Herbicide label
Princep Caliber 90 Herbicide Label
Princep Caliber 90 (EPA 100-603) is a Group 5 simazine herbicide labeled for 3 crops. The label lists 46 controlled weeds, plus partial-control, suppression, and partner-control categories.
“This product is noncorrosive to equipment, nonflammable, and has low electrical conductivity.”
Princep Caliber 90 label facts
- Product Princep Caliber 90
- EPA Reg. No. 100-603
- Registrant Syngenta Crop Protection, LLC
- Active ingredient simazine
- MOA group 5
Crops on the Princep Caliber 90 label
Princep Caliber 90 is labeled for these 3 crops and uses, per the EPA label.
Weeds on the Princep Caliber 90 label
The Princep Caliber 90 label names 56 weeds and rates each by how the product handles it: full control, partial control, suppression, or control with a tank-mix partner. A weed can fall at more than one level, because control varies by crop, rate, and timing.
Controls
full control46- alyssum
- barnyardgrass, common
- bluegrass, annual
- brome, downy
- burclover
- carelessweed
- carpetweed
- chickweed, common
- crabgrass
- rattail fescue
- fiddleneck
- filaree, broadleaf
- fireweed
- fivehook, bassia
- foxtail
- goosegrass
- groundsel, common
- hairgrass, silver
- henbit
- junglerice
- knawel
- lambsquarters, common
- prickly lettuce
- morningglory species, annual
- mustard, tansy
- mustard, wild
- nightshade species, annual
- wild oats
- paintbrush, flora's
- panicum, fall
- pepperweed
- pepperweed, yellow flower
- pigweed
- pineapple-weed
- purslane, common
- pusley, florida
- ragweed, giant
- redmaids
- ryegrass, annual
- shepherd's-purse
- signalgrass species
- smartweed species, annual
- needles, spanish
- speedwell
- thistle, russian
- witchgrass
Partial control
partial2- balsamapple vine
- milkweed, honeyvine
Suppression
suppression1- quackgrass
Controls with a tank-mix partner
needs partner7- clover species
- dandelion
- evening-primrose, cutleaf
- horseweed
- lambsquarters
- puncturevine
- velvetleaf
Princep Caliber 90 rates and plant-back
The label answers both with a table, not a single number. Here is what drives each answer.
Application rate
Your rate depends on your crop.
Get the rate for your field: build a program and FieldMarshal gives you the exact per-acre rate for your crop from the label line.
Plant-back and rotation
Your interval depends on your application rate and the rotational crop.
Get the interval for your rotation: build a program and FieldMarshal gives you the exact plant-back for your rotational crop from the label line.
Princep Caliber 90 FAQ
What weeds does Princep Caliber 90 control?
The Princep Caliber 90 label names 56 weeds, including alyssum, common barnyardgrass, annual bluegrass, downy brome, burclover, and carelessweed. Control varies by crop, rate, and timing.
What crops is Princep Caliber 90 labeled for?
Princep Caliber 90 is labeled for 3 crops and uses, including field corn, popcorn, and sweet corn.
What is the active ingredient in Princep Caliber 90? Is it a generic?
Princep Caliber 90's active ingredient is simazine (MOA Group 5). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.
Sources
Last updated 2026-09-30.