Lecture 3 Flashcards
Contact herbicides destroy what plant tissues?
Onlt the ones that it come in contact with.
Name some Phenoxy herbicides:
- 2,4-D
- MCPP
- MCPA
- Dicamba
Name some Non-Phenoxy herbicides:
- Confront
- Turflon ester
- Lontrel
- Drive
- Spotlight
What are some characteristics of Turflon ester?
- Perennial grass control
- In pre-pack mixes it helps control tough weeds like wild onion, ground ivy and speedwells
describe some characteristics of Lontrel:
- 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
What is the safest herbicide to use on Bentgrass?
Lontrel
What is your best option when trying to control pearl wart and moss on greens?
Quicksilver
Why are herbicide mixtures used?
To increse spectrum and control
Name a few pre-packaged herbicide mixtures:
- Trimec
- Confront
- SpeedZone
- 2plus2
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?
Pendimethalin (pendulum)
What weeds is Dicamba very effective on?
Viney weeds
What is the Premier white clover herbicide?
Lontrel
Name a Non-Phenoxy herbicide that also controls white clover
Drive
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?
- A Three Way Mixture + Cafentrazone (Quicksilver)
What effect does Carfentrazone have when mixed with oter broadleaf herbicides?
- Speeds up Burndown
- Improves control
What conditions are needed for effective annual broadleaf weed control?
When is the best time to make a post-emergent herbicide application?
- Good soil moisture, Moderate temperature, Immature weeds
- Late Spring/Early Summer
What is the best timing for perennial broadleaf weed control?
- Late Spring, Early Summer when weeds are immature…….or Early Autumn
Name some Broadleaf herbicides used on Bentgrass:
- 3 way - Bent Formula
- Dicamba
- Lontrel
- MCPP
- Quicksilver
What are some considerations when preparing to apply broadleaf weed herbicides?
- Temps < 78F - (spring & autumn)
- Most herbicides can cause bentgrass to turn yellow
- Apply Chelated iron to mask yellowing
What is the most likely non-target effect that might occur when spraying broadleaf herbicides?
Drift
What is Quicksilver used for?
- To control moss and pearlwart on putting greens
- to mix with other herbicides to increase the burn down effect and improve control
Is there any reason to control winter annuals?
Most often, no. you can let them flower and continue to mow them. they will be gone by summer.
