Weed Identification and Control

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.

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Japanese and Giant Knotweed
Japanese and Giant Knotweed - Articles Articles

Japanese and Giant Knotweed

David R. Jackson

Japanese knotweed (Polygonium cuspidatum) and Giant knotweed (Polygonum sachalinensis) are two invasive, exotic weeds found throughout much of the United States and Canada. More
Japanese Barberry
Japanese Barberry - Articles Articles

Japanese Barberry

David R. Jackson

Japanese barberry (Berberis thunbergii) was introduced from Japan around 1875. It now ranges from Nova Scotia south to North Carolina, and westward to Montana. More
Oriental Bittersweet
Oriental Bittersweet - Articles Articles
Oriental bittersweet is a non-native woody, perennial vine that covers and kills native plants by blocking sunlight, weighing the plants down, and girdling stems and trunks. More
Mile-a-minute
Mile-a-minute - Articles Articles
Mile-a-minute is an invasive, noxious weed from eastern Asia that is rapidly colonizing non-crop areas in Pennsylvania and surrounding states. More
Multiflora Rose
Multiflora Rose - Articles Articles
Multiflora rose is a noxious, non-native shrub considered an invasive weed because of its aggressive growth habit that excludes native plants. More
Autumn Olive
Autumn Olive - Articles Articles

Autumn Olive

David R. Jackson

Autumn olive (Elaeagnus umbellata) is an exotic deciduous shrub and has been listed as a noxious weed throughout much of its range. More
Bush Honeysuckles
Bush Honeysuckles - Articles Articles
Exotic bush honeysuckles (Lonicera spp.) are upright deciduous shrubs, which out compete many native plant species for natural habitat. More
Invasive Weeds - Wild Grape
Invasive Weeds - Wild Grape - Articles Articles
Wild grape (Vitis spp.) is a native vine found throughout Pennsylvania. There are various species of wild grape occurring in a variety of habitats. More
Photo: Chris Evans, Illinois Wildlife Action Plan, Bugwood.org, catchweed bedstraw, Galium aparine
Catchweed Bedstraw - Articles Articles

Catchweed Bedstraw

Tim Abbey

Catchweed bedstraw (Galium aparine) is an annual that can form dense mats of vegetation. More
What's That!
What's That! - Articles Articles

What's That!

Ed Rajotte, Ph.D.

Properly identifying the organism is the first step of integrated pest management (IPM). More
Herbicide Summary - Escort XP Herbicide Summary - Escort XP - Articles

Herbicide Summary - Escort XP

David R. Jackson

Controls many annual and perennial broadleaf weeds and woody plants, especially effective on kudzu vine and multiflora rose; used in conifer site preparation. More
Herbicide Summary - Clean Slate Herbicide Summary - Clean Slate - Articles
Provides postemergence control of most broadleaf weeds including thistle and kudzu vine; applied as either a site preparation or tree release application for both conifer and hardwood planting sites More
Herbicide Summary - Element 3A Herbicide Summary - Element 3A - Articles

Herbicide Summary - Element 3A

David R. Jackson

For controlling woody plants, broadleaf weeds, and vines; broadcast treatments for site preparation and release of spruce, fir, red pine, and white pine from competing hardwoods. More
Herbicide Summary - Forestry Garlon XRT Herbicide Summary - Forestry Garlon XRT - Articles
For controlling woody plants as well as annual and perennial broadleaf weeds; broadcast treatments for site preparation and release of conifers; used to control cut stump re-sprouting. More
Herbicide Summary - Trooper 22K Herbicide Summary - Trooper 22K - Articles
Broadcast or spot treatments used to control noxious, invasive, or other annual and perennial broadleaf weeds, woody plants, and vines; primarily for conifer site preparation. More
Herbicide Summary - Refuge Herbicide Summary - Refuge - Articles

Herbicide Summary - Refuge

David R. Jackson

Controls annual and perennial weeds, grasses, vines, and woody plants; broadcast and spot treatments for hardwood brush and fern control or for site preparation. More
Herbicide Summary - Relegate RTU Herbicide Summary - Relegate RTU - Articles
Use any time of year to control individual stems up to 6 inches in diameter and cut stump resprouting; stumps can be treated up to one month following cutting. More
Herbicide Summary - Rodeo Herbicide Summary - Rodeo - Articles

Herbicide Summary - Rodeo

David R. Jackson

Controls annual and perennial weeds, grasses, vines, and woody plants; broadcast and spot treatments for hardwood brush and fern control; directed spray and broadcast treatments for conifer release. More
Herbicide Summary - Trooper 101 Mixture Herbicide Summary - Trooper 101 Mixture - Articles
Used for control of most annual and perennial broadleaf weeds, woody plants, and vines on forest planting sites. More
Herbicide Summary - VelparL Herbicide Summary - VelparL - Articles

Herbicide Summary - VelparL

David R. Jackson

Used to control most annual, biennial, and perennial weeds and woody vegetation for conifer site preparation and in the establishment of yellow poplar plantations. More
Herbicide Summary - Velossa Herbicide Summary - Velossa - Articles

Herbicide Summary - Velossa

David R. Jackson

Used to control most annual, biennial, and perennial weeds and woody vegetation for conifer site preparation and release and in the establishment of yellow poplar plantations. More
Herbicide Summary - Element 4 Herbicide Summary - Element 4 - Articles

Herbicide Summary - Element 4

David R. Jackson

For controlling unwanted woody plants, including mountain laurel, as well as annual and perennial broadleaf weeds; use for site preparation and to control cut stump re-sprouting of individual stems. More
Herbicide Summary - Pathfinder II Herbicide Summary - Pathfinder II - Articles
Used any time of year to control individual stems and cut stump re-sprouting; stumps can be treated up to one month following cutting. More
Herbicide Summary - Transline Herbicide Summary - Transline - Articles

Herbicide Summary - Transline

David R. Jackson

Provides post-emergence control of most broadleaf weeds including thistle and kudzu vine; applied as either a site preparation or tree release application for both conifers and hardwoods. More
Monitor Pests and Keep Records
Monitor Pests and Keep Records - Articles Articles

Monitor Pests and Keep Records

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. More