BotryStop WP Fungicide - 12lb - OMRI Listed

Biological Site Competition Against Gray Mold, 12lb

Once Botrytis cinerea has colonized a blossom or wound site, a fungicide applied afterward is fighting an infection already underway rather than preventing one. BotryStop WP takes the opposite approach, using the fungal biocontrol organism Ulocladium oudemansii strain U3 to occupy those same infection-prone sites first, competitively excluding Botrytis before it can take hold.

This 12lb wettable powder covers a full season of preventive applications for greenhouse, berry, and ornamental operations running Botrytis on a rotation schedule.

Key Features & Benefits

• Biological mode of action — Ulocladium oudemansii colonizes wound sites, senescing tissue, and blossom surfaces, displacing Botrytis before infection develops.
• Controls three pathogens — suppresses Botrytis cinerea (gray mold), Sclerotinia sclerotiorum (white mold/stem rot), and Monilinia spp. (brown rot).
• Resistance management tool — its biological mode of action makes it a useful rotation partner alongside conventional Botrytis fungicides.
• OMRI Listed — approved for certified organic production.
• 4-hour REI — a comparatively short re-entry interval for crews cycling through greenhouse or field blocks.

Who Should Use This

Greenhouse producers, berry growers, and ornamental operations managing Botrytis pressure in high-humidity environments — particularly cut flower, strawberry, grape, and high-value vegetable programs concerned about fungicide resistance — are the direct fit for this 12lb size.

About BioWorks

BioWorks, founded in 1993 in Victor, New York from biological control patents originally developed at Cornell University, manufactures BotryStop WP as part of its biological disease control product line.

Frequently Asked Questions

How does BotryStop WP work against Botrytis?

BotryStop WP contains Ulocladium oudemansii, a naturally occurring fungal biocontrol agent that colonizes wound sites, senescing tissue, and blossom surfaces before Botrytis can infect. By occupying those infection-prone sites first, it prevents Botrytis spores from establishing.

Should BotryStop WP be applied preventively or after symptoms appear?

BotryStop WP works best as a preventive application made before Botrytis infection occurs, since it needs to colonize plant surfaces ahead of the pathogen. Begin applications before conditions favorable for Botrytis develop, such as cool, humid weather or dense canopies, and continue on a regular schedule.

What other diseases does BotryStop WP control besides Botrytis?

In addition to Botrytis cinerea, BotryStop WP controls Sclerotinia sclerotiorum and Monilinia spp. Coverage details and rates for each disease are listed on the current product label.

Is BotryStop WP approved for organic production?

Yes, BotryStop WP is OMRI Listed for use in certified organic production. Confirm current approval with your certifying agency before use.

Can BotryStop WP be tank mixed with other fungicides?

Avoid tank mixing with fungicides that have broad antimicrobial activity, since that can reduce the viability of the biocontrol organism. Always read and follow the current product label before combining products.