Apply sulfur sprays or copper-based fungicides weekly at first sign of disease to prevent its spread. These organic fungicides will not kill leaf spot, but prevent the spores from germinating. Safely treat most fungal and bacterial diseases with SERENADE Garden.
Thereof, what is the black spot disease?
Black spot on rose leaves W.H. Hodge. Black spot of roses is a serious widespread disease caused by the fungus Diplocarpon rosae. On rose plants, the spots are roundish and up to 1 cm (0.5 inch) in diameter with fringed margins.
What does it mean when there are black spots on leaves?
The majority of leaf spots are caused by fungi, but some are caused by bacteria. Some insects also cause damage that appears like a leaf spot disease. Leaf spots on trees are very common and generally do not require spraying. Leaf spot may result in some defoliation of a plant.
Why are the leaves turning black?
Plant leaves turn black for a number of reasons, including environmental factors and bacterial infections. However, most of the problems that cause black leaves in plants are irreversible. In every case, prevention is the best way to deal with the disease and dehydration that are common factors in blackened leaves.