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.
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 and shattercane are closely related grass weeds that are troublesome and persistent in row crops, where they reduce yield and quality. More
Wirestem muhly (Muhlenbergia frondosa) is a perennial grass species that can be problematic in conservation tillage production systems throughout Pennsylvania and the Northeast. More
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
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 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
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
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
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
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
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
This publication will discuss weed management options for Conservation Reserve Enhancement Program (CREP) grassland acres enrolled in Conservation Practices CP1, CP2, and CP10. More
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
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
Eastern black nightshade (Solanum ptycanthum Dun.), an annual broadleaf plant, is an increasing weed problem in northeastern field crop production. More
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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