Herbicide label

Merissa

Merissa (EPA 83529-171) is a Group 2 metsulfuron-methyl herbicide labeled for 8 crops. The label lists 35 controlled weeds, plus partial-control, suppression, and partner-control categories.

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Official EPA label (PDF)

“Merissa is absorbed through the foliage of broadleaf weeds, rapidly inhibiting their growth.”

— Merissa EPA label, Reg. No. 83529-171

Merissa label facts

Product Merissa
EPA Reg. No. 83529-171
Registrant Sharda USA LLC
Active ingredient metsulfuron-methyl
MOA group 2

Crops on the Merissa label

Merissa is labeled for these 8 crops and uses, per the EPA label.

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Weeds on the Merissa label

The Merissa label names 47 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 control35

buttercup, bur (testiculate)
catchfly, conical
chamomile, false
mayweed, chamomile
chickweed, common
coreopsis, plains
cowcockle
falseflax, smallseed
fiddleneck, coast (tarweed)
filaree, broadleaf
groundsel, common
henbit
kochia
lambsquarters, common
lambsquarters, slimleaf
prickly lettuce
miner's lettuce
mustard, blue/purple
mustard, treacle (bushy wallflower)
mustard, tumble/jim hill
mustard, wild
pennycress, field (fanweed)
pigweed, redroot
pigweed, smooth
pigweed, tumble
purslane, common
shepherd's-purse
smartweed, green
smartweed, ladysthumb
smartweed, pale
speedwell, snow
sunflower, volunteer
tansymustard
thistle, russian
waterpod

Partial control

partial3

kochia
prickly lettuce
thistle, russian

Suppression

suppression6

buckwheat, wild
gromwell, corn
knotweed, prostrate
sowthistle, annual
sunflower, annual
thistle, canada

Controls with a tank-mix partner

needs partner7

cocklebur, common
horseweed
puncturevine
sunflower, annual
sunflower, wild
velvetleaf
winter annual broadleaf weeds

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Merissa 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.

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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 CO, ID, KS, MN, MT, ND, NE, NM, OK, OR, SD, TX, and WA.

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Merissa FAQ

What weeds does Merissa control?

The Merissa label names 47 weeds, including bur (testiculate) buttercup, conical catchfly, false chamomile, chamomile mayweed, common chickweed, and plains coreopsis. Control varies by crop, rate, and timing.

What crops is Merissa labeled for?

Merissa is labeled for 8 crops and uses, including wheat, barley, sorghum, spring wheat, and winter wheat.

What is the active ingredient in Merissa? Is it a generic?

Merissa's active ingredient is metsulfuron-methyl (MOA Group 2). 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 Merissa?

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 Merissa?

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.