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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Joseph LaForest, University of Georgia, Bugwood.org
Juniper Scale - Articles Articles
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. 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
Weed Ecology, Biology, and Identification
Weed Ecology, Biology, and Identification - Articles Articles
Understanding weed ecology can help in designing management systems to minimize their impact. More
Purple Loosestrife in Pennsylvania
Purple Loosestrife in Pennsylvania - Articles Articles
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. More
Purple Loosestrife
Purple Loosestrife - Videos Videos
Part 2, 6 minutes. More
Invasive Species
Invasive Species - Articles Articles
The United States is under constant threat of exotic species invading our shores. More
Introduction to Weeds: What are Weeds and Why do we Care?
Introduction to Weeds: What are Weeds and Why do we Care? - Articles Articles
No matter what definition is used, weeds are plants whose undesirable qualities outweigh their good points. More
Alton N. Sparks, Jr., University of Georgia, Bugwood.org
Integrated Pest Management (IPM) Tactics - Articles Articles
The goal of using multiple tactics or "many small hammers" is to effectively suppress pests below injurious levels and avoiding outbreaks. More
Greenhouse IPM
Greenhouse IPM - Articles Articles
PA IPM has devoted a great deal of effort to designing IPM solutions for greenhouse production, particularly biological control. More
Activity - Weeds, Weeds Everywhere!
Activity - Weeds, Weeds Everywhere! - Articles Articles
Skills: Observation, measuring, identifying, categorizing. More
Pokeweed
Pokeweed - Videos Videos

Pokeweed

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

This video discusses Pokeweed biology and management in field crops. More
Purple Loosestrife – A Noxious Weed
Purple Loosestrife – A Noxious Weed - Articles Articles
Recently, some folks pulled into the local nursery, asking about the pretty pink flowering plants that were blooming along the fields and roadsides. More
Photo of horseweed taken in early November. Curran, Penn State
How Late Can I Control Weeds in the Fall? - Articles Articles

How Late Can I Control Weeds in the Fall?

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

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
Introduction to Weeds and Herbicides
Introduction to Weeds and Herbicides - Articles Articles
Weeds are plants whose undesirable qualities outweigh their good points. More
Herbicide Resistant Pigweed 3: Management in Horticultural Crops
Herbicide Resistant Pigweed 3: Management in Horticultural Crops - Videos Videos
This video covers the best management practices for Palmer Amaranth and waterhemp in horticultural cropping systems. More