See All Pest, Disease and Weed Identification

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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 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
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 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
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
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
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
Persistence of Herbicides in Soil
Persistence of Herbicides in Soil - Articles Articles
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
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
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
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