See All Pest, Disease and Weed Identification

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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
Figure 1. Lodged corn seen from a distance.
Corn rootworms Suspected of Resistance to Bt Corn Varieties Discovered - Articles Articles
Western corn rootworms that developed resistance to some Bt corn varieties may now be a problem in PA. 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
Photo: Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org eastern poison-ivy Toxicodendron radicans
Poison-Ivy - Articles Articles

Poison-Ivy

Tim Abbey

Poison-ivy (Toxicodendron radicans) is a native woody, perennial vine. More
Photo: Bruce Ackley, The Ohio State University, Bugwood.org prostrate knotweed Polygonum aviculare
Prostrate Knotweed - Articles Articles

Prostrate Knotweed

Tim Abbey

Prostrate knotweed (Polygonum aviculare) is a summer annual. More
Photo: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org common purslane Portulaca oleracea
Purslane - Articles Articles

Purslane

Tim Abbey

Purslane (Portulaca oleracea) is a summer annual that forms low growing mats of succulent stems and leaves. More
Photo: Chris Evans, Illinois Wildlife Action Plan, Bugwood.org, catchweed bedstraw, Galium aparine
Catchweed Bedstraw - Articles Articles

Catchweed Bedstraw

Tim Abbey

Catchweed bedstraw (Galium aparine) is an annual that can form dense mats of vegetation. More
Photo: Robert Vidki, Doronicum Kft., Bugwood.org henbit Lamium amplexicaule
Henbit—a Common Winter Annual - Articles Articles
Henbit (Lamium amplexicaule), like many of our common weed species, grows in many areas – lawns, landscape plantings, nursery containers, and unmanaged sites. More
Impatiens, Downy Mildew - sporulation closeup, photo: Gary Moorman
Overview of Plant Diagnostics - Articles Articles
Getting to the bottom of a plant problem can be a challenge. More
quackgrass Elymus repens Stem(s) Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Orchardgrass and Quackgrass - Articles Articles
A number of grass species appear in lawns and ornamental beds and are considered weeds. More
Photo: Mark Czarnota, University of Georgia, Bugwood.org
Mulberry Weed - Articles Articles

Mulberry Weed

Tim Abbey

A weed that has been spreading in recent years in the nursery and landscape trade is mulberry weed. More
Photo: Karan A. Rawlins, University of Georgia, Bugwood.org
Black Medic - Articles Articles

Black Medic

Tim Abbey

Black medic (Medicago lupulina) is a spreading, low growing summer annual. More
Photo: Tim Abbey
Common Pokeweed Identification and Management - Articles Articles
Pokeweed can be a weed in landscape beds and nurseries. More
Photo: Michael Bohne, Bugwood.org, University of Georgia; Male Asian longhorned beetle
Check Those Plants for Invasive Pests - Articles Articles
Invasive species have drawn considerable regional and national attention in recent years. More
Photo: Loke T. Kok, Virginia Polytechnic Institute and State University, Bugwood.org, bull thistle, Cirsium vulgare
Bull Thistle Identification and Management - Articles Articles
Bull thistle (Cirsium vulgare) is a biennial that true to its name, has notable spines. This plant is much different than Canada thistle. More
Photo: Chris Evans, University of Illinois, Bugwood.org, annual sowthistle, Sonchus oleraceus
Annual Sowthistle - Articles Articles

Annual Sowthistle

Tim Abbey

Annual sowthistle (Sonchus olearaceus) is one of the annual thistles. More
Mourad Louadfel, Bugwood.org
Keep an Eye Out for Cereal Leaf Beetle - Articles Articles
Scout now for infestations of cereal leaf beetle in small grain fields. The larval stage feeds on the leaves and fields appear white if heavily infested. More
Assessing Soybean Fields for Insect Damage
Assessing Soybean Fields for Insect Damage - Articles Articles
This time of year (July) a suite of insect pest species are feeding upon soybean foliage. More
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