Lecture 3

Question 1

Contact herbicides destroy what plant tissues?

Answer 1

Onlt the ones that it come in contact with.

Question 2

Name some Phenoxy herbicides:

Answer 2

• 2,4-D
• MCPP
• MCPA
• Dicamba

Question 3

Name some Non-Phenoxy herbicides:

Answer 3

• Confront
• Turflon ester
• Lontrel
• Drive
• Spotlight

Question 4

What are some characteristics of Turflon ester?

Answer 4

• Perennial grass control
• In pre-pack mixes it helps control tough weeds like wild onion, ground ivy and speedwells

Question 5

describe some characteristics of Lontrel:

Answer 5

• The safest material to use on Bentgrass
• Removed from lawn care market because it can persist on clippings for over 1 year. Clippings used as mulch will kill vegetables and possibly injure other plants in the landscape

Question 6

What is the safest herbicide to use on Bentgrass?

Answer 6

Lontrel

Question 7

What is your best option when trying to control pearl wart and moss on greens?

Answer 7

Quicksilver

Question 8

Why are herbicide mixtures used?

Answer 8

To increse spectrum and control

Question 9

Name a few pre-packaged herbicide mixtures:

Answer 9

• Trimec
• Confront
• SpeedZone
• 2plus2

Question 10

What is the most broad spectrum pre-emergent herbicide that is used for annual grassy weeds (like crabgrass) that has some activity on broadleaf weeds?

Answer 10

Pendimethalin (pendulum)

Question 11

What weeds is Dicamba very effective on?

Answer 11

Viney weeds

Question 12

What is the Premier white clover herbicide?

Answer 12

Lontrel

Question 13

Name a Non-Phenoxy herbicide that also controls white clover

Answer 13

Drive

Question 14

Winter Annuals are difficult to control due to cool/cold spring temps….but what would be a good option for a post-emergent if you want to spray for them?

Answer 14

• A Three Way Mixture + Cafentrazone (Quicksilver)

Question 15

What effect does Carfentrazone have when mixed with oter broadleaf herbicides?

Answer 15

• Speeds up Burndown
• Improves control

Question 16

What conditions are needed for effective annual broadleaf weed control?

When is the best time to make a post-emergent herbicide application?

Answer 16

• Good soil moisture, Moderate temperature, Immature weeds
• Late Spring/Early Summer

Question 18

What is the best timing for perennial broadleaf weed control?

Answer 18

• Late Spring, Early Summer when weeds are immature…….or Early Autumn

Question 19

Name some Broadleaf herbicides used on Bentgrass:

Answer 19

• 3 way - Bent Formula
• Dicamba
• Lontrel
• MCPP
• Quicksilver

Question 20

What are some considerations when preparing to apply broadleaf weed herbicides?

Answer 20

• Temps < 78F - (spring & autumn)
• Most herbicides can cause bentgrass to turn yellow
• Apply Chelated iron to mask yellowing

Question 21

What is the most likely non-target effect that might occur when spraying broadleaf herbicides?

Answer 21

Drift

Question 23

What is Quicksilver used for?

Answer 23

• To control moss and pearlwart on putting greens
• to mix with other herbicides to increase the burn down effect and improve control

Question 24

Is there any reason to control winter annuals?

Answer 24

Most often, no. you can let them flower and continue to mow them. they will be gone by summer.

Question 25

What are 2 summer annual broadleaf weeds?

Answer 25

• Black Medic
• Common Chickweed

Question 26

What perennial broadleaf weeds produce either rhizomes, stolons, or bulbs?

Answer 26

• Wild Garlic
• White Clover
• Creeping Woodsorell

Question 27

What broadleaf weeds does quinclorac (Drive) control?

Answer 27

• White Clover
• Violets
• Speedwells
• Crabgrass

Question 28

What are Basamid and Methyl Bromide and How do they Differ?

Answer 28

• Fumigants
• MB is a gas….Basamid is a granular