Weeds & Parasitic Plants:
Weeds from A to Z
Weed Identification
Pages for Specific Weeds
Parasitic Plants from A to Z
Weed Science Societies & Organizations


Australia's Feral Plants, Biological Science Museum, Macquarie University, Sydney. A "feral" could have the same definition as a weed, that is, an organism out of place. Available Information: What changes have we caused? - Conditions for weeds, Weed Characteristics - What makes a "good" weed?, and Some common urban weeds.

Berries and Grapes: Weed Management Guidelines, The Northwest Berry & Grape InfoNet is produced by the North Willamette Research and Extension Center, Oregon State University Extension Service. First select a fruit crop: Blackberry, Blueberry, Cranberry, Currant, Grape, Gooseberry, Raspberry, Strawberry. For each fruit detailed information on weed management is available. Also on this server: Links to weed Images.

Biocontrol of Weeds, Cooperative Agricultural Pest Survey (CAPS), Department of Plant, Soil and Insect Sciences, College of Agriculture, University of Wyoming, USA. Available information on Weeds: Historical Data, Weed Biocontrol Statistics, detailed Biocontrol documents for selected important weeds and noxious weeds (information for Wyoming and links to other pages). For the selected weeds you will find pictures, the detailed biocontrol information (including the biocontrol organism).

Biological Control of Weeds in Europe - COST 816, European Cooperation in Science and Technology (COST). Use of natural enemies and pathogens to reduce the population density of a target species below its economic injury level. Working Groups for: Senecio, Amaranthus, Convolvulus, and Chenopodium. Available Information: Summary of Objectives, present status and recent achievements, working organisations and working groups, National delegates, and Meetings.

Citrus Weed Management, by Tucker, D. P. H. , and Singh, M. From the Index: Methods of Weed Control, Weed Control Programs, influence on the environment, environmental considerations, reducing herbicide movement in the soil.

Colorado Weed Management Association (CWMA): An organization dedicated to preserving Colorado's natural resources. Includes: Weed Watch, the CWMA Newsletter, calendar of events. Weeds mandated by Law to Control, Noxious Weeds, Links to other related resources. Photos and short description of 30 troublesome weeds.

Common Weeds of No-Till Cropping Systems, by D. Childs, Department of Botany and Plant Pathology, Purdue University. Select a weed from the index and get the following information: Common & Scientific Name, Life Cycle, Control, and high resolution pictures of the weed.

Corn Management Information: Weeds, Agronomy Department, Purdue University, West Lafayette, USA. Subsection of Chapter 2 of "The Corn Grower's Guide Book": Select Weeds from the menu on the left. References from Indiana and Michigan. Compilation of documents and links concerning weed management in corn. Guidelines, control in no-tillage systems, herbicides, documents on specific weeds.

CRC for Weed Management Systems, Waite Campus, the University of Adelaide, Australia. Research areas: biological control, herbicide technology, herbicide resistance, vegetation management, bioherbicides, population and economic modelling, decision support, weed ecology and population dynamics. The Center is divided into five programs. The center is in close cooperation with other societies and organizations. Some Links and a search page are available.

Environmental Weeds Home Page, maintained by J. P. Pigott, Department of Conservation and Land Management (CALM), Australia. This page provides links to internet sites on environmental weeds (or invasives). Provides regularly updated news on relevant weed events in Australia. Also links to general weeds pages, divided into regions (Western Australia, Australia, Overseas).

Environmental Weeds in Australia, Biodiversity Group, Environment Australia Online, Canberra, Australia. After a short introduction you will find information on how environmental weeds spread and florish, control of urban bushland weeds, effects of environmental weeds on natural environments, weeds causing serious concern, control, bushland weeds and some more.

Federal Interagency Committee for the Management of Noxious and Exotic Weeds (FICMNEW)

Field Crops Weeds 1999 Pest Management Guide produced by Virginia Cooperative Extension and Virginia Polytechnic Institute and State University. Select a crop from the menu and get detailed information. Crop Index: Grain Crops, soybeans, Forages, Tobacco, Peanuts and Cotton. Based on the 1999 Pest Management Guide for Field Crops - Chapter 5 "Weeds". Very well structured server with highly useful information.

Florida Weeds, Authors: D.W. Hall & V.V. Vandiver, provided by the Florida Agricultural Information Retrieval System (FAIRS). Topics: Authors, Introduction, illustrated glossary, scientific and common names of weeds. This publication is designed as an aid to the identification of weeds found in Florida. To get information on a weed select scientific or common names and browse through the document or use your browser's find function. You will get a classification, informatzion on the seedling and mature plants (incuding images), history, habitat and biology for each weed.

Hawaiian Alien Plant Studies, University of Hawaii, Department of Botany. Impact of Alien Plants on Hawai‘i's Native Biota (report with very detailed information), Biological Control of Miconia calvescens, Pest Plants of Hawaiian Native Ecosystems.

Impact of Drought on Weed Management. Prepared by S. M. Brown, D. A. Worsham. This publication has been issued in print by the North Carolina Cooperative Extension Service as publication number AG-519-7 (December 1994).

International Survey of Herbicide-Resistant Weeds, compiled by I. Heap, Corvallis, USA, funded by WSSA and HRAC. If you are searching for herbicide-resistant weeds than this site is you place. You can select databses for weeds by country or state in USA and get information on species, first year, herbicide and more. Or choose from different menus to get more detailed information on a single weed or a single county. Also available is a huge collection of photos including different stages of a weed. There is much more available on this site like summary graphs, list of resistant weeds, Register herbicide resistant weeds, herbicide classification by their site of action, herbicide resistance working groups, links... The best resource on the web for information on herbicde resistant weeds. The information service is very well organized, the use of tables and figures makes it easy to find the requested information. Makes it a TIP in this section.

Invasive Plants of Canada (IPCAN) Project, maintained by E. Haber, National Botanical Services, Ottawa, Canada. IPCAN grew out of an initiative in 1991 by the Habitat Conservation Divison, Canadian Wildlife Service (CWS) to compile information on invasive exotic plants of wetland and upland habitats. Available: Fact sheets (including field recognition, habitat, history, biology, impact, control, images), Reviews on on Rush Skeletonweed and Scotch Broom, Exotic Pest Plants Element Stewardship Abstracts (reports summarizing various aspects), impact of invasive plants, references, reports, plant alerts, a guide to monitoring exotic pest plants and more

IOBC/NRS Biological Control of Weeds Working Group, International Organization for Biological Control (IOBC), Neartic Regional Section (NRS). Available Information: Members, Announcements, Current Projects, IOBC/NRS Application, related Links.

Iowa State Weed Science, Department of Agronomy & Iowa State University Extension, Iowa State University, Ames. Full range of information from weed resources, quick links, news articles and more. You will find weed identification, Iowa weed law, herbicide manual or the science archive. The site is very easy to navigate and new articles appear on the starting screen.

Methods of Weed Control, University of Florida. From the Index: Cultivation, Mowing, Chemical Mowing, Chemical Control, Biological Control, allelopathy in Citrus Weed Control.

MU Weed Science, Department of Agronomy, Plant Sciences Unit, College of Agriculture, Food and Natural Resources, University of Missouri-Columbia (MU). Here you will find the weed science news and notes from the university. This are many documents on various topics like 'Postemergence Weed Control in Soybean', 'MU's Weed Identification Program' or 'Who are the Early Risers in the World of Weeds?'. Further available: personnel, herbicide injury, weed identification, graduate information, other sites and more.

Noxious Weeds Home Page, United States Department of Agriculture (USDA), Animal & PLant Health Inspection Service (APHIS). Available Information: Background, noxious weed information (current authority, policies, fact sheest, publications, risk assesment...), links to other related websites, links to Plant Protection & Quarantine, APHIS home and a guided tour.

Ontario Noxious Weeds, maintained by Ontario Vegetation Management Association (OVMA). Provincial and Regional Noxious Weeds Information listed by common and scientific name. The morphological descriptions are accompanied by pictures.

Pest/Biocontrol Information, maintained by by Cooperative Agriculture Pest Survey (CAPS) & National Agricultural Pest Information System (NAPIS). This website provides detailed information on various weeds. You will find this information in the following sections. (1) Biological Control Programs (e. g. knapweed, loosestife), (2)Federal Noxious Weeds (Small Broomrape (Orobanche minor, Tropical Soda Apple (Solanum viarum, Witchweed Striga asiatica) , (3) Other Weed Information.

Photo Herbarium, maintained by the Weed Science Society of America (WSSA) and University of Illinois. This photo herbarium contains pictures of many common plants that are known to infest North America. Weeds are listed by common names. Further available herbicide injury and videos. These videos (in avi-format) are concerning herbicide reactions on plants including postemergence, preemergence and preplant applications. The videos were taken at the Crop Science Department, Oregon State University. This is an excellent way to demonstrate herbicide effects on plants.

Physical Weed Control is a working group for the development of physical weed control and its implementation in sustainable agriculture. It is supported by the European Weed Research Society (EWRS). General Information about EWRS and this working group, publications, workshops, newsletter, people. Working group information: about the group, newsletter, workshop (including abstracts), references, glossary and more. The glossary is multilingual and includes images.

TNC Wildland Weeds Management & Research Program (WWMR), The Nature Conservancy (TNC), located at the University of California, Davis, California, USA. Available Information: About WWMR, Element Stewardship Abstracts (ESA), Worst Species, Links, Graphics, feedback. In ESA you get detailed information on many weeds including description, habitat, biology & ecology, threats, biological monitoring, research needs, management and references.

Turfgrass Weeds, The National Park Service Integrated Pest Management Manual.

Visualizing Herbicide Activity in Plant Leaves, B. Wade (Univ. of Illinois), J. Fenton (National Center for Supercomputer Applications), L. Wax (USDA-ARS & Univ. of Illinois). The Online version of a paper, content: abstract, introduction, materials & methods, results & discussion, references. This Online paper comes with videos of herbicide actions (Triazines, Atrazine, Metribuzin). You will need a MPEG-player, a download side and instruction is available on that website.

Weed Control Guide: Principles, Herbicides, Control of Weeds in different Crops. The Pages are maintained by the Florida Agricultural Information Retrieval System (FAIRS)

Weed Control Notes, Saskatchewan Agriculture and Food (SAF), Government of Saskatchewan, Canada. The Weed Identification Series covers more than 40 (noxious) weeds. Available information includes beside pictures other names, habitat, origin, description and control practices.

Weed Control Section of the Maryland Department of Agriculture. The Weed Control Section enforces the Maryland Weed Control Law and assists farmers or landowners in the battle against the designated noxious weeds Johnsongrass, shattercane and thistles. Available: Weed Control, Annual Reports.

Weed Control Strategies, Chapter 5 of the Pacific Northwest Conservation Tillage Handbook. Extension publication from the universities of Idaho, Oregon and Washington. The chapter is divided into several documents covering different topics. You will find articles on Russian Thistle Management, Downy Brome Control, Herbicide Effectiveness and others. The single documents include graphics and tables.

Weed Ecology Group at IACR, Crop and Disease Management Department,Rothamsted, UK. Programme Description: Biology, ecology, genetics and control of weeds in arable agriculture, including the study of herbicide resistance. Available Information: General programme description, individual projects, OASIS appraisal, and links.

Weed Feeders, Biological Control of Weeds by Weeden, Shelton & Hoffmann, Cornell University. Table of Contents include information about control of: Aligatorweed, Leafy Spurge, Knapweed, Purple Loosestrife. Also available: Glossary, Questionaire, Index.

The Weed Hall of Shame, Bureau of Land Management, Environmental Education Homepage. Learn more about America's Most Wanted Weeds: Purple Loosestrife, Yellow Starthistle, Medusa Head Rye, Musk Thistle, Leafy Spurge, Spotted Knapweed, Scotch Thistle, Dalmatian Toadflax, Kudzu.

Weed Images and Descriptions, Rutgers Cooperative Extension, New Jersey Agricultural Experiment Station. Alphabetic list of weeds. Excellent photos with a brief description.

Weed Index, maintained by Alberta Agriculture, Food and Rural Development. After selecting a weed you get information on: Life cycle, emergence, Flowers, Reproduction, Competition, Management Strategies, Control Mechanisms, and Chemical Control (Pesticide Selector Chart).

Weed Information, Weed Science Society of America (WSSA). Available: (1) Noxious Weeds, a list of links to documents, (2) Plant Names, access to the WSSA Composite List of Weeds and (3) Herbicide Resistance (including a link to the Herbicide Resistance Action Committee)

Weed Killers by the Glass. A citizens tap water monitoring project in 29 Cities. By: B. Cohen, R. Wiles, E. Bondoc. Part One: Weed Killers by the Glass - Health effects of herbicides, Methodology, Findings and Recommondations; Part Two: Citizen's Monitoring Results.

Weed Management, maintained by the Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO), CSIRO Entomology, Canberra, Australia. Available: About this Program of CSIRO, Current Programs & Projects and Results of Research. Research Programs cover the Biological Control of various Weeds. You can also visit the CSIRO European Laboratory (Montepellier, France), where you will find further details in section activities.

Weed Risk Assessment (WRA) and Climate Analysis, the Weed Science Group, Agriculture Western Australia, South Perth. Software tools for WRA and climate analysis. Both programs can be downloaded, instructions are given. Here you will get an overview on the aims and the tools. At the bottom of this page you will find a link to the Weed Science Homepage.

Weed Science Lab, Department of Crop Science, University of Illinois. Available: Research, the physical weed science lab, faculty, staff, links.

Weed Science at Maryland, Cooperative Extension Service, College of Agriculture Natural Resources, Maryland. Information about current weed science research programs, Maryland Weed Reporter.

Weed Science Pages Index, maintained by R. A. Campbell, Canadian Forest Service. Here you will find Jobs in Weed Science as well as weed photos. In miscellaneous weed science intitiatives you will basich information on projects and contact addresses. He is also maintaining a list of weed meetings. Further available are links to other weed science sites or weed science organizations.

Weeds, Crop Protection Manager (CPM) Magazine Online. This is a directory with links to Weed Identification, Weed Management by weed and crop, Herbicides: Application and General Information and Definition of Terms. This collection of links points to several server sites also listed in PPIGB. It is useful, if you are searching for a specific topic.

Weeds Homepage: Biology and Control of annual and perennial weeds, Economics of chemical weed control

Weeds of Native Hawaiian Ecosystems, Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany. This is an annotated bibliography of the genus Psidium with emphasis on P. catteleianum (Strawberry Guava) and P. guajava (Common Guava), Forest Weeds in Hawai'i.

WeedSOFT is a portfolio of easy to-use computer programs. Provide by weed scientists from the University of Nebraska. The program is divided into three parts: (1) The Advisor: A diagnostic & analytic decision support system to help you select the best management solution to your specific weed problem, (2) WeedView: Picture Database for Easy Weed Identification, (3) EnviroFX: Alerts You to Potential Environmental Issues. Also available: A slide show and more in the future.

Weed Strategy Working Group for Tamar Valley, northern Tasmania, Australia. This website is designed as an educational resource for identifying weeds. The index gives a list of weeds. The following information is available: Taxonomy, type of plant, flowers, fruit/seeds, dispersal, distribution, status, impact, and drawings & control methods. Further available: Teacher Resource Guide, Biological Control Agents. Guestbook.

Weeds of the World Project, Department of Plant Sciences, University of Oxford, UK. World Weed Databases, Discussion Group on the Database of the Weeds of the World, Database of Weeds and Invasive Plant Species - Final Report.

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