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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Lambsquarters (Chenopodium album)
Management of Triazine-Resistant Pigweed and Lambsquarters - Articles Articles
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
Johnsongrass (Sorghum halepense)
Johnsongrass and Shattercane Control: An Integrated Approach - Articles 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
Wirestem Muhly Management in Agronomic Crops
Wirestem Muhly Management in Agronomic Crops - Articles 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
Waterhemp in soybeans
2016 Penn State Agronomy Herbicide Trial Report - Articles Articles
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
Horseweed in soybean
2015 Penn State Agronomy Herbicide Trial Report - Articles Articles
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
Quackgrass Management: An Integrated Approach
Quackgrass Management: An Integrated Approach - Articles 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
Pokeweed
Pokeweed - Videos Videos

Pokeweed

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

This video discusses Pokeweed biology and management in field crops. 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: 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
Ideas On Herbicide Resistance Shared At Regional Meeting Ideas On Herbicide Resistance Shared At Regional Meeting - News
A productive discussion was had in Lancaster on the challenges, successes, and needs going forward for managing herbicide resistant weeds in the mid-Atlantic. More
Weed Management in Turf
Weed Management in Turf - Articles Articles

Weed Management in Turf

Peter Landschoot, Ph.D.

Weeds are undesirable because they disrupt turf uniformity and compete with desirable grass species for moisture, light, and nutrients. More
Weed Management in Organic Cropping Systems
Weed Management in Organic Cropping Systems - Articles Articles
When managing weeds in organic systems, producers use many of the same techniques used in conventional systems, but they rely much more on nonchemical control strategies. More
Managing Weeds in CREP Grasslands
Managing Weeds in CREP Grasslands - Articles Articles

Managing Weeds in CREP Grasslands

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

It's time to think about managing those weedy plants in CREP before they set seed. More
Weed Management in CREP Grasslands
Weed Management in CREP Grasslands - Articles Articles

Weed Management in CREP Grasslands

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

This publication will discuss weed management options for Conservation Reserve Enhancement Program (CREP) grassland acres enrolled in Conservation Practices CP1, CP2, and CP10. More
Persistence of Herbicides in Soil
Persistence of Herbicides in Soil - Articles Articles

Persistence of Herbicides in Soil

William S. Curran, Ph.D.

While it is desirable for the chemicals to control weeds during the season of application, it is not desirable for them to persist and affect subsequent crop growth. More
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