Grassweed Control Flashcards
Describe the cultural control for grassweeds in WW.
Delay drilling, stale seed bed
Competitive varieties such as Skyfall - tiller fast
Soil testing - ensure sufficient nutrient availability to provide best environment for crop development
Rotational ploughing - bury weed seeds
Rotations - break crops such as OSR provide measn for using different chemsitry
Name 5 common residual actives used to control grassweeds.
Pendimetahalin, DFF, flufenacet, Aclinofen, metribuzin
Which grassweed is flufenacet the base for?
Blackgrass
What grassweed is pendimethalin the base for?
Brome
What grassweed is Prosulfcarb the base for?
Ryegrass
What does Aclinofen bring to the party?
Blackgrass control - different active so antiresistance strategy
What does metribuzin bring to the party?
Antiresistant strategy for blackgrass and brome
What crop safety measures are required for pre-emergence herbicides?
Minimum seed depth of 1.5 inches; rolling for high seed-soil contact; do not apply with heavy rain forecasted; do not apply to stony soils
Why is it an issue to apply pre-emergence herbicides to stony soils?
Wash down stones and forms concentrates in the soil - uneven distribution
Talk about sandy soils and pre-emergence herbicides.
Low retention, quickly lost through the soil profile so lower efficacy
What actives are effective on ryegrass and wild oats?
Pinoxaden - Axiel Pro
What actives are in Broadway Star and what do they control?
Florasulam and Pyroxulam - ryegrass and wild oats
What actives are in auxillary and what do they control?
Prosulfcarb and clodinafop - B/G
What is a common post-emergence contact spray for blackgrass, AMG and brome?
Horus - mesosulfuron and iodosulfuron
What is the key to remember about SUs?
1 per crop
