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Drought - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines Drought: Plants wilt 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...

Leaf Yellowing/Cultural Factors - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Impatiens with nutrient deficiency Back to Common Problems - Annuals, Bulbs, Groundcover, Perennials, and Vines A plant problem that is not caused by a living organism is called "abiotic" injury. Sometimes gardening practices (cultural factors), such as lack of soil preparation, improper planting...

Air Pollution - Annuals, Bulbs, Groundcovers, Perennials and Vines

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines Air pollution damage is more common in urban areas but can also occur in suburban and rural areas downwind of industrial sites. The severity of plant damage caused by air pollution varies with the time of day and with...

Whiteflies - Houseplants

Back to Common Problems - Houseplants Adult whiteflies resemble tiny white moths. They are about 1/16th of an inch long, white, with four wings, and may be covered with a powdery white wax. The nymphs or immature whiteflies resemble flat disks on the undersides of the leaves and may or may not be...

Thrips - Houseplants

Back to Common Problems - Houseplants Thrips are very tiny insects, 1-2mm long. They are slender with narrow wings fringed with hairs. They may be white, yellow, brown or black. The immatures are smaller and usually white or yellow. There are several generations. Some species overwinter in the soil...

Spider Mites - Houseplants

Heavy mite infestation with webbing. Back to Common Problems - Houseplants Spider mites are very tiny plant pests that are related to spiders. They feed only on plants. The colors may be reddish or light green with two dark spots. They are about the size of a period on a page. Spider mites can be a...

Scale Insects - Houseplants

Back to Common Problems - Houseplants Soft scales are sucking insects that attack a wide variety of plants. Heavy infestations may cause leaf yellowing, stunting, and dieback. Soft scales such as brown soft scale and the hemispherical scale are common pests of houseplants. They appear as raised...

Mealybugs - Houseplants

Mealybugs on potted cycad Back to Common Problems - Houseplants Mealybugs are covered with a powdery wax and the body tapers towards the tail. They may have waxy tufts around the body margin and several tails at the rear end. Mealybugs may be found at rest or slowly crawling on the undersides of...

Fungus Gnats - Houseplants

Back to Common Problems - Houseplants Fungus gnats are tiny, black flies that are commonly seen around lamps and windows. They are annoying, but harmless. The larvae breed in moist soil, primarily in potted plants containing soil rich in organic matter. Larvae feed on fungi in the moist soil...

Aphids - Houseplants

Back to Common Problems - Houseplants Aphids are small, soft-bodied insects, of various colors, some may be covered with fluffy white wax. They have long, slender mouthparts, which they use to suck out plant fluids. This feeding causes curling and wilting of the leaves. They may also feed on...

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