Weed Identification and Control

Information on weed identification and control, including catsear, marestail, purple loosestrife, pokeweed, pigweed, poison ivy, crabgrass, hemlock, purslane and multiflora rose. Tips on various herbicides and integrated pest management.

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Purple Loosestrife – A Noxious Weed
Purple Loosestrife – A Noxious Weed - Articles Articles
Recently, some folks pulled into the local nursery, asking about the pretty pink flowering plants that were blooming along the fields and roadsides. More
Photo of horseweed taken in early November. Curran, Penn State
How Late Can I Control Weeds in the Fall? - Articles Articles

How Late Can I Control Weeds in the Fall?

Dwight Lingenfelter, William S. Curran, Ph.D.

How late can an herbicide application be made in the fall and still be effective? We provide comments about controlling perennials and winter annual weeds. 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
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: 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
Using Nature's Signals to Manage Landscape Pests
Using Nature's Signals to Manage Landscape Pests - Articles Articles
The best way to make an effective pesticide application is to observe pest development at the site through regular monitoring. More
Monitor Pests and Keep Records
Monitor Pests and Keep Records - Articles Articles

Monitor Pests and Keep Records

Emelie Swackhamer, J. Robert Nuss, Larry Kuhns

Inspecting your plants on a regular basis is essential to identifying and evaluating plant problems in their early stages. More
Mile-a-minute
Mile-a-minute - Articles Articles

Mile-a-minute

David R. Jackson

Mile-a-minute is an invasive, noxious weed from eastern Asia that is rapidly colonizing non-crop areas in Pennsylvania and surrounding states. 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: Chris Evans, University of Illinois, Bugwood.org, annual sowthistle, Sonchus oleraceus
Annual Sowthistle - Articles Articles
Annual sowthistle (Sonchus olearaceus) is one of the annual thistles. 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