Agricultural Weed Management Principles Flashcards
How many seed leaves do grasses have?
One
How many See leaves do broadleaf plants have?
Two
When do Summer Annual plants germinate?
Spring and Summer
When do Winter annual plants germinate?
Late Summer or Early Winter
How long does it take for Biennial plants to complete their life cycle?
Within two years
Explain the life cycle of a biennial plant:
Year One the plant forms basal leaves and a tap root.
Year Two the plant flowers, matures and dies.
Are there any biennial grasses or sedges?
No
What is the rosette stage of plant growth?
When the plant forms basal leaves.
What are the two ways that perennial plants spread?
Simple or Creeping
Simple perennial plants spread by:
primarily by seed
Creeping perennial plants spread by:
Creeping roots, Stolons and Rhizomes
What are the different ways to mechanically control weeds?
Tilling, Mowing, Flooding, Fire, Mulching
Give examples of Cultural Control for weeds
Crop Competition
Crop Rotation
Nurse Crops
Irrigating Fields
How are herbicides applied so they can be absorbed through the plant?
Directly onto the plant
To the soil where the weed will emerge
to control annual and biennial weeds, what part of the plant does the herbicide need to kill?
the shoots
to kill perennial weeds, what part of the plant does the herbicide need to kill?
the roots
what is an important consideration when applying a contact herbicide?
you must have good coverage - the herbicide will only kill the vegetation that it touches.
Will contact herbicides kill perennial plants?
No
translocated herbicides are also called:
Systemic herbicides
What can make a systemic herbicide less effective?
stressed plants that aren’t transporting sugars and water throughout their systems so the herbicide doesn’t move throughout the entire plant.
what are some common systemic herbicides?
2,4-D, MCPA, Diuron, glyphosate, dicamba
Residual Herbicides are also know as:
Pre-Emergent herbicides
how many modes of action are there in herbicides?
7
Name the herbicide Modes of Action:
PGR Amino Acid Synthesis Inhibitors Lipid Inhibitors Seedling Growth Inhibitors Photosynthesis Inhibitors Cell Membrane Disruptors Pigment Inhibitors
