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Crabapples with vole damage. Note the English ivy being used as a ground cover. Photo: Tim Abbey, Penn State
English Ivy in the Landscape - Articles Articles
English ivy is an evergreen with dark green older foliage that has white veins, while new growth is a lighter green color. More
Stigmina Leaf Spot. Photo by Joseph OBrien, USDA Forest Service, Bugwood.org
Tree Diseases - Articles Articles

Tree Diseases

Tim Abbey

Living in the humid mid-Atlantic area, we have lots of fungal and bacterial diseases to contend with. More
Photo: Chris Evans, University of Illinois, Bugwood.org, Queen Anne's lace, wild carrot, Daucus carota
Wild Carrot or Queen Anne’s Lace - Articles Articles
Wild carrot or Queen Anne’s lace (Daucus carota) is a biennial. More
Horseweed. Photo: Bill Curran, Penn State
Horseweed—a Winter and Summer Annual - Articles Articles
Horseweed (Conyza canadensis) also known as marestail, reproduces by seeds. More
Photo: Howard F. Schwartz, Colorado State University, Bugwood.org, dandelion, Taraxacum officinale
Dandelion as a Landscape Weed - Articles Articles
Dandelion is a perennial weed of lawns, landscape ornamental beds, and nurseries. More
White grub damage in a residential lawn. Photo: N. Bosold, Penn State (retired)
White Grubs—Underground Marauders in Turf - Articles Articles
White grubs are probably one of the most common turfgrass insect pests encountered in Pennsylvania lawns. More
Photo: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org, Japanese barberry, Berberis thunbergii, Infestation
The Invasive Japanese Barberry - Articles Articles
Japanese barberry (Berberis thunbergii) is an invasive, non-native woody plant that can grow 3 to 6 feet tall with a similar width. More
Photo: James H. Miller & Ted Bodner, Southern Weed Science Society, Bugwood.org
Yellow Woodsorrel - Articles Articles

Yellow Woodsorrel

Tim Abbey

Yellow woodsorrel (Oxalis stricta) has foliage (composed of three leaflets) that resembles white clover or black medic. More
Photo: John D. Byrd; Mississippi State University, Bugwood.org
Yellow rocket - Articles Articles

Yellow rocket

Tim Abbey

Not all weeds get a “cool” common name, but yellow rocket (Barbarea vulgaris) is one of them. More
Photo: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org, wild garlic,Allium vineale
Wild Onion and Wild Garlic - Articles Articles
Wild garlic (Allium vineale) and onion (Allium canadense) are perennial plants that can be a weed in turfgrass and landscape beds. More
Twospotted spider mite (Tetranychus urticae) Photo: David Cappaert, Michigan State University, Bugwood.org
Twospotted Spider Mites - Articles Articles
One of our most common landscape pests is the two-spotted spider mite (Tetranychus urticae). More
Smooth groundcherry Physalis longifolia var. subglabrata Photo: Theodore Webster, USDA Agricultural Research Service, Bugwood.org
Smooth Groundcherry - Articles Articles

Smooth Groundcherry

Tim Abbey

Smooth groundcherry (Physalis longifolia var. subglabrata) is a perennial plant. More
Photo: Shepherd's-purse Capsella bursa-pastoris Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Shepherd's purse - Articles Articles

Shepherd's purse

Tim Abbey

Shepherd's purse (Capsella bursa-pastoris) is a winter annual. More
Pineapple-weed (Matricaria discoidea) Photo: John D. Byrd, Mississippi State University, Bugwood.org
Pineappleweed - Articles Articles

Pineappleweed

Tim Abbey

Pineappleweed can be either a summer or winter annual. More
Photo: John Cardina, The Ohio State University, Bugwood.org poison-hemlock Conium maculatum plant
Poison Hemlock - Articles Articles

Poison Hemlock

Tim Abbey

Poison hemlock (Conium maculatum) appears to have become more abundant over the past few years. More
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