University of Maryland Extension

Home and Garden Information Center

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Natural Gas Injury - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Natural gas, composed mostly of methane, is not directly toxic to plants, however when a gas leak occurs it displaces the oxygen in the soil pore spaces. This can lead to development of anaerobic conditions and eventually the production of hydrogen sulfide...

Natural Decline - Trees and Shrubs

Back to Common Problems - Trees and Shrubs A tree that is in decline lacks vigor, has reduced growth and shows other stress symptoms. You may also notice small leaf size, wilt, leaf scorch, early fall color, early leaf drop, and/or dieback. Other symptoms include abnormally large crops of fruit or...

Leafhoppers - Trees and Shrubs

Photo: Leafhopper damage on maple Back to Common Problems - Trees and Shrubs Adults of most leafhoppers are one-eighth to one-fourth inch long, slender and hold the wings roof-like over the back. Many have angular, pointed heads. Immature leafhoppers, or nymphs are similar to the adults but smaller...

Leafminers - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Leaf miners feed on leaf tissue between the upper and lower surfaces of a leaf. They may be the immature stages of moths (caterpillars), beetles, flies or sawflies. Most cause little damage. Several are pests of shade trees. These include the holly leaf...

Featured Plants - Fruits

The plants below were featured in prior months on the Home and Garden Information Center's Featured Plants. Current selections can be found on the Featured Plants page . Apple Strawberries

Beech Bark Disease

Beech Bark Disease (BBD) complex consists of two organisms, a scale insect and a fungal pathogen, which together create entry wounds and infection that kill beech trees.

Leaf Beetles - Trees

The imported willow leaf beetle Back to Common Problems - Trees and Shrubs Related Publications: (PDF) Locust Leafminer (HG 3) (PDF) Elm Leaf Beetle (HG 113) ****Invasive Beetle****- Viburnum leaf beetle Leaf beetles feed on the foliage of plants as adults, larvae or both. Feeding by the adults...

Gypsy Moth

Gypsy moth is the most serious pest of oak trees. Gypsy moth prefers oak but will also feed on sweet gum, linden, willow, birch, apple, alder, boxelder, and hawthorn. Adult female moths are white with black spots and cannot fly. They lay feltlike tan egg masses on trees, rocks or wherever they can...

Graft Failure and Normal Graft Bulging - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Graft Failure Graft incompatibility, improper technique, or environmental conditions, may cause graft failure. Graft incompatibility is not clearly understood but may be the result of genetic differences between the grafted parts. Abnormalities may develop...

Grade Changes - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Adding or removing soil over tree roots can seriously damage them and jeopardize the health of the tree. Increasing the soil depth over tree roots changes the oxygen exchange between the roots and the soil surface, causing dieback of tree branches...

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