Introduction

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Crops and Staging:
Irrigated potato* prior to flower initiation.
Potato tolerance differs by variety. Limit first use to a small area of each variety prior to widespread adoption in the field.
Delay cultivation for 7 to 10 days after application.
* NOTE - Since applications to irrigated potato in western Canada has been registered under the User Requested Minor
Use program, the manufacturer assumes no responsibility for herbicide performance. Application to irrigated potato in
western Canada is at the risk of the user.
Weeds, Rates and Staging:
24 g per acre (one package treats 20 acres) controls the following weeds at the stage indicated:
Weeds
Weed Stage
Barnyard grass, Foxtail (green, yellow), Witch grass
1 to 6 leaf, maximum 2 tillers
Quackgrass
3 to 6 leaf (less than 10 inches or 25cm leaf extended)
Lamb’s-quarters*, Redroot pigweed
4 to 6 leaf (less than 4 inches or 10 cm tall or across)
* Suppression
Add a recommended non-ionic surfactant such as Citowett Plus, Agsurf II, or Agral 90 at 0.2 L per 100 L spray solution.
Maximum one application per year of Prism SG and other products containing the active ingredient rimsulfuron.
Refer to the product label for complete mixing instructions for this product and its mixes. A general guide to mixing can be
found on page 8.
Application Information:
• Water Volume: Minimum 40 L per acre.
• Nozzles and Pressure: 25 to 40 psi (175 to 275 kPa) when using conventional flat fan nozzles. Low drift nozzles may
require higher pressures for proper performance. Use a combination of nozzles and pressure designed to deliver
thorough, even coverage of ASABE medium droplets.
• Screens: Use a 50 mesh or coarser screen and filter system.
How it Works:
Refer to Table 9 on page 48.
Effects of Growing Conditions:
Apply when the temperature 24 hours before and after application is between 5 o C and 28 o C. Temperatures beyond this
range increase the potential for crop injury. Rapid fluctuations in temperature will stress the crop (greater than a 20 o C
difference within 24 to 36 hours). Allow 48 to 72 hours for the crop to acclimatize before spraying if severe temperature
fluctuations occur.
Crop injury may result if applications are made when potatoes are stressed by abnormally hot, humid, or cold weather
conditions, frost, low fertility, drought, water saturated soil, compacted soil, previous pesticide applications, disease or
insect damage. If potatoes have been injured by frost, wait 48 to 72 hours after normal growing conditions have resumed
before applying.
Warm, moist conditions after application promote good weed control while cool and/or dry conditions may reduce or delay
activity. Weeds hardened off by cold weather or drought stress may not be controlled.
Tank Mixes:
None registered.