Herbicide label
Topeka Plus Herbicide Label
Topeka Plus (EPA 83100-45-83979) is a Group 4 2,4-d and dicamba herbicide labeled for 16 crops. The label lists 82 controlled weeds, plus partial-control, suppression, and partner-control categories.
“This product is a selective post-emergence herbicide for controlling a wide spectrum of annual, biennial, and perennial broadleaf weeds and brush in grass forages and selected row crops.”
Topeka Plus label facts
Crops on the Topeka Plus label
Topeka Plus is labeled for these 16 crops and uses, per the EPA label.
Weeds on the Topeka Plus label
The Topeka Plus label names 84 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 control82- amaranth, palmer
- beebalm, spotted
- bindweed, field
- bittercress
- broomweed, annual
- buckwheat, wild
- buffalobur
- burdock
- buttercup
- carrot, wild
- chickweed, common
- chicory
- clover, bur
- cockle, cow
- cocklebur, common
- coreopsis, plains
- croton, woolly
- dandelion, common
- devil's claw
- dock, curly
- dog fennel
- evening primrose
- flax
- fleabane, annual
- flixweed
- goldenrod, missouri
- goldenweed, common
- groundsel, texas
- henbit
- honeysuckle, hairy
- horsenettle
- poison ivy
- knapweed, black
- knapweed, russian
- knapweed, spotted
- knotweed
- kochia
- lambsquarters, common
- mallow, common
- marshelder
- horseweed
- mesquite
- milkweed, antelope horn
- morningglory, ivyleaf
- morningglory, tall
- mustards, annual
- mustard, tansy
- nightshade, black
- nightshade, silverleaf
- pennycress, field
- pepperweed, virginia
- pigweed, prostrate
- pigweed, redroot
- pigweed, smooth
- pigweed, tumble
- poorjoe
- prickly lettuce
- purslane, common
- rabbitbrush
- ragweed, common
- ragweed, lanceleaf
- ragweed, western
- ragwort, tansy
- redvine
- shepherd's-purse
- smartweed
- smartweed, pennsylvania
- sneezeweed, bitter
- sorrel, red
- spurge, leafy
- sunflower
- tallow tree, chinese
- thistle, bull
- thistle, canada
- thistle, musk
- thistle, plumeless
- thistle, russian
- vetch, hairy
- waterhemp, common
- yankeeweed
- yellow star thistle
- sedge
Suppression
suppression2- sowthistle
- sowthistle, perennial
Topeka Plus 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.
Topeka Plus FAQ
What weeds does Topeka Plus control?
The Topeka Plus label names 84 weeds, including palmer amaranth, spotted beebalm, field bindweed, bittercress, annual broomweed, and wild buckwheat. Control varies by crop, rate, and timing.
What crops is Topeka Plus labeled for?
Topeka Plus is labeled for 16 crops and uses, including field corn, soybeans, wheat, cotton, and barley.
What is the active ingredient in Topeka Plus? Is it a generic?
Topeka Plus's active ingredient is 2,4-d and dicamba (MOA Group 4). 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.