![]() Some leaf spot pathogens cause leaves to drop prematurely, resulting in the tree or shrub losing most or all of its leaves.īacterial leaf blight of lilac Symptoms of bacterial leaf spot.At the center of larger leaf spots, it is possible to see signs of the pathogen such as fungal spores or spore-producing structures.Smaller leaf spots are younger infections. Larger leaf spots are older infections.A variety of sizes of leaf spots may be observed on one plant.Colors can range from yellow to yellow-green to orange-red to light tan, brown or black.Leaf spots may be angular or rounded, raised or sunken, and have smooth or fringed edges.Depending upon the pathogen, leaf spots may occur on the upper, lower or both surfaces of the leaves.Spots occur randomly on the leaf surface because the pathogens that cause leaf spots are blown there by wind or splashed by rain or irrigation.Leaf spot diseases usually are seen first on the lower and inner branches where humidity is higher and leaves are shaded.Leaf spots come in a wide variety of shapes, sizes and colors. ![]()
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