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A leaf spot is a limited, discoloured, diseased area of a leaf that is caused by fungal, bacterial or viral plant diseases, or by injuries from nematodes, insects, environmental factors, toxicity or herbicides. These discoloured spots or lesions often have a centre of necrosis (cell death). [1] .
What causes Leaf Spot Diseases? Leaf spot diseases are primarily caused by pathogenic fungi, though some are caused by bacteria. These pathogens exploit the leaf’s surface and, once established, can quickly proliferate, producing visible spots or lesions. Here are the main causes of leaf spot diseases:
17 lip 2024 · Leaf spots on plants often develop in cool and wet conditions, such as those in early spring. In this article, we will explore the different types of leaf spot and suggest some tips about how it can be treated. What Causes Leaf Spots? Fungi.
One good way to determine the likely cause of leaf spots is by color. Black leaf spots: Most likely to be leaf spot disease (fungal or bacterial). Red leaf spots: Most likely to be fungal leaf spot disease or a nutrient deficiency. Grey leaf spots: Most likely to be fungal leaf spot disease.
29 sie 2023 · What causes leaf spot? Fungal or bacterial infections cause leaf spot, environmental factors such as excessive moisture or humidity, and poor plant hygiene. How can I identify leaf spot on my plants? You can identify leaf spot by observing small, dark spots or lesions on the leaves of your plants, often surrounded by a yellow halo.
15 maj 2021 · Leaf Spots. Leaf spots, also known as leaf blotch, anthracnose, shot hole, and scab, are typically obvious spots, characterized by alternating shapes, sizes, and shadings. This spot whose causative agents are fungi or bacteria is mostly encircled consistently by a yellow halo - an unmistakable edge, that’s effortlessly noticeable.
Bacterial leaf spot is a plant disease that causes spots, often water-soaked, that spread across the plants’ foliage. Spots can be yellow, brown, or black. Infestations start small, appearing on just the foliage, fruit, or stems at first.
