CROP*4240 Weed Science

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The following description is for the course offering in Fall 2018 and is subject to change. It is provided for information only. The course outline distributed to the class at the beginning of the semester describes the course content and delivery, and defines the methods and criteria to be used in establishing the final grades for the course.

Weeds will be studied in relation to agricultural practices. Principles of chemical, mechanical and biological control will be outlined. Laboratories will include weed identification, weed control methods, and demonstrations of the effects of various herbicides.

This course aims at discovering these plants we don’t want and we call weeds.

  • What are they?
  • Why are they causing problems?
  • How can we manage them?

Prerequisite(s): AGR*2470

Instructors:

Teaching Assistant:

Credit Weight:

0.50

Course Level:

  • Undergraduate

Academic Department (or campus):

Department of Plant Agriculture

Campus:

Guelph

Semester Offering:

  • Fall

Class Schedule and Location:

Please refer to Web Advisor for class schedule and location.

Learning outcomes:

By the end of this course, you should be able to:

  1. Synthesize knowledge, facts and information from different sources, pertaining to weed biology and management and be able to explain how they are interrelated; demonstrated through successful completion of assignments and exams.
  2. Critically assess the value of different weed management strategies; demonstrated through successful completion of assignments, exams and lab exercises.
  3. Identify 80 of Ontario’s most common weeds and understand their key characteristics; demonstrated though successful completion of weed identification quiz.
  4. Be able to identify herbicide injury through analysis of symptomology and selectivity.
  5. Be able to synthesize and understand facts explaining an aspect of herbicide mode of action.

Lecture Content:

Topics to be covered in lecutre include:

  • Introduction to weeds and their biology; problems due to weeds; lifecycles
  • Seed dormancy; germination and seed-banks
  • Vegetative reproduction
  • Sucession, life cycle, dispersal of weeds
  • Competition and alleopathy, managing competition
  • Cultural control
  • Biological Control
  • Physical and mechanical control
  • Herbicide formuation and application; herbicide uptake and movement
  • Herbicide target sites
  • Herbicide metabolism and selectivity
  • Photosynthesis inhibitors
  • Pigment synthesis inhibitors
  • Amino acid synthesis inhibitors
  • Auxin mimics
  • Fatty acid synthesis inhibitors
  • Cellulose synthesis and tubulin assembly inhibitors
  • Herbicide resistant crops
  • Herbicide resistant weeds
  • Future of weed managment
Labs & Seminars:

Labs will concentrate on weed identification and herbicide diagnostic.

Course Assignments and Tests:

Assignment or Test
Contribution to Final Grade
 

Mid term 1

30%

 

2 Quizes

20%

 

Lab assignment

15%

 

Final Exam

35%

 

Final examination:

Please refer to Web Advisor for class schedule and location.

Course Resources:

Required Texts:

None

Recommended Texts:

Identification Guide to Weeds of Ontario (textbook)

Lab Manual:

None

Other Resources:

Any material produced by the instructor in a written format will be distributed in class and be made available on D2L.

Field Trips:

Not applicable.

Additional Costs:

Not applicable.

Course Policies:

Grading Policies:

Rescheduled exams: The midterm and final exam must be written on the date scheduled unless there is a documented timetabling conflict. Please advise the instructor in writing of any scheduling conflict prior to week 5.

Course Policy regarding use of electronic devices and recording of lectures:

Recording of classes, either electronically or otherwise, is expressly forbidden without consent of the instructor.  When recordings are permitted they are solely for the use of the authorized student and may not be reproduced, or transmitted to others, without the express written consent of the instructor.

Other Course Information:

University Policies

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