How To Control Black Spot On Roses
Once your rose bush gets attacked by the black spot fungus its markings are there to stay until the marked leaves fall off and a new leaf is generated.
Black spot on roses is a common problem in warm climates and is a result of high humidity, poor air circulation, poor light and poor hygiene. To control it, firstly apply sulphate of potash at a rate of 150g per plant and repeat this every 3 months.
Black Spot on Roses
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Researchers at Texs A&M have discovered that cornmeal has powerful fungicidal properties and is effective on all kinds of landscape fungus problems, from turf grass to black spot on roses.
Garlic: Sprays made from aqueous garlic extracts have antibiotic and antifungal properties and will suppress a number of plant diseases, including powdery mildew on cucumbers and, to some extent, black spot on roses.
 See also: Plant, Black spot, Water, Organic, Fungi
  
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