See All Pest, Disease and Weed Identification

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Spotted lanternfly on apple in Berks County, PA in October 2017. Photo: Erica Smyers, Penn State
Spotted Lanternfly on Grapes and Tree Fruit - Articles Articles

Spotted Lanternfly on Grapes and Tree Fruit

Julie Urban, Dave Biddinger, Ph.D., Ed Rajotte, Ph.D.

Biology, management and slowing the spread of the spotted lanternfly on grapes and tree fruit in the Mid-Atlantic Region. 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
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
Figure 1. Lodged corn seen from a distance.
Corn rootworms Suspected of Resistance to Bt Corn Varieties Discovered - Articles Articles
Western corn rootworms that developed resistance to some Bt corn varieties may now be a problem in PA. 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
Alfalfa Weevil
Alfalfa Weevil - Articles Articles

Alfalfa Weevil

John Tooker, Ph.D.

Alfalfa weevil is one of the two most-damaging insect pests of alfalfa in Pennsylvania (the other is potato leafhopper). It is an exotic species that likely evolved in Asia, but appears to have been introduced to the U.S. at least three times. More
Pigweed Seedling Identification
Pigweed Seedling Identification - Articles Articles

Pigweed Seedling Identification

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

This is the time of year to try to correctly identify and manage problematic pigweeds in your fields. More
Mourad Louadfel, Bugwood.org
Keep an Eye Out for Cereal Leaf Beetle - Articles Articles
Scout now for infestations of cereal leaf beetle in small grain fields. The larval stage feeds on the leaves and fields appear white if heavily infested. More
Six of One, Half Dozen of the Other: the Future of Weed Management?
Six of One, Half Dozen of the Other: the Future of Weed Management? - Articles Articles
Whether you grow cotton in the Delta of Mississippi, soybean in IN, or corn in PA, chances are good that there are herbicide resistant weeds near or on your farm. More
Assessing Soybean Fields for Insect Damage
Assessing Soybean Fields for Insect Damage - Articles Articles
This time of year (July) a suite of insect pest species are feeding upon soybean foliage. 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
Images 1. Common ragweed. DiTomaso, J. UC-Davis, Bugwood.org.
Keep an Eye Out for the Ragweeds - Articles Articles

Keep an Eye Out for the Ragweeds

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

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
Invasive Pigweeds: Palmer Amaranth and Waterhemp
Invasive Pigweeds: Palmer Amaranth and Waterhemp - Articles Articles

Invasive Pigweeds: Palmer Amaranth and Waterhemp

William S. Curran, Ph.D., Annie Klodd

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
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
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
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
Integrated Approach- Management of Eastern Black Nightshade
Integrated Approach- Management of Eastern Black Nightshade - Articles Articles

Integrated Approach- Management of Eastern Black Nightshade

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

Eastern black nightshade (Solanum ptycanthum Dun.), an annual broadleaf plant, is an increasing weed problem in northeastern field crop production. 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)

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

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