Problem Weed Control in
Table of Contents
The information presented here intended to provide growers with
control options for problematic weed species in corn, soybeans and
To find information on a particular weed species, you can either
search by "common weed name" (i.e. Dandelion) or "scientific
weed name" (i.e. Taraxacum officinale). Either way you
will be directed to a list of species included in this document.
The content in this publication is for informational purposes only.
By providing this information, the University of Guelph, it's employees
or agents, Agriculture and Agri-food Canada, and the Ontario Ministry
of Agriculture and Food do not offer any warranty or guarantee,
nor do they assume any liability for any crop loss, animal loss,
health, safety or environmental hazard caused by the use of a pesticide
mentioned in this publication.
The use of Trade names in this publication is for the user's convenience
only. It is neither an endorsement of a particular product nor a
suggestion that similar products are ineffective.
There are a number of herbicides referred to in this publication
which may not be currently registered. Always follow label directions
when applying herbicides.
Search by Common Weed Name
Weed species are listed in alphabetical order by the
main common name. For example, if you wanted to find information
on "Spreading atriplex" it would be listed as Atriplex,
Search by Scientific Weed Name
Weed species are listed in alphabetical order by genus.
List of Contributors
Research Scientist, Weed Management
Greenhouse Processing and Crops Research Centre, Harrow ON.
Current research concentrates on the integration of weed management
into conventional and no-till (conservation till) production systems
for corn, soybeans, tomatoes and sugarbeets for Southwestern Ontario.
He also plays an integral role in the Minor Use registration for
numerous herbicide treatments for use in tree fruit new plantings,
mature orchards, tomatoes and seed corn.
Honours and Awards
2002 - President of the Weed Science Society of America
1999 - Named to the Essex County "Hall of Fame" for contributions
to local and national agriculture
University of Guelph, Department of Plant Agriculture Ridgetown
Evaluation of new herbicides for use in field and horticultural
crops. Determine the spectrum of weeds controlled and crop safety.
Evaluate weed management programs in herbicide resistant crops such
as Roundup Ready corn and Roundup Ready soybeans. Develop weed management
strategies for the control of problem weeds in corn, soybeans and
wheat. Determine the effect of crop row width and seeding density
on weed management. Determine the impact of long-term weed management
systems on weed shifts.
University of Guelph, Department of Plant Agriculture
My research goal is to facilitate the integration of ecological
principles into crop production systems. My major area of research
has been to design and implement integrated weed management systems
for field and horticultural crops grown in Ontario. Selected areas
of study have included weed and crop modelling, weed biology and
ecology, economics of weed management and managing weeds with herbicides.
François J. Tardif
University of Guelph, Department of Plant Agriculture
My main interest is currently in the understanding of herbicide
resistance in weeds. This includes topics such as:
- Characterisation of new cases
- Development of diagnostic tools
- Understanding the effect of resistance mutations on fitness
- Developing management programs
Weed-Crop Ecologist, Greenhouse Processing and Crops Research Centre,
My research focuses on weed biology and ecology, and the development
of integrated weed management systems in field crops. We conduct
field and laboratory experiments to determine seed germination requirements,
emergence patterns and seed production of different weed species
in relation to crop management practices. Another objective is to
quantify crop yield losses and establish economic thresholds for
various weed species in soybeans and corn. This has led to the release
of decision support software for weed management in these crops
Weed Management Lead Ontario Ministry of Agriculture and Food -
My goal is to identify the major weed management issues facing
the Ontario Grower and then work with our awesome team of weed researchers
to provide practical, economical and environmentally responsible
Researchers at the University of Guelph and Agriculture and Agrifood
Canada are fortunate to have an amazing team of field technicians.
Without them, the field work would simply not get done at the high
level that it does.
- Dave Bilyea - Ridgetown Research Station
- Kevin Chandler - Elora and Woodstock Research Station
- Kerry Cheney - Ridgetown Research Station
- Todd Cowan - Huron Park Research Station
- Yvonne McLellan - Ridgetown Research Station
- Kris McNaughton - Ridgetown Research Station
- Christy Shropshire - Ridgetown Research Station
- Peter Smith - Elora and Woodstock Research Station
- Josh Vyn - Ridgetown Research Station
- Mac Whaley - Greenhouse and Processing Crops Research Centre
Weed Photographs - References:
We would like to acknowledge the following sources for the photographs
shown throughout this document:
- 1000 Weeds of North America - Illustrated CD
An amazing database of 1000 weeds found throughout North America.
This interactive CD is very easy to use, has numerous colour photographs
and will also direct you to page numbers of the most popular weed
indentification books in order to get more information. To order
this CD visit the XID Services website.