The label is the law. Rates and restrictions below are taken from the product labels listed under Sources. Your product's own label governs; read it before you mix or apply. Mixing calculator · Disclaimer
- Active ingredient
- Terpene constituents of the extract of Chenopodium ambrosioides near ambrosioides
- Chemical class
- Botanical essence; IRAC Group UNE, botanicals with an unknown or uncertain mode of action.[2]
- Mode of action
- IRAC Group UNE: Botanical essence including synthetic, extracts and unrefined oils with unknown or uncertain mode of action[2]
- Signal word
- Requiem EC (QRD 452; also sold as Metronome EC for ornamentals): Caution[1]
Two brand names, one registration
EPA Reg. No. 264-1159 has two sub-labels. Requiem EC covers food crops from asparagus to tree nuts, while Metronome EC covers field and container-grown non-food ornamentals in commercial nurseries, greenhouses and shade houses.[1]
Metronome EC has occasionally injured the flowers of cyclamen, gerbera, begonia and impatiens, so the label rules out spraying those plants while in bloom.[1]
Where it is used
It kills on contact only, so thorough coverage decides the result. Use enough spray volume and the right nozzles to reach every infested leaf surface.[1]
Start early in the pest cycle, before insects reach damaging levels. Raise the rate for heavy populations or large plant canopies.[1]
Test it on a small area of any new crop first. Never use it in a program with captan, and keep chlorothalonil sprays well separated, because both pairings can injure plants.[1]
Requiem EC can go on up to the day of harvest, but workers stay out of treated areas for 4 hours. Wait 2 hours before releasing beneficial insects.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Requiem EC (QRD 452; also sold as Metronome EC for ornamentals)[1] | Bayer CropScience LP | 264-1159 | 16.75% | emulsifiable concentrate | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Requiem EC (QRD 452; also sold as Metronome EC for ornamentals) | Vegetables, berries, tree fruit, citrus, tree nuts, grapes, herbs, hops, cotton and other labeled crops | Aphids, thrips, whiteflies, mites, leafhoppers, scale, leafrollers and other listed pests (leafminers suppressed on some crops) | 0.5–4 qt product per acre[1] Most crop tables call for 2 to 4 quarts per acre, lower for light infestations or small plants and higher for heavy pressure or big canopies. Ground sprays may be no stronger than 2% product by volume. |
| Requiem EC (QRD 452; also sold as Metronome EC for ornamentals) | Non-food ornamental trees, shrubs, flowers and bedding plants in commercial nurseries and greenhouses | Aphids, plant-feeding mites, whiteflies, mealybugs, leafminers, thrips, fungus gnats, tarnished plant bugs | 0.65–1.3 fl oz product per gallon of water[1] That is a 0.5% to 1% solution. Spray at the first sign of pests on a 7- to 14-day schedule, covering both upper and lower leaf surfaces, no more than 10 times a year. |
Safety and environmental hazards
People
Signal word CAUTION. Avoid contact with skin, eyes and clothing, since prolonged or frequently repeated skin contact may cause allergic reactions in some people. Handlers wear gloves and eyewear, plus an organic-vapor respirator in greenhouses.[1]
Pets
The hazard statement covers people and domestic animals alike. The label is for farms, nurseries and greenhouses only and is not for residential use.[1]
Bees and pollinators
The label carries no bee hazard statement. It lists lady beetles, lacewings, predatory mites and several parasitic wasps as compatible biological control agents.[1]
Fish and water
Toxic to aquatic invertebrates. Ground and air-blast sprays need a 15-foot buffer from water, aerial sprays need 400 feet, and nothing goes on if rain is expected within 2 hours.[1]
Common questions
- Is Requiem EC organic or natural?
- Its active ingredient is a synthetically manufactured version of terpene compounds found in a Chenopodium ambrosioides plant extract. The label itself does not make an organic claim.[1]
- Can homeowners use Requiem on a vegetable garden?
- No. Both sub-labels are marked not for residential use; it is meant for agricultural crops and commercial nurseries and greenhouses.[1]
- How often can Requiem EC be sprayed?
- No more than 10 times per crop production cycle on food crops, and no more than 10 times a year on ornamentals.[1]
Sources
- U.S. EPA Pesticide Product Label System, “QRD 452 (Requiem EC, Metronome EC) label, EPA Reg. No. 264-1159 (EPA-stamped, Apr. 30, 2014).” www3.epa.gov/pesticides/chem_search/ppls/000264-01159-20140430.pdf (accessed 2026-10-06)
- Insecticide Resistance Action Committee, “IRAC Mode of Action Classification Scheme, Version 11.5 (Feb. 2026).” irac-online.org/documents/moa-classification/ (accessed 2026-10-06)