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Lilacs & Problems With Brown Leaves
Lilacs & Problems With Brown Leaves. Brown leaves on a lilac bush indicate health problems that arise from a number of sources. Many of these problems can be corrected with the right care and treatments. Lilacs with brown leaves are less likely to produce healthy growth or attractive clusters of flowers, and are more susceptible to contracting...
Brown leaves on a lilac bush indicate health problems that arise from a number of sources. Many of these problems can be corrected with the right care and treatments. Lilacs with brown leaves are less likely to produce healthy growth or attractive clusters of flowers, and are more susceptible to contracting further problems as the growing season progresses.
Growing Conditions of Lilacs
The area in which a lilac is grown plays a major part in the overall health of the plant and its leaves. Poor soil conditions, the wrong amount of light and a lack of water all contribute to brown leaves. Lilacs grow best in nutrient-rich, loamy soil and in full sun with fast-draining soil. Water lilacs regularly to prevent dehydration. Although lilacs grow under a variety of garden conditions, keeping the area healthy makes it less likely that lilacs will suffer brown leaves.
Lilac Bacterial Blight
Pseudomonas syringae is a type of bacterial blight that affects lilacs and seriously damages the leaves, which turn brown and black as the disease progresses. Bacterial blight occurs in periods of high temperatures and high humidity, and grows well in soil with excess nitrogen, as from improper fertilization. Prune lilacs below the affected area to stop the spread of bacterial blight, and disinfect your pruning shears between cuts. Plant resistant varieties of lilacs to avoid problems with bacterial blight.
Anthracnose and Lilacs
Lilacs sometimes suffer from a fungal disease called anthracnose, which grows in the soil and attacks the leaves of the lilac, turning them brown and causing wilt, premature leaf drop and death in severe cases. Anthracnose is treatable with fungicides and through pruning of the damaged portions of the lilac bush. Pick up and remove any fallen leaves or branches from the garden that can act as hosts to the fungus and allow it to continue growing.
Leaf Spot Diseases
Fungal leaf spot diseases are a problem for many ornamental plants, including lilacs. There are numerous fungal species that lead to the formation of brown patches on the leaves of lilacs. Control fungal leaf spot diseases by applying fungicide sprays beginning in the early spring to kill spores before they have a chance to grow on the leaves of the lilac. As with anthracnose, prune any damaged portions of the lilac to stop the disease from spreading.
