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
- Chromobacterium subtsugae strain PRAA4-1T (cells and spent fermentation media)
- Chemical class
- Microbial insecticide made from bacterial cells and their spent fermentation media. Potency is listed as at least 1,000 cabbage looper killing units per milligram.[1]
- Mode of action
- Bacterial stomach poison that also cuts egg laying and deters feeding; Chromobacterium is not named in the IRAC classification[1]
- Signal word
- Grandevo WDG (MBI-203 WDG; also Grandevo NXT and Grandevo CG): Caution[1]
More than a stomach poison
Caterpillars and certain beetles are killed mainly by eating it. On aphids, psyllids, whiteflies, Lygus bugs, mealybugs, thrips and plant-feeding mites, the label adds lower egg laying and feeding deterrence.[1]
Professional uses on the same label
The agricultural sublabel adds field crops, greenhouses, nurseries, turf, poultry houses and nematode suppression, with a 4-hour restricted-entry interval for workers.[1]
Where it is used
Spray before pests reach damaging numbers or as soon as you see eggs being laid. Don't let mixed spray sit overnight.[1]
Test a few leaves first and check back in 2 to 4 days for burning, browning or distortion. Visible spray deposits can show on some light-colored flowers.[1]
For grubs, pre-water dry turf with thatch, then irrigate after spraying. Thatch should be no deeper than half an inch.[1]
For seed maggots, wireworms, cutworms and white grubs in garden beds, drench 3 tablespoons per gallon into the seed furrow at 1 quart per 25 feet of row, or 4 fl oz per plant.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Grandevo WDG (MBI-203 WDG; also Grandevo NXT and Grandevo CG)[1] | Pro Farm Group, Inc. | 84059-27 | 30.0% | water dispersible granule | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Grandevo WDG (MBI-203 WDG; also Grandevo NXT and Grandevo CG) | Vegetables, fruit, nuts, ornamentals, trees, shrubs and flowers (home and garden) | Aphids, mites, whiteflies, thrips, mealybugs, scales, loopers, armyworms, hornworms, tent caterpillars, stink bugs, adult Japanese beetles | 2 tbsp product per gallon of water[1] For a 32 fl oz dial hose-end sprayer, add 8 tablespoons, fill with water, and set the dial to 8 oz of concentrate per gallon. |
| Grandevo WDG (MBI-203 WDG; also Grandevo NXT and Grandevo CG) | Lawns and turf | Webworms, cutworms, chinch bug, leafhoppers | 6 tbsp product per gallon of water[1] Spray 1 gallon of mix per 250 square feet. Don't water it in for these surface pests. |
| Grandevo WDG (MBI-203 WDG; also Grandevo NXT and Grandevo CG) | Lawns and turf | White grubs (including green June beetle, May or June beetles, masked chafers, Oriental beetle) and annual bluegrass weevil | 8 oz product per gallon of water[1] That's 1/2 lb per gallon over 250 square feet, irrigated afterward to moisten the top inch of soil. Aim for first- and second-instar grubs. |
| Grandevo WDG (MBI-203 WDG; also Grandevo NXT and Grandevo CG) | Outdoor areas around the home where the insects gather | Boxelder bug, brown marmorated stink bug | 1 lb product per 12 gallons of water[1] The label aims this at the fall, when these insects look for indoor places to overwinter. |
Safety and environmental hazards
People
Signal word CAUTION: causes moderate eye irritation. Avoid contact with eyes or clothing, and wash with soap and water after handling.[1]
Pets
The label's hazard statement for humans and domestic animals is moderate eye irritation. Store it in a cool, dry place and never pour leftover product down a drain.[1]
Bees and pollinators
Toxic to bees exposed to direct treatment or to residues on blooming plants or weeds. Don't apply while bees are visiting the area.[1]
Fish and water
Toxic to aquatic invertebrates, and drift or runoff may harm aquatic life next to treated areas. It is also toxic to certain nontarget land arthropods.[1]
Common questions
- How much Grandevo per gallon?
- For home garden foliar sprays, 2 tablespoons per gallon of water. Turf insects take 6 tablespoons, and grubs take half a pound per gallon.[1]
- Does Grandevo work on stink bugs?
- Its home label lists stink bugs on plants, and it has outdoor directions for brown marmorated stink bug and boxelder bug at 1 lb per 12 gallons of water.[1]
- Is Grandevo safe for bees?
- No. The label says it is toxic to bees exposed to direct treatment or residues on blooming plants, so don't spray while bees are visiting.[1]
Sources
- U.S. EPA Pesticide Product Label System, “MBI-203 WDG (Grandevo WDG) master label label, EPA Reg. No. 84059-27 (EPA-stamped, Sept. 19, 2024).” www3.epa.gov/pesticides/chem_search/ppls/084059-00027-20240919.pdf (accessed 2026-10-06)