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.
"Don't let weeds grow in the greenhouse." Growers know it, customers sense it, and Extension educators preach it. But is zero tolerance for weeds attainable?
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.
When driving, we often see flowering weeds in fields or roadsides. Casual walks along a country road may cause us to stop and check out the weeds of summer.
Pineappleweed can be either a summer or winter annual.
More Articles ByTanner Delvalle, Peter Landschoot, Ph.D., Jeff Borger, M.S.
Seedbed establishment for fine turf can be extremely difficult, and is often considered an art form.
Shepherd's purse (Capsella bursa-pastoris) is a winter annual.
Smooth groundcherry (Physalis longifolia var. subglabrata) is a perennial plant.
Purslane (Portulaca oleracea) is a summer annual that forms low growing mats of succulent stems and leaves.
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.
The juniper scale, native to Europe, is now found throughout the United States. This key pest attacks junipers, cypresses, falsecypress, and incense cedar in landscapes and nurseries.
Catchweed bedstraw (Galium aparine) is an annual that can form dense mats of vegetation.
Properly identifying the organism is the first step of integrated pest management (IPM).
Purple Loosestrife is an aggressive plant that is invading our wetlands and replacing valuable wetland plants; eliminating food and shelter for wildlife; and choking waterways.
Understanding weed ecology can help in designing management systems to minimize their impact.