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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Photo: Mark Czarnota, University of Georgia, Bugwood.org
Mulberry Weed - Articles Articles

Mulberry Weed

Tim Abbey

A weed that has been spreading in recent years in the nursery and landscape trade is mulberry weed. More
Photo: Karan A. Rawlins, University of Georgia, Bugwood.org
Black Medic - Articles Articles

Black Medic

Tim Abbey

Black medic (Medicago lupulina) is a spreading, low growing summer annual. More
Weed Management in Turf
Weed Management in Turf - Articles Articles

Weed Management in Turf

Peter Landschoot, Ph.D.

Weeds are undesirable because they disrupt turf uniformity and compete with desirable grass species for moisture, light, and nutrients. More
Options for Chemical Control of Moss in Putting Greens
Options for Chemical Control of Moss in Putting Greens - Articles Articles

Options for Chemical Control of Moss in Putting Greens

Peter Landschoot, Ph.D., Joshua Cook

Silvery thread moss (Bryum argenteum) in putting greens is becoming an all-too-common occurrence on Pennsylvania golf courses. More
Penn State Department of Plant Pathology & Environmental Microbiology Archives, Penn State, Bugwood.org
Diagnosing Turfgrass Problems - Articles Articles
The cause of turfgrass damage is often difficult to determine if considerable time has elapsed between damage and diagnosis. More
Photo: Tim Abbey
Common Pokeweed Identification and Management - Articles Articles
Pokeweed can be a weed in landscape beds and nurseries. More
Photo: Loke T. Kok, Virginia Polytechnic Institute and State University, Bugwood.org, bull thistle, Cirsium vulgare
Bull Thistle Identification and Management - Articles Articles
Bull thistle (Cirsium vulgare) is a biennial that true to its name, has notable spines. This plant is much different than Canada thistle. More
Tree of heaven leaves. Credit: Bigstock
Tree-of-Heaven - Articles Articles

Tree-of-Heaven

David R. Jackson

Tree-of-heaven (Ailanthus altissima) also known as ailanthus, Chinese sumac, and stinking sumac is a rapidly growing, deciduous tree native to a region extending from China south to Australia. Spotted Lanternfly, an invasive pest, is particularly attracted to Tree-of-heaven. 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
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
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
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
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
What Makes a Good Plant or Insect Sample?
What Makes a Good Plant or Insect Sample? - Articles Articles
Advice for collecting a good plant or insect sample for identification. More
Weed Control in Home Fruit Plantings
Weed Control in Home Fruit Plantings - Articles Articles

Weed Control in Home Fruit Plantings

Robert Crassweller, Ph.D.

Weed control can be accomplished chemically or mechanically. Depending on the situation, each method has its advantages and disadvantages. More
Types of Weeds
Types of Weeds - Articles Articles
To adequately control weeds in the small-scale orchard, you should learn proper weed identification. More
Pests and Pesticides in Home Fruit Plantings
Pests and Pesticides in Home Fruit Plantings - Articles Articles
Can fruit crops be grown in the home garden without pesticides? The answer is yes, but fruit quantity and quality may decrease. More
Pesticide Toxicity Pesticide Toxicity - Articles
Because pesticides are toxic, they are also potentially hazardous to humans and animals. More
Pest Management in Grapes in Home Fruit Plantings
Pest Management in Grapes in Home Fruit Plantings - Articles Articles
Herbicides currently registered for use in commercial vineyards are not recommended for home gardeners. More
Fern-dominated forest understories interfere with forest regeneration and provide poor habitat for wildlife. Photo Credit: David Jackson
Controlling Understory Fern Competition for Regeneration Success - Articles Articles
Dense understories of hay-scented, New York, and bracken fern can interfere with the regeneration of hardwood forests, threatening their sustainability. 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
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
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

Managing Weeds in CREP Grasslands

Dwight Lingenfelter, William S. Curran, Ph.D.

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

Weed Management in CREP Grasslands

Dwight Lingenfelter, William S. Curran, Ph.D.

This publication will discuss weed management options for Conservation Reserve Enhancement Program (CREP) grassland acres enrolled in Conservation Practices CP1, CP2, and CP10. More