Herbicide label

Topeka Plus

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.

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Official EPA label (PDF)

“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 EPA label, Reg. No. 83100-45-83979

Topeka Plus label facts

Product Topeka Plus
EPA Reg. No. 83100-45-83979
Distributor Rotam North America, Inc.
Active ingredient 2,4-d and dicamba
MOA group 4

Crops on the Topeka Plus label

Topeka Plus is labeled for these 16 crops and uses, per the EPA label.

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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
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
sedge
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

Suppression

suppression2

sowthistle
sowthistle, perennial

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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 and your soil texture.

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Plant-back and rotation

Your interval depends on your application rate, the rotational crop, and your state, region, and rainfall — some intervals differ in AK, AL, AR, AZ, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, and WY.

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, 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.

What's the plant-back interval after Topeka Plus?

It depends on your rotational crop, application rate, and region, so the label gives a table, not one number. Build a program and FieldMarshal gives you the exact interval for your rotation from the label line, so you can verify it.

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Can I tank-mix Topeka Plus?

It depends on your target weeds, crop stage, and which partners the label approves. Build a program and FieldMarshal checks the label for approved partners and gives the condition on each, so you can verify it.