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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Johnsongrass (Sorghum halepense)
Johnsongrass and Shattercane Control: An Integrated Approach - Articles Articles
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 (Muhlenbergia frondosa) is a perennial grass species that can be problematic in conservation tillage production systems throughout Pennsylvania and the Northeast. More
Quackgrass Management: An Integrated Approach
Quackgrass Management: An Integrated Approach - Articles Articles
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
Photo of horseweed taken in early November. Curran, Penn State
How Late Can I Control Weeds in the Fall? - Articles Articles
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
Introduction to Weeds and Herbicides
Introduction to Weeds and Herbicides - Articles Articles
Weeds are plants whose undesirable qualities outweigh their good points. 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
Pokeweed
Pokeweed - Videos Videos

Pokeweed

Dwight Lingenfelter

This video discusses Pokeweed biology and management in field crops. More
Managing Weeds in CREP Grasslands
Managing Weeds in CREP Grasslands - Articles Articles
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
This publication will discuss weed management options for Conservation Reserve Enhancement Program (CREP) grassland acres enrolled in Conservation Practices CP1, CP2, and CP10. More
Pigweed Seedling Identification
Pigweed Seedling Identification - Articles Articles

Pigweed Seedling Identification

Dwight Lingenfelter

This is the time of year to try to correctly identify and manage problematic pigweeds in your fields. More
Multiflora Rose Management in Grass Pastures (An Integrated Approach)
Multiflora Rose Management in Grass Pastures (An Integrated Approach) - Articles Articles
The weed multiflora rose (Rosa multiflora, Thunb.) is an increasing problem in Pennsylvania pastures and noncropland. It thrives on idle land, fencerows, and minimally maintained, hilly pastures. More
Integrated Approach- Management of Eastern Black Nightshade
Integrated Approach- Management of Eastern Black Nightshade - Articles Articles
Eastern black nightshade (Solanum ptycanthum Dun.), an annual broadleaf plant, is an increasing weed problem in northeastern field crop production. More
Images 1. Common ragweed. DiTomaso, J. UC-Davis, Bugwood.org.
Keep an Eye Out for the Ragweeds - Articles Articles
Members of the Aster family, particularly the ragweeds, are never good neighbors and it’s key to understand what your post treatment options are. More