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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Tree of heaven leaves. Credit: Bigstock
Tree-of-Heaven - Articles Articles

Tree-of-Heaven

David R. Jackson

Tree-of-heaven (Ailanthus altissima) also known as ailanthus, Chinese sumac, and stinking sumac is a rapidly growing, deciduous tree native to a region extending from China south to Australia. Spotted Lanternfly, an invasive pest, is particularly attracted to Tree-of-heaven. More
Jimsonweed, Datura stramonium. Photo: Jan Samanek, Phytosanitary Administration, Bugwood.org
Toxic Weed in the Landscape: Jimsonweed - News News
Jimsonweed is an annual plant that is poisonous to animals and humans. More
Weed Life Cycles
Weed Life Cycles - Videos Videos

Weed Life Cycles

Bill Riden

7:46

Learn the life cycle of weeds. More
Managing Invasive Plants
Managing Invasive Plants - Workshops Workshops
This workshop will provide participants with the knowledge and skills to properly identify invasive plants and develop strategies for treatment and control. More
Georgia Department of Ag., Bugwood.org
It's Time to Plant! - Workshops Workshops
Come join Penn State Master Gardeners of Carbon County as they present their spring workshop "It's Time to Plant." More
Rights of Way and Integrated Vegetation Management
Rights of Way and Integrated Vegetation Management - Workshops Workshops
This seminar will provide insight and beneficial information for vegetation managers. More
Landscape IPM Seminar
Landscape IPM Seminar - Workshops Workshops
This seminar provides valuable research-based information along with re-certification and continuing education credits. More
Christmas Tree Growers Meeting & Trade Show
Christmas Tree Growers Meeting & Trade Show - Workshops Workshops
Christmas tree growers are invited to join us for a day of educational presentations, pesticide updates, and new product information. More
Christmas Tree, Ornamental & Turf Pest Management School
Christmas Tree, Ornamental & Turf Pest Management School - Workshops Workshops
This school will provide educational information and pesticide license credits for working with Christmas trees, landscapes, and turfgrass. More
Turf and Ornamental Conference of Northwest Pennsylvania
Turf and Ornamental Conference of Northwest Pennsylvania - Conferences Conferences
World renowned speakers, and over 30 commercial exhibitors, will be present for this day-long Green Industry extravaganza. More
Harrington Seed Destructor
Weed Management Field Day - Workshops Workshops
USDA-ARS Beltsville Agricultural Research Center to host a Integrated Weed Management Field Day. More
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
Noxious Weed - Catsear
Noxious Weed - Catsear - Articles 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
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
Weed Identification Walk
Weed Identification Walk - Workshops Workshops
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
Marestail (horseweed) in Rock Springs, PA (Annie Klodd)
Managing Herbicide Resistant Marestail (horseweed) - Videos Videos
Best management practices for resistant marestail (horseweed) More
Herbicide Resistant Marestail (horseweed) in Pennsylvania
Herbicide Resistant Marestail (horseweed) in Pennsylvania - Videos Videos
Marestail (horseweed) resistant to glyphosate and Group 2 herbicides is present in PA and presents management challenges. More
Harrington Seed Destructor
Harrington Seed Destructor - Videos 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
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
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
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