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Why Is Leyland Cypress Turning Brown? Winter Took Its Toll

Leyland cypress (x Cupressocyparis leylandii) has a lot going for it. It’s fast-growing with evergreen, feathery foliage and a pleasing, slender profile. It makes an excellent specimen tree or screening plant. A cross between two Pacific coast species, the Leyland cypress thrives…

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What’s Wrong with My Blue Spruce Tree?

Dr. Dave Clement, University of Maryland Extension Plant Pathologist, explains two common diseases of this popular evergreen tree.  Colorado blue spruce trees, although not native or adapted to Maryland, are commonly planted in landscapes for their attractive color and shape….

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Why are Oaks Declining? Dr. Dave Describes 3 Oak Diseases

We’ve recently received inquiries about oak trees declining and dying. People usually want to know if this is caused by oak wilt. Importantly, oak wilt is not known to occur widely in Maryland. Two common leaf diseases of oaks in…

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Wilted Plants? Check for Signs of Southern Blight

Southern blight is a plant disease that is active now in hot summer weather. It is caused by a fungus called Sclerotium rolfsii. This fungus has a wide host range including woody plants, vegetables and herbs, and ornamental perennials such as…

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Brown Patch in Maryland Lawns

Along with the start of summer time comes a common lawn disease for Maryland homeowners’ lawns called brown patch. The disease is caused by several fungal species of Rhizoctonia.  Rainy summers are worse, but even drier summers have brown patch…

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