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Anthracnose - Annuals, Bulbs, Groundcovers, Perennials and Vines

Anthracnose dark colored sunken lesions on stem Anthracnose symptoms typically appear as dark-colored spots or sunken lesions that can quickly run together to form irregular dark lesions that cause rapid blighting of leaves or stems. This blighting can result in severe plant losses if not diagnosed...

Toxic or Sour Mulch/Wood Alcohol

Occasionally the leaves of shrubs, annuals or perennials may become bleached, scorched or chlorotic after a fresh application of wood mulch products. This problem is caused by "Wood Alcohol Syndrome", also called "Sour Mulch". Problems with wood mulch can occur when it is stored in very large piles...

Storm Damage - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Hosta leaves damaged in a hail storm Storms with strong winds, hail or heavy rains may knock over and flatten flowering plants or herbs during the growing season. To prevent damage during sudden storms, determine which garden plants require or benefit from staking and do so early in the growing...

Pesticide Burn (Phytotoxicity) - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Pesticide burn, or phytotoxicity, is caused by misuse or misapplication of chemicals on plants. Symptoms included leaf spots, blotches, scorch or tip burn. Symptoms are sometimes confused with disease, insect or mite damage or problems caused by environmental conditions. Pesticide burn may also...

Natural Senescence of Older Leaves - Flowers/Vegetables

Back to Yellowing/Browning of Leaves Natural Senescence of Older Leaves The yellowing of a few lower leaves may be attributed to natural leaf aging. Many plants normally shed lower (older) leaves as the plant grows. Senescence is defined as the normal decline or degeneration of leaf tissue due to a...

Volutella Dieback of Pachysandra - Groundcover

Symtoms of volutella ***It is no longer recommended to plant Pachysandra terminalis (Japanese spurge), especially near or adjacent to natural areas, because it is an alien invasive plant*** http://www.invasiveplantatlas.org/subject.html?sub=3058 The disease symptoms of this fungal disease on...

Southern Blight - Flowers/Groundcovers

The collapse of a groundcover from southern blight When a plant or part of the plant (leaf, flower, fruit) rapidly collapses and dies this is called blight. Many bacteria, fungi, and viruses can cause blights. Most blights are favored by certain weather conditions, such as hot and humid or cool and...

Rhizoctonia Web Blight - Flowers/Groundcovers

Sweet woodruff infected with Rhizoctonia The typical symptoms of this fungal disease are a rapid blighting or dieback of the foliage during hot humid conditions. The infected plants may turn dark brown or black and will often quickly collapse. The pathogen can be seen on blighted tissue as a fine...

Powdery Mildew - Annuals, Bulbs, Groundcover, Perennials, and Vines

Back to Powdery Mildew - Trees and Shrubs Powdery mildew is the common name for the disease and symptoms caused by a closely related group of fungi. These fungi grow on the upper and lower leaf surfaces, young stems, shoot tips, flower buds and/or blossoms of plants. As they grow, they produce...

Phomopsis and Phoma Dieback of Vinca - Groundcover

Initial wilting symptoms on vinca. ***It is no longer recommended to plant Vinca minor (Periwinkle or Vinca), especially near or adjacent to natural areas because it is an alien invasive plant*** http://www.nps.gov/plants/alien/pubs/midatlantic/vimi.htm The usual symptoms on vinca include wilted...

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