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The black spots are circular with a perforated edge, and reach a diameter of 14 mm (1 ⁄ 2 inch). Badly affected plants, however, will not show the circular patterning, as they combine to cause a large, black mass. The common treatment of the disease is to remove the affected leaves and spray with antifungal solutions.
Best method of treatment is removal of infected tissue. [10] Anthracnose: a group of fungal diseases that cause leaf spots, blotches, dieback, and others. Spreads in wet conditions. [11] Black rot: fungal disease that spreads quickly through plant tissue, turning it black. Spreads by splashing water between affected plants. [12]
Treating black leaf disease can be achieved in many ways. Some include removing each affected leaf of any yellow or black color. If the infection has spread throughout a larger area, it may be best to remove the affected limb of the plant to reduce further spread. Fungicides may be used as treatment. There are a number of remedies used to ...
Affected leaves fall prior to healthy ones and plants may be defoliated in serious infections. Anthracnose Sphaceloma rosarum on Rosa rugosa. Anthracnose Sphaceloma rosarum – Spots caused by this fungus originate from a point where leaves are water soaked, usually unnoticeable at first, until they turn black with a very distinct defined edge ...
However, leaf spots may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms. Blights are often named after their causative agent. For example, Colletotrichum blight is named after the fungus Colletotrichum capsici, and Phytophthora blight is named after the water mold Phytophthora parasitica. [11]
Transpiration increases in affected plants. This is because in leaf spots, the plant cuticle, epidermis, and cell tissues, including the xylem may be destroyed in the infected areas. The cuticle protects the leaf and the destruction of these cell tissues results in an uncontrollable loss of water from the affected areas.
Halo blight causes small water-soaked spots on leaves. These spot progressively turn dark brown and are surrounded by a wide greenish yellow halo. The necrotic spots remain small unlike that of common blight. [4] Similar to foliage symptoms, halo blights causes water-soaked spots on vegetative pods. It also causes streaks along pod sutures.
Black rot is a name used for various diseases of cultivated plants caused by fungi or bacteria, producing dark brown discoloration and decay in the leaves of fruit and vegetables: A disease of the apple, pear and quince caused by a fungus ( Botryosphaeria obtusa or Physalospora cydoniae )