Managing Weeds
6 | Unit 1.10
- Plant-type classification (give examples)
a) Grasses (monocots, e.g., annual bluegrass, johnson grass)
b) Broadleaves (dicots, e.g., pigweed, black mustard)
c) Brushes (e.g., coyote brush)
d) Woody plants (e.g., willow)
- Daylength classification (give examples)
a) Short-day weeds
b) Long-day weeds
c) Day-neutral weeds
- Seed germination
a) Factors affecting seed dormancy and germination include type of seed coat,
temperature, moisture, oxygen, light, and presence of chemical inhibitors
- Dispersal
a) Weed seed dispersal mechanisms
i. Wind
ii. Irrigation water, seed
iii. Importation on farm equipment
iv. Compost and animal manures
v. Facilitated by birds, gophers, and other animals
vi. Contaminated crop seed
Instructor’s Lecture 1 Outline