Lecture 3

Question 1

What type of environmental factors (weather, soil type…etc.) should be considered when choosing a PGR?

Answer 1

.

Question 2

What type of cultural factors (mowing, fertility…etc.) should be considered when choosing a PGR?

Answer 2

• Using PGR’s slows plant growth which means less mowing and less clippings.
• Mowers last longer…less maintenance, less hours
• Lesser chance for scalping
• Trimming and Edging
• Should supplement with Iron or Nitrogen to avoid chlorosis (leaf yellowing)

Question 3

What is the jar test and why is it necessary to perform when working with a new PGR?

Answer 3

• Mixing the chemicals (at the same ratios as you would in the tank) in a jar to see if they are compatible.
• They could form a percipitate and clog nozzles
• They might not mix and instead form layers

Question 4

Should a new PGR be tank mixed and sprayed on a high‐value area? If not, how should you approach a new PGR for use on your course?

Answer 4

• No it shouldn’t. It should always be tested on a nursery or practice green or out of play area.
• Do Not tank mix a new product. See what it’s effects are alone first.
• Ask other Superintendants what rates they use and compare to label rate to find a good starting point.
• Apply to healthy, actively growing turf

Question 5

Why should nozzle size and travel speed be considered when working with PGRs?

Answer 5

• Nozzle size determines the droplet size
• Small droplets for Foliar uptake
• Large droplets for Root uptake
• Travel speed determines how much product you are putting down over a certain area.

Question 6

What are important factors to considder when planning a PGR application?

Answer 6

• Site of uptake for the product
• Nozzle Size
• Carrier Volume
• Using a surfactant or not
• SPeed of tavel for sprayer

Question 7

What type/class of PGR can help minimize or avoid scalping when irrigation or rainfall is excessive?

Answer 7

• GA inhibitors
• Class A or Class B

Question 8

What type/class of PGRs should be used on the hard‐to‐mow or low maintenance areas?

Answer 8

• A PGR that slows vertical growth….Less mowing of dangerous area = less chance for accidents
• Class C would beneficial…Class A or B would be okay too

Question 9

What are some reasons that you may need to increase or decrease your rate of application?

Answer 9

• Time of year
• Environmental conditions
• species
• previous records showed that the last application did too much or not enough.

Question 10

PGRs can make the striping effects better in your turf…..how?

Answer 10

PGR’s increase turf density and usually change leaf morphology.