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.
Best management practices for resistant marestail (horseweed)
Marestail (horseweed) resistant to glyphosate and Group 2 herbicides is present in PA and presents management challenges.
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.
Palmer amaranth and waterhemp have emerged for the season in Pennsylvania. It is important to scout for these invasive weeds now, and control them before they reach 4 inches tall.
By Emelie Swackhamer, Gregory Hoover
The best way to make an effective pesticide application is to observe pest development at the site through regular monitoring.
By Emelie Swackhamer, J. Robert Nuss, Larry Kuhns, Gregory Hoover
Inspecting your plants on a regular basis is essential to identifying and evaluating plant problems in their early stages.
A productive discussion was had in Lancaster on the challenges, successes, and needs going forward for managing herbicide resistant weeds in the mid-Atlantic.
By 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.
Thorough cleaning and knowledge of the combine’s prior use can prevent the introduction of new herbicide-resistant weeds to your fields.