Water-soaked areas on leaves, small reddish-brown leaf spots, shriveling leaflets and black fruiting bodies on leaf undersides are all symptoms of the fungus disease Guignardia leaf blotch. While it’s most commonly found on Horsechestnut trees, Buckeye trees are also affected. Severely infected trees will drop their leaves early in the season. Damage is mainly aesthetic, since severe symptoms commonly occur later in the season when tree growth is nearly finished for the year. Severe disease infections will cause early leaf drop and an unattractive tree, which is undesirable for many homeowners. There are a variety of methods for controlling this disease, beginning in the spring and continuing through fall.

Spring – KTS offers a series of three fungicide sprays, beginning in early spring, soon after the tree leaves have begun emerging. The fungicide sprays will help maintain tree appearance and keep disease symptoms at bay.

Summer – Properly prune the tree to allow air to flow freely throughout the tree canopy. In addition, any nearby landscape plants should also be pruned for better air flow. This allows foliage to dry out and prevents the disease from spreading.

Fall – Remove fallen tree leaves from the landscape as soon as possible. The fungus overwinters on infected leaves and will release spores the following spring, to re-infect the tree. Fall leaf clean-up will slow the spread of fungal spores.

Following this seasonal schedule helps ensure the infected tree maintains a healthy appearance and slows the spread of Horsechestnut Leaf Blotch. Call the Plant Health Care department at KTS if you suspect your tree is infected. KTS offers the services of Certified Arborists that are able to properly evaluate and diagnose tree infestations and diseases. In addition, we offer professional pruning and tree health care services and treatments.

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