Lecture 4 Flashcards
Describe the differences in growth habit between annual bluegrass and creeping bentgrass
Bentgrass - has stolons, doesnt produce seedheads when its mowed, Poa Annua - Bunch type, (some have weak stolons), Abundant seedheads even if mowed short,
describe Differences in stress and disease tolerance between the two grass species:
Poa Annua - less tolerant to drought stress than Bentgrass, prone to anthracnose and summer patch, light green color Bentgrass - Not prone to anthracnose or summer patch, Dark green in color
Major problems associated with annual bluegrass invasion long and short‐term:
It detracts from uniformity of bentgrass canopies, Changes ball roll, changes speed, affects the way you manage your turf,
Growth stage during which chemical control of annual bluegrass is most effective
Mid-Late Boot Stage when their is a bulge in the leaf sheath is the best time to apply chemical control.
Purpose of Growing Degree Day (GDD) models and how they benefit the turf manager
Purpose of GDD model is to track heat units which accumulate throughout the year and are necessary for the growth and development of plants and insects. They benefit us because it provides a science based window of opportunity to make your treatments as effective as possible.
Why are Primo and Proxy are typically tank mixed together (what does each chemical do)
Proxy stimulates Ethylene production which controls seed head production but causes chlorosis (yellowing) Primo inhibits GA production and prevents the leaf blades from elongating while counteracting proxy’s chlorosis to maintain the dark green color.
What type of “effect” are you getting with using both products?
a Synergistic effect
What is Embark used for?
Poa Annua seed head suppression
What Embark product is labeled saying it can be used on greens?
Embark TO
What is one advantage of using Embark TO?
No reapplication is required
If timed correctly, what product is the best for suppressing Poa Annnua seed head production? How much can it control?
Embark TO…can control 70-80% if timed correctly
Why is annual bluegrass so difficult to control by chemical and/or mechanical methods?
It can have several ecotypes in one stand each ecotype has slight genetic differences that allow it to be extremely resiliant and resistant to some products. Poa Annua is highly adaptable to different conditions It makes A LOT of seeds that are viable for multiple years
Major pros and cons associated with chemical controls for annual bluegrass
Chlorosis Some products cannot be used on KBG or greens hight Bentgrass Problems with incosistency Most products require multiple applications
When should you apply pre-emergence products for controling crabgrass?
prior to the soil warming up
What time of year should you apply chemical treatments to control broadleaf weeds most effectively?
In the Fall
