In some cases, the center of the leaf spot will dry up and fall out, giving the leaf a "shot hole" appearance.Bacterial leaf spot diseases often start as small dark brown to black spots with a halo of yellow tissue surrounding each spot.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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Hire a professional arborist to treat leaf spot diseases in large trees.High-pressure spraying equipment is needed in order to get complete coverage of the canopy of large trees.Proper timing of fungicide applications can vary depending on the biology of the disease.Fungicides are protective and need to be applied before symptoms appear on the leaves.Fungicides are not necessary unless a tree has lost all of its leaves several years in a row.Do not fertilize trees and shrubs suffering from leaf spot diseases, unless it is recommended by a soil test to correct a nutrient deficiency.Annually reapply mulch and inspect to ensure levels are maintained.Do not mound the mulch around the trunk of the tree but lay a flat layer with at least a 2-inch space between the mulch and stem to allow for air movement.
Maintain a 3- to 4-inch-deep layer of mulch around your tree.Soil should be allowed to dry before watering again.Water your tree throughout the growing season so that the top 6 to 8 inches of the soil is moist, especially during dry summer periods.A drip or soaker hose works best for this. Wet conditions promote disease, so water trees at the base and be careful not to splash water on leaves.Prune trees or shrubs to increase light penetration and improve air circulation throughout the canopy.Do not overcrowd plants - use size at maturity as a spacing guide when planting.Rake up and destroy fallen leaves before the first snowfall to eliminate locations where diseases can survive to re-infect the plant the following growing season.Leaf spot diseases will not seriously harm your plants, but there are things you can do that when done together, can reduce the disease on the tree in following years. Marssonina leaf spot Managing leaf spot diseases
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