University of Maryland Extension

Home and Garden Information Center

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Viruses of Houseplants

Back to Common Problems - Houseplants Symptoms of virus infections include necrotic spots, abnormal dark green and light green mosaic and mottling patterns of leaves (orchid leaf), distorted or stunted growth, necrotic, or yellow ring patterns on the foliage, enations or bump like growths, and...

Stem Cankers of Houseplants

Back to Common Problems - Houseplants Cankers or lesions on stem can be caused by fungal and bacterial pathogens. The symptoms usually include a dark sunken area on a stem or branch that encircles or girdles the tissue and kills the remaining stem portion. The plant may appear yellowed or wilted if...

Root Rots of Houseplants

Back to Common Problems - Houseplants Symptoms of root rots/crown rots include yellowing, browning, and dieback of the leaves and browning or blackening of the crown and or roots and poor growth. Both may also cause wilting. The most common causes of root rots caused by fungal pathogens are:...

Powdery Mildew on Houseplants

Back to Common Problems - Houseplants There are several fungal species that cause powdery mildew of house plants, but the symptoms are the same. The most obvious symptom is the white powdery coating on the surfaces of infected leaves and stems. The initial areas of mildew may start out as small...

Gray Mold or Botrytis on Houseplants

Back to Common Problems - Houseplants Gray mold or Botrytis blight often begins with relatively large grayish to tan areas on older leaves or spent flowers. The dusty gray spores of the fungus are easily seen and infected areas can rapidly enlarge and cause tissue collapse. This fungus primarily...

Fungal Leaf Spot Diseases on Houseplants

Back to Common Problems - Houseplants There are many species of fungi that can cause leaf spots on house plants (leaf spot on prayer plant). Symptoms often include many tan to reddish brown to black roughly circular spots or lesions that may run together to cause large irregular shaped lesions (...

Bacterial Leaf Spots of Houseplants

Back to Common Problems - Houseplants There are several species of bacteria that attack houseplants. Some of these bacterial infections become systemic throughout the plant while others will remain as localized lesions. Bacterial disease symptoms range from black to brown, often watery leaf spots...

Skunks

Back to Common Problems - Lawns Back to Wildlife The skunk is a larger member of the weasel family and can grow to be about 30 inches long (tail included) and weigh about 8 pounds. Their natural habitat is around clearings, pastures and along the edge of forests. They usually nest under a hollow...

Moles - Lawns

Back to Common Problems - Lawns The Eastern mole is often thought to be a rodent. However, it is not a rodent, but an insectivore related to shrews and bats. Moles consume 70 to 100 percent of their body weight in insects (mostly grubs and worms) each day. They must eat constantly to maintain the...

Sod Webworm - Lawns

Back to Common Problems - Lawns Sod webworms are a complex of over 20 species of Pyralid moths across the U.S. Two species that have occurred in outbreak situations are the bluegrass webworm and the larger sod webworm. The caterpillars are the damaging stage of these moths. Caterpillars range in...

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