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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
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
Septoria leaf spot on Rudbeckia (Photo by S. Guiser)
Bud Break: A Key Time for Controlling Plant Diseases - Articles Articles
Not only do you and I look forward to Spring weather, fungi, bacteria, phytoplasmas and other plant pathogens also gear up for the season. More
Fire blighted flowers. Photo: Gary Moorman
Fire Blight in Ornamentals - Articles Articles

Fire Blight in Ornamentals

Gary W. Moorman, Ph.D.

Fire blight is a disease caused by the bacterium Erwinia amylovora. More
Fern Diseases
Fern Diseases - Articles Articles

Fern Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Fern diseases. More
Walnut Anthracnose
Walnut Anthracnose - Articles Articles

Walnut Anthracnose

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Walnut Anthracnose disease. More
Willow Diseases
Willow Diseases - Articles Articles

Willow Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Willow diseases. More
Astilbe Diseases
Astilbe Diseases - Articles Articles

Astilbe Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Astilbe diseases. More
Coreopsis Diseases
Coreopsis Diseases - Articles Articles

Coreopsis Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Coreopsis diseases. More
Viola Diseases
Viola Diseases - Articles Articles

Viola Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Viola diseases. More
Hosta Diseases
Hosta Diseases - Articles Articles

Hosta Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Hosta diseases. More
Norfolk Island Pine Diseases
Norfolk Island Pine Diseases - Articles Articles

Norfolk Island Pine Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Norfolk Island Pine diseases. More
Pansy Diseases
Pansy Diseases - Articles Articles

Pansy Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Pansy diseases. More
Boston Ivy (Parthenocissus) Disease
Boston Ivy (Parthenocissus) Disease - Articles Articles

Boston Ivy (Parthenocissus) Disease

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Boston Ivy (Parthenocissus) diseases. More
Catalpa Diseases
Catalpa Diseases - Articles Articles

Catalpa Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Catalpa diseases. More
Ornamental Cherry Diseases
Ornamental Cherry Diseases - Articles Articles

Ornamental Cherry Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Cherry diseases. More
Chestnut Diseases
Chestnut Diseases - Articles Articles

Chestnut Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Chestnut diseases. More
Cotoneaster Diseases
Cotoneaster Diseases - Articles Articles

Cotoneaster Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Cotoneaster diseases. More
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