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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Introduction to Weeds and Herbicides
Introduction to Weeds and Herbicides - Articles Articles
Weeds are plants whose undesirable qualities outweigh their good points. More
Herbicide Resistance Pigweed 1: Identification
Herbicide Resistance Pigweed 1: Identification - Videos Videos
Key points to ID Palmer Amaranth and waterhemp, and information about their biology that is important for effective management. More
Herbicide Resistance Pigweed 5: Prevention and Disposal
Herbicide Resistance Pigweed 5: Prevention and Disposal - Videos Videos
How to best prevent the entry of herbicide resistant Palmer Amaranth and waterhemp to new fields, and how to properly dispose of plants so that they do not cause larger infestations. More
Herbicide Resistant Pigweed 2: Management in Conventional Row Crops
Herbicide Resistant Pigweed 2: Management in Conventional Row Crops - Videos Videos
This video covers the best management practices for Palmer Amaranth and waterhemp in conventional row crops. More
Herbicide Resistant Pigweed 4: Management in Organic Systems
Herbicide Resistant Pigweed 4: Management in Organic Systems - Videos Videos
This video covers the best management practices for Palmer Amaranth and waterhemp in organic cropping systems. More
Herbicide Resistant Pigweed 3: Management in Horticultural Crops
Herbicide Resistant Pigweed 3: Management in Horticultural Crops - Videos Videos
This video covers the best management practices for Palmer Amaranth and waterhemp in horticultural cropping systems. 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
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
Pigweed Seedling Identification
Pigweed Seedling Identification - Articles Articles

Pigweed Seedling Identification

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

This is the time of year to try to correctly identify and manage problematic pigweeds in your fields. More
Invasive Pigweeds: Palmer Amaranth and Waterhemp
Invasive Pigweeds: Palmer Amaranth and Waterhemp - Articles Articles
Palmer amaranth is a species of pigweed that was recently introduced into PA and has been positively identified on more than 30 sites across the state. More
Multiflora Rose Management in Grass Pastures (An Integrated Approach)
Multiflora Rose Management in Grass Pastures (An Integrated Approach) - Articles Articles

Multiflora Rose Management in Grass Pastures (An Integrated Approach)

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

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
Multiflora Rose
Multiflora Rose - Articles Articles

Multiflora Rose

David R. Jackson

Multiflora rose is a noxious, non-native shrub considered an invasive weed because of its aggressive growth habit that excludes native plants. More