Insecticides
399
• 
Safety - page 25 • First aid - page 33 • Resistance management - page 41
Crops
Stage
Insects controlled
Rate per acre
Sunflower
Soil or foliage
Army cutworm, pale western cutworm, redbacked cutworm
485
mL
Lentils
(
Lorsban/
Citadel/Nufos
only)
Pale western cutworm
354 - 485
mL
Grasshoppers
234 - 485
mL
Potato
Soil or seedling
Colorado potato beetle (larvae), potato flea beetle , tarnished plant bug 404 mL
Black cutworm, darksided cutworm, redback cutworm
Soil: 970 mL
Seedling: 485 - 970 mL
Sugar beet
Soil or seedling
Pale western cutworm, redbacked cutworm
485 - 970
mL
Registered Tank Mixes
Citadel, Lorsban, Nufos and Pyrinex may be tank mixed with 2,4-D amine and ester, Avenge, Banvel II + 2,4-D
amine, Buctril M, MCPA amine and ester. Logic M can be tank mixed only with Citadel.
Caution
:
When tank mixing, always add the herbicide to the spray tank first and then add Citadel, Lorsban, Nufos or
Pyrinex.
Application Information
How to Apply
:
Ground and aerial application (unless otherwise specified on the label).
Water Volume
:
Ground: 20 - 80 L/acre. Aerial: 4 - 12 L/acre minimum.
Application Tips
Uniform coverage of crop is essential: use a boom configuration that provides optimum coverage. Use higher rates
when infestations are heavy and when foliage is dense.
Bertha armyworm, and armyworm
:
Use higher rate for large larvae and when canopy is dense.
Cutworms
:
Higher rates and water volumes when the top 1 cm of soil surface is extremely dry or when the
infestation is heavy.
Foliage treatments
:
When spraying crops near maturity, an application system that gives maximum penetration of
the crop canopy is necessary to get good insect kill. Do not apply to crops in bloom. Best results will be obtained
when application is made during early evening. Avoid application under hot temperatures. Do not apply to plants
under extreme drought stress.
How it Works
Chlorpyrifos is a broad-spectrum, nonsystemic and contact organophosphate insecticide and acaricide.
Expected Results
Insects must come in direct contact with the insecticide to be affected. Degrades on foliage by weathering, and a
significant kill of insects eating treated foliage may not last beyond 48 hours after treatment. Somewhat more
persistent in soil; control of soil-dwelling insects may be more durable.
Restrictions
Rainfall
:
Foliar treatments: should be made 4 - 6 hours before forecast rainfall. Soil treatment: should not be applied
if heavy rainfall is forecast.
Grazing
:
Cereals grown for cover crop treated with chlorpyrifos insecticide should not be harvested for human or
animal consumption if treated within 60 days of harvest.
Pre-harvest interval (days)
:
Barley, oats, wheat (60), canola (21), corn – field and sweet only (70),
flax (21), lentils (21 days for applications up to 354 mL/acre), (60 days for applications greater than 354 mL/acre),
potatoes (7), sugarbeets (90), sunflowers (42).
Re-entry
:
Do not enter treated field for at least 24 hours after application.
Re-cropping
:
No information is specified on the label.
Maximum Allowable Applications
:
Barley, oats, wheat, canola, corn, flax, lentil, sunflower, potatoes - do not apply
more than once per season. See label for restrictions on other crops.
Lorsban/Pyrinex/Nufos/Citadel (cont’d)