Weed Identification and Control
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.
Videos Weed Life Cycles
Bill Riden
7:46
Learn the life cycle of weeds. More
Articles Management of Triazine-Resistant Pigweed and Lambsquarters
William S. Curran, Ph.D.
Since the discovery of triazine resistance in the United States occurred in the late 1960s, more than 50 species of weeds have developed weed resistance problems. More
Articles Johnsongrass and Shattercane Control: An Integrated Approach
Dwight Lingenfelter, William S. Curran, Ph.D.
Johnsongrass and shattercane are closely related grass weeds that are troublesome and persistent in row crops, where they reduce yield and quality. More
Articles Wirestem Muhly Management in Agronomic Crops
Dwight Lingenfelter, William S. Curran, Ph.D.
Wirestem muhly (Muhlenbergia frondosa) is a perennial grass species that can be problematic in conservation tillage production systems throughout Pennsylvania and the Northeast. More
Articles Catsear (Hypochaeris radicata or Hypochoeris radicata), also known as flatweed, cat's ear or false dandelion, is a perennial, low-lying herb often found in lawn. More
Articles 2016 Penn State Agronomy Herbicide Trial Report
William S. Curran, Ph.D.
This weed field trials report is a summary of the 2016 herbicide trials conducted in corn soybean, and other field crops by the Department of Plant Science at Penn State. More
Articles 2015 Penn State Agronomy Herbicide Trial Report
William S. Curran, Ph.D.
This weed field trials report is a summary of the 2015 herbicide trials conducted in corn soybean, and other field crops by the Department of Plant Science at Penn State. More
Articles Quackgrass Management: An Integrated Approach
Dwight Lingenfelter, William S. Curran, Ph.D.
Quackgrass is a widespread, persistent, cool-season, grassy weed found in Pennsylvania row and forage crops. This competitive perennial grass can reduce crop yields up to 95 percent. More
Workshops Weed Identification Walk
Multiple Options Available
$15.00
Join us for a hands-on, interactive session to learn about identifying and managing a variety of broadleaf and grassy weeds in both turf and landscape situations. More
Videos Managing Herbicide Resistant Marestail (horseweed)
Annie Klodd
6:41
Best management practices for resistant marestail (horseweed) More
Videos Herbicide Resistant Marestail (horseweed) in Pennsylvania
Annie Klodd
4:07
Marestail (horseweed) resistant to glyphosate and Group 2 herbicides is present in PA and presents management challenges. More
Articles Zero Tolerance for Weeds in the Greenhouse
Lee Stivers
"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
Videos Harrington Seed Destructor
Annie Klodd
2:44
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
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
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
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
Articles What's That!
Ed Rajotte, Ph.D.
Properly identifying the organism is the first step of integrated pest management (IPM). More
Articles Weed Ecology, Biology, and Identification
Dwight Lingenfelter
Understanding weed ecology can help in designing management systems to minimize their impact. More
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
Videos Part 2, 6 minutes. More
Articles The United States is under constant threat of exotic species invading our shores. More
Articles No matter what definition is used, weeds are plants whose undesirable qualities outweigh their good points. More
Articles The goal of using multiple tactics or "many small hammers" is to effectively suppress pests below injurious levels and avoiding outbreaks. More
Articles PA IPM has devoted a great deal of effort to designing IPM solutions for greenhouse production, particularly biological control. More
Articles Skills: Observation, measuring, identifying, categorizing. More