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Woolly Aphids - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Back to Insects-Apples and Pears Woolly aphids are aphids that produce a covering of fluffy white wax. One of the most common species found in landscapes is the woolly apple aphid (see photo above). It is most commonly found on crabapple feeding at the...

Woodpeckers and Sapsuckers

Back to Common Problems - Trees and Shrubs Back to Wildlife Woodpeckers belong to a unique group of birds that includes flickers and sapsuckers. In Maryland, one can commonly see the red-headed woodpecker, the downey woodpecker, the flicker, and sapsuckers. Occasionally, the pileated woodpecker,...

Shade Trees - Wilt Diseases

Internal vascular tissue discoloration from Verticillium wilt Back to Common Problems - Trees and Shrubs Wilting symptoms of shade trees can occur for a variety of reasons including winter injury, canker diseases, transplanting and establishment, drought and salt damage. Verticillium Wilt is a...

Water Sprouts Due to Branch Removal - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Water sprouts are vigorous, usually, upright shoots developing from dormant buds on the trunk or large branches of a tree. In many cases, pruning or removal of large branches stimulates dormant buds into growth. Heavy pruning results in more sprout...

Shade Tree - Viruses

(Back to Common Problems of Trees and Shrubs) Virus symptoms often include color changes in the leaves such as a mosaic or mottled pattern of light and dark green. Other color changes could appear as ring patterns of light green or necrotic areas. Additional symptoms include stunted or malformed...

Surface Roots - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Tree roots growing at or slightly above the soil surface are called surface roots. Surface roots can make it difficult to mow the lawn or grow grass. When trees and grass compete for moisture and nutrients, the tree roots usually win. Grass growing over or...

Spot Anthracnose of Dogwood or Elsinoë Leaf spot

Back to Common Problems - Trees and Shrubs The fungus Elsinoë corni causes a spot anthracnose primarily on Cornus florida . This disease should not be mistaken for another more serious dogwood disease called dogwood anthracnose caused by the fungus Discula destructiva . The disease can infect...

Slime Flux and Wetwood - Trees and Shrubs

Back to Common Problems - Trees and Shrubs The most obvious symptom is sap flowing from bark cracks or other wounds in the trunk or branches. This sap flow may be more abundant at certain times of the year or may stop entirely and then restart again. This condition will cause dark streaks on the...

Poor Plant Material - Trees and Shrubs

Back to Common Problems - Trees and Shrubs When a plant does not grow at the expected rate poor plant material may be responsible. Plants that are weak or damaged when planted may never overcome initial problems and will fail to thrive. Always choose top quality plant material. Inspect the roots,...

Poor Plant Care - Trees and Shrubs

Back to Common Problems - Trees and Shrubs There are several factors to consider when a plant does not grow at the expected rate: it may not be fully established, it may not have received proper care, or it may be poorly adapted to the site. A field-grown tree can lose up to 90% of its root system...

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