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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Keeping greenhouses free of weeds helps control diseases and insect pests.
Zero Tolerance for Weeds in the Greenhouse - Articles Articles
"Don't let weeds grow in the greenhouse." Growers know it, customers sense it, and Extension educators preach it. But is zero tolerance for weeds attainable? More
Harrington Seed Destructor
Harrington Seed Destructor - Videos Videos
Penn State is involved in research on Harvest Weed Seed Control for herbicide resistant weeds. Here, the HSD is described as it operates during harvest. More
Veronicastrum virginicum - culver's root
Weeds in the Fields - Articles Articles

Weeds in the Fields

Mary Ann Ryan

When driving, we often see flowering weeds in fields or roadsides. Casual walks along a country road may cause us to stop and check out the weeds of summer. 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: Bruce Ackley, The Ohio State University, Bugwood.org Annual Bluegrass
Suppression of Annual Bluegrass or Crabgrass - Articles Articles

Suppression of Annual Bluegrass or Crabgrass

Tanner Delvalle, Peter Landschoot, Ph.D., Jeff Borger, M.S.

Seedbed establishment for fine turf can be extremely difficult, and is often considered an art form. 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
Smooth groundcherry Physalis longifolia var. subglabrata Photo: Theodore Webster, USDA Agricultural Research Service, Bugwood.org
Smooth Groundcherry - Articles Articles
Smooth groundcherry (Physalis longifolia var. subglabrata) is a perennial plant. 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
Newly emerged pigweeds in Berks Co., June 13, 2017 (Photo: Annie Klodd, Penn State)
Palmer Amaranth and Waterhemp Beginning to Emerge - News News
Palmer amaranth and waterhemp have emerged for the season in Pennsylvania. It is important to scout for these invasive weeds now, and control them before they reach 4 inches tall. More
Joseph LaForest, University of Georgia, Bugwood.org
Juniper Scale - Articles Articles
The juniper scale, native to Europe, is now found throughout the United States. This key pest attacks junipers, cypresses, falsecypress, and incense cedar in landscapes and nurseries. More
Photo: Chris Evans, Illinois Wildlife Action Plan, Bugwood.org, catchweed bedstraw, Galium aparine
Catchweed Bedstraw - Articles Articles
Catchweed bedstraw (Galium aparine) is an annual that can form dense mats of vegetation. More
What's That!
What's That! - Articles Articles
Properly identifying the organism is the first step of integrated pest management (IPM). More
Purple Loosestrife in Pennsylvania
Purple Loosestrife in Pennsylvania - Articles Articles
Purple Loosestrife is an aggressive plant that is invading our wetlands and replacing valuable wetland plants; eliminating food and shelter for wildlife; and choking waterways. More
Weed Ecology, Biology, and Identification
Weed Ecology, Biology, and Identification - Articles Articles
Understanding weed ecology can help in designing management systems to minimize their impact. More
Purple Loosestrife
Purple Loosestrife - Videos Videos
Part 2, 6 minutes. More