidity and no time should be lost in combating it.

Black Spot. This is easier to prevent than it is to eradicate. Healthy, field-grown plants are not often attacked. Avoid the use of greenhouse stock for outdoor use as they are more subject to this disease which is induced by a damp atmosphere and a sudden drop of temperature. Pick off and burn diseased leaves.

It can be detected by the formation of black spots on the leaves which become discolored around the spot and fall to the ground. The fungus lives all winter in the dead leaves; therefore, the importance of carefully gathering and burning them, as otherwise they would be a source of infection the following spring. Spraying as soon as the disease is detected is sometimes effectual in keeping it under control; 1½ oz. of liver of sulphur dissolved in 1 gallon of water or Bordeaux Mixture might be tried. [135] Rust is easily recognized by the powdery orange patches which appear on the leaves, buds and wood.

Gather and burn affected leaves.

VARIETIES The following is a list of a few of the best varieties well known to the rose lover. Each year there are added attractions in the line of new varieties listed by rose dealers.