Weed Science

Question 1

Dicot weeds (two cotyledons), such as dandelion and pigweed

Answer 1

Broadleaf weed

Question 2

Monocot (one cotyledon) weeds such as bermudagrass, Johnson grass, and dallis grass

Answer 2

Grass weed

Question 3

An environmentally friendly method of using solar power (sunlight) for controlling pests through heat and heat retention

Answer 3

Solarization

Question 4

Monocots that look similar to grasses but have glossy leaves and a triangular stem

Answer 4

Sedge

Question 5

A nonnative to an ecosystem where the introduction causes or can cause economic or environmental damage or human harm

Answer 5

Invasive species

Question 6

Chemicals that kill plants or suppress their growth by interrupting normal growth processes

Answer 6

Herbicide

Question 7

Affecting the entire body or organism, specifically a type of herbicide that enters and moves through plant tissue

Answer 7

Systemic herbicide

Question 8

A type of herbicide that controls only the portion of the plant that it contacts

Answer 8

Contact herbicide

Question 9

Whare are three considerations of determining if a plant is a weed?
A. Use, beauty, size at maturity
B. Value, aesthetics, whether it’s poisonous or not
C. Location, growth habit, interference

Answer 9

C.

Question 10

Which of the following are classifications of weeds?
A. Dicots, monocots, or a sedge
B. Broadleaf, a grass or a sedge
C. Annual weeds, biennial weeds or perennial weeds
D. All of the above

Answer 10

D.

Question 11

Give three characteristics of weeds.

Answer 11

Resistant to control strategies; multiple modes of reproduction; rapid maturation

Question 12

What are some examples of negative impacts of weeds?
A. Hosts for pests or pathogens
B. Interfere with infrastructure
C. Allergies and toxins
D. Disrupt land use, recreation, aesthetics
E. All of the above

Answer 12

E.

Question 13

Which of the following is NOT an important rule to follow when managing perennial weeds with cultivation?
A. Remove as much of the perennial root structure as possible from the soil.
B. Wait 1-2 weeks after perennial weeds have emerged before initiating cultivation.
C. Continue similar cultivation intervals until the weed is effectively removed.
D. If the problem does not improve treat with a residual herbicide.

Answer 13

D.

Question 14

Reducing the amount of space between crops creating a canopy effect that reduces the amount of sunlight for weeds.

Answer 14

Row spacing

Question 15

The oldest and most effective method of weed control

Answer 15

Hand weeding

Question 16

Inspecting the soil, seeds, and roots before planting

Answer 16

Sanitation

Question 17

Chemicals that kill or suppress the growth of plants

Answer 17

Herbicides

Question 18

Mechanically disturbing the soil in order to uproot weeds

Answer 18

Cultivation

Question 19

Killing plant growth by cutting

Answer 19

Mowing

Question 20

Smothering or preventing light from reaching the weed seeds

Answer 20

Mulching

Question 21

Killing pests by covering the soil with a clear plastic allowing sunlight through while trapping heat between the plastic and the soil and destroying weed seeds

Answer 21

Soil solarization

Question 22

A herbicide that will control certain weeds but will not cause injury to a desired plant if the correct rate is applied is called a:
A. Systemic herbicide
B. Residual heribicide
C. Selective herbicide
D. Non-selective herbicide

Answer 22

C.

Question 23

Which of the following is not true about a systemic herbicide?
A. It enters the plants and moves freely in the xylem and/or phloem of the vascular system.
B. It is better at controlling larger weeds and perennial weeds.
C. Examples are glyphosate and imazapyr.
D. It only controls the portion of the plant that the spray covers.

Answer 23

D.