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The most common cause of bacterial leaf spots are by bacteria in the genera Pseudomonas and Xanthomonas. For example, Pseudomonas syringae pv. tabaci is known to cause angular leaf spots of cucumber, Pseudomonas syringae pv. phaseolicola to cause bean leaf spot and Xanthomonas campestris pv. phaseoli, angular leaf spot of cotton. [7]
This disease affects strawberry plant foliage causing purple spots 1 ⁄ 8 to 1 ⁄ 4 in (3.2 to 6.4 mm) in diameter across on the upper side of the leaves. [3] At first, the whole spot is purple but as the disease matures the center of the leaf spots on older leaves become tan or gray, then almost white. Lesions on younger leaves remain light ...
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]
These are the most common causes of brown spots on fiddle leaf fig foliage, plus simple tips for restoring your plant’s health. ... plus simple tips for restoring your plant’s health.
Fungal diseases; Common name: Scientific name: Plants affected: Alternaria leaf spot Alternaria panax: B, D, Fl, P,S Anthracnose Colletotrichum trichellum: H Cercospora leaf spot Cercospora spp. B, S Damping-off Pythium spp. B,Fj,S Gray mold Botrytis cinerea: H Phyllosticta leaf spot Phyllosticta concentrica. Discochora philoprina [teleomorph] H
Black leaf, also known as black spot disease can be caused by different types of fungi and bacteria. Most common being Asterina, Asterinella, Diplotheca, Glomerella, Gnomonia, Schizothyrium, Placosphaeria, and Stigmea. Black leaf can affect many different plant species in a wet, damp climate. It may appear as black spots on leaves, stems, and ...
The lesions continue to grow, and by the end of summer form leaf spots that look like tar. [2] The spot can grow up to 1.5 inches (4 cm) in diameter. [4] A microscopic sign of the pathogen are the stroma, mats of hyphae found in the lesions. [2] These lesions can cause senescence of leaves but are mostly of cosmetic importance.
The disease attacks during the summer months and causes yellow or orange spots to grow on the leaves of the cotton plant. These spots can cause defoliation, premature openings, broken stems, and reduced yield. [77] Crops with severe outbreaks have been known to incur losses of up to 50%. [76] This disease is controlled with applications of ...