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Marssonina rosae
Leaf spots are easily seen and may be serious on roses, which is very commonly attacked by black spot. Spores are easily spread by water splash and infections take hold when the water remains on the leaf for about 6-7 hours. Areas with high summer rainfall and high humidity usually have the highest incidence of black spot.
Circular black spots on the leaves which are fringed with yellow margins. The spots are black and can also appear on the stems. The leaves will fall prematurely and if left unchecked can lead to defoliation of the plant.
Treatment of the disease is year round as the fungus overwinters on stems and leaf litter. All diseased leaves should be raked up and disposed of. Diseased stems need to be pruned back to healthy wood. Spray roses with Yates Lime Sulfur Concentrate in winter and start an early preventative spray program at the beginning of spring once foliage emerges.
A systemic fungicide and contact insecticide, kills pests and mites on contact and systemically works from within the plant to control black spot, powdery mildew and rust on roses and ornamentals in the home garden.
A systemic fungicide and contact insecticide, kills pests and mites on contact and systemically works from within the plant to control black spot, powdery mildew and rust on roses and ornamentals in the home garden.
A broad spectrum fungicide that works systemically within the plant, providing both protectant and curative activity to prevent and control fungal diseases.
Forms a protective film of sulfur which helps prevent the entry of fungus into fruit trees and ornamental plants.
Powdery mildew is a fungus which spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants-usually the older leaves.
Downy Mildew is often more widespread in younger plants and is recognised by downy, whitish tufts or spores on the underside of the leaves.
Sooty mould is a fungal disease which presents as a black powdery substance coating plant leaves, stems and twigs usually accompanied by a sticky residue.
Aphids are small, sap-sucking insects which can cause a lot of damage to your plants. They can be black, green, red-pink and translucent white and are often found grouped on new shoots and buds.
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