University of Maryland Extension

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Edema - Houseplants

Back to Common Problems - Houseplants Edema is a condition caused by the imbalance of water use by the plant and water uptake by the roots. Symptoms : Plants may develop wart-like or crusty raised bumps on the lower leaf surfaces. The bumps may become brown or necrotic and may be misdiagnosed as...

Dull Mower Blade/Mower Injury - Lawns

Back to Common Problems - Lawns Mowing injury may be direct physical damage or it may cause lawn deterioration due to poor mowing practices. A dull mower blade may cause the turf to have a brown cast or look ragged after mowing and can make turf more susceptible to disease. Sharpen or replace mower...

Drought Stress - Houseplants

Back to Common Problems - Houseplants Drought : Plants wilt and leaves curl when roots are unable to supply sufficient moisture to the stems and leaves. Wilting for short periods of time does not harm plants. Sometimes a plant wilts on a hot day because moisture is evaporating from the leaves...

Cultural Problems/Leaf Yellowing - Houseplants

Back to Common Problems - Houseplants Leaf yellowing is often one of the first symptoms of plant stress. If the stress causing condition is not alleviated, yellow leaves may turn brown. A prolonged period of environmental stress causes overall stunting and poor growth. Noticing the pattern and...

Algae and Fungal Growth on Growing Media Surfaces - Houseplants

Back to Common Problems - Houseplants Algae are single to multicelled aquatic plants that can grow under moist conditions and form a greenish layer on the surface of the growing media. Fungi are usually multicelled organisms that will also grow on the growing media surfaces under moist conditions...

Drought Damage - Lawn

Back To Common Problems - Lawns Lawns composed mostly of turf-type tall fescue will withstand drought conditions unless they are newly seeded or sodded. Established fescue and bluegrass lawns should not be irrigated. Light, frequent watering is harmful because it encourages shallow rooting. Fescue...

Dog Urine - Lawns

Back to Common Problems - Lawns Deep green patches or straw colored patches surrounded by a ring of dark green turf may indicate dog urine damage to the lawn. Affected areas are usually circular and six to ten inches in diameter. Damage to lawns from dog urine is variable because the concentration...

Chemical Injury - Lawns

Back to Common Problems - Lawns Chemical injury on lawns is often associated with the misapplication of chemicals that are labeled for use on lawns. Common lawn herbicides are available under different trade names with varying formulations and concentrations. For this reason is extremely important...

Buried Debris - Lawns

Back to Common Problems - Lawns Patches of dead or dormant grass that cannot be attributed to insect or disease damage may be due to buried rocks or debris. Buried debris is more of a problem in lawns associated with recent construction. Man-made debris or naturally occurring rocks that were...

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...

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