BioSafe Pvent Microbial WP

BioSafe PVent Microbial WP is an EPA-registered biofungicide built around 93% Gliocladium catenulatum Strain J1446, a beneficial fungus from Finnish soils. The wettable granule (WG / WP) disperses into water for drench, foliar spray, hydroponic reservoir, or cold-fog use across greenhouse, nursery, and indoor crops: pairing rhizosphere colonization, competitive exclusion, and targeted enzyme secretion against pathogenic fungi in one IPM tool with a 4-hour REI and 0-day PHI.

BioSafe PVent Microbial WP Specifications

Specifications below are sourced from the BioSafe Systems / Lallemand Plant Care product literature, the EPA-registered PVent label record, and the canonical supplier listing (cultivate_supply SKU 1000874692).

Why Choose BioSafe PVent Microbial WP

Points below are grounded in the BioSafe / Lallemand product description, the EPA registration record, and supplier listing documentation.

• Three biological modes of action in one product. PVent does not rely on a single mechanism. The 93% Gliocladium catenulatum Strain J1446 colonizes the host environment rapidly to occupy space and resources before pathogens can establish, directly competes with and attacks resilient plant pathogens, and secretes an enzyme that specifically targets pathogenic fungi. Stacking colonization, competitive exclusion, and enzymatic action in a single living biofungicide makes PVent harder for pathogens to escape than a single-mechanism product.
• One of the most concentrated EPA-registered biofungicides in its category. The 93% active-ingredient concentration is unusually high for a microbial biofungicide. EPA registration (number 64137-13-70299) means the formulation, label rates, and efficacy claims have been reviewed by federal regulators — not merely an OMRI listing or a state-only registration. For commercial growers, EPA-registered biological products simplify documentation in food-crop and certified-organic programs.
• Strain J1446 thrives across a wide temperature and humidity envelope. Strain J1446 was selected for its adaptability: it reproduces and remains active across a broad temperature and humidity range. That matters in greenhouses and indoor grow rooms where reservoir, substrate, and canopy conditions fluctuate. A microbial product that demands narrow environmental conditions to remain viable is harder to deploy than one engineered to tolerate real-world swings.
• Naturally symbiotic with the rhizosphere, stems, and foliar surfaces. Unlike biocontrols that target only the root zone or only the canopy, G. catenulatum has a documented natural symbiotic relationship with the plant rhizosphere, the stem, and foliar surfaces. The same product can be drenched into the root zone, sprayed on leaves, or fogged across a canopy and still occupy the niche it has evolved to inhabit. That is what BioSafe means when it describes PVent as a versatile IPM tool.
• 4-hour REI and zero-day pre-harvest interval. The PVent label carries a 4-hour re-entry interval and a zero-day pre-harvest interval. Crews can return to treated areas the same shift, and growers can apply right up to harvest without a withdrawal period. For high-value greenhouse crops on tight harvest cycles, those two label numbers materially change how and when a fungicide can be used.
• Wettable granule format dissolves cleanly across application methods. The wettable granule (WG / WP) formulation disperses readily in water, which means the same bag covers reservoir dosing, drench, foliar spray, and cold-fog application. Dry biological formats also tend to hold viability better than liquid concentrates in storage. A single SKU spans the methods a grow operation actually uses across propagation, vegetative, and bloom phases.
• Built by a partnership between BioSafe Systems and Lallemand Plant Care. BioSafe Systems pioneered peroxyacetic acid chemistry in agriculture and runs a Sustainable Soils Program; Lallemand Plant Care is one of the world’s largest fermentation and microbial science houses. PVent is the result of that partnership — BioSafe’s grower-facing IPM and crop-protection expertise paired with Lallemand’s fungal-fermentation capability behind Strain J1446.

Best Uses for BioSafe PVent Microbial WP

PVent is positioned for soil-borne and foliar fungal disease control across greenhouse, nursery, and indoor agricultural production. The use cases below reflect the product’s documented application methods and pathogen list.

• Soil-borne root and crown disease control. PVent is documented to suppress soil-borne pathogens including Pythium, Rhizoctonia, Fusarium, Phytophthora, Sclerotinia, Verticillium, and Plasmodiophora. Damping-off in seedlings, Pythium root rot in hydroponic crops, and Fusarium crown rot in long-cycle greenhouse crops are the canonical targets for a rhizosphere-colonizing biofungicide.
• Foliar fungal disease suppression. Applied as a spray or cold fog, PVent targets foliar pathogens including Botrytis, Alternaria, Cladosporium, Colletotrichum, Mycosphaerella, and powdery mildew. Foliar Botrytis pressure in dense canopies and gray mold on cuttings or stored crops are common reasons to add a fungal-based biocontrol to a foliar IPM rotation.
• Greenhouse and nursery crop programs. Strain J1446’s tolerance for damp, warm, and variable humidity conditions fits greenhouse and propagation-house environments where dew, irrigation cycles, and dense plantings keep disease pressure high. Preventive applications at 3–6 week intervals are the practical use pattern through the production cycle.
• Hydroponic reservoir and substrate dosing. PVent can be incorporated into hydroponic solution or substrate, making it deployable in coco, rockwool, and recirculating systems. Inoculating the substrate with a beneficial fungus competing for niche space is a foundational tactic in any biological root-zone program; PVent slots into that role alongside other root-zone products like Heavy 16 Roots on the chemistry side.
• Indoor agricultural crops with tight harvest cadence. The zero-day PHI means PVent can be sprayed or fogged on indoor crops within hours of harvest without a withdrawal period. For grows running back-to-back harvest cycles on the same room or table, having a fungicide that does not stall the harvest schedule is significant.
• Resistance-management rotations alongside conventional fungicides. PVent’s mode-of-action profile — living competitive exclusion plus enzymatic attack — differs fundamentally from synthetic chemistries. That makes it a strong rotational partner in FRAC resistance-management programs and pairs well with botanical or biostimulant products such as PureCrop1 already used in foliar IPM rotations.
• Damping-off prevention in propagation. Drench-applying PVent to plug trays and propagation substrates before or right after sticking cuttings introduces G. catenulatum to the substrate when seedling stems are most vulnerable. The same product can be carried through veg and flower without changing biocontrols mid-cycle.

PVent vs Cease & Regalia Biofungicides

Growers comparing PVent against other EPA-registered biofungicides typically weigh it against Cease (BioWorks) and Regalia (Marrone Bio Innovations). The three sit in the same shelf category but rely on different biology, so the choice depends on the niche each one occupies in an IPM program.

PVent’s distinguishing trait is fungal-on-fungal action covering both rhizosphere and foliar niches in a single SKU. The three products rotate rather than substitute: PVent for root-zone and broad-spectrum coverage, Cease for bacterial-driven foliar work, Regalia for systemic-resistance priming.

Compatibility & Operating Range

PVent is a living biological product. Compatibility extends beyond the spray tank into temperature, humidity, water chemistry, and the timing of other inputs.

• Crop and growing media: Documented for greenhouse, nursery, and indoor agricultural crops in soil, soilless mixes, coco, and inert hydroponic substrates. The rhizosphere-colonizing biology applies wherever roots have access to water and nutrients.
• Hydroponic system types: Compatible with substrate incorporation and reservoir dosing in recirculating and run-to-waste hydroponic systems. The wettable granule disperses readily and can be carried through standard irrigation lines once dissolved.
• Temperature and humidity range: Strain J1446 was selected for activity across a broad temperature and humidity envelope, which is why PVent is positioned for both warm propagation rooms and cooler bloom rooms. Standard greenhouse and indoor reservoir temperatures (65–75°F / 18–24°C) sit well inside the active range; the product also withstands freezing without degradation, simplifying off-season storage.
• Application methods that work: Soil / substrate incorporation, drench, foliar spray, hydroponic reservoir dosing, and cold fogging are all documented on the label. The same SKU spans propagation drenches, mid-cycle foliar sprays, and harvest-week canopy fogs without switching products.
• Suspension preparation: Mix the wettable granules with water to the target percentage suspension (0.05% for routine foliar / drench, 0.1% for cold fog) and apply within the same day. The brand specifies that suspensions should be prepared fresh and used within 24 hours; once mixed, the live fungus does not stay in suspension indefinitely.
• Sanitizers and oxidizers to avoid near application: Strong oxidizing sanitizers — chlorine bleach, peroxyacetic acid sanitizers, hydrogen peroxide, and high-concentration copper — will reduce or eliminate the living Gliocladium cells. Complete any sanitation, flush the lines, and then apply PVent. BioSafe’s own peroxyacetic-acid product line is best used in a separate phase of the IPM program from the biological products, not the same tank mix.
• Tank-mix partners: Compatible with most standard fertilizer programs and many biostimulants when applied at label rates and standard pH (5.8–6.5 hydro, 6.0–7.0 substrate). For a complete biological root program, pair PVent with bacterial inoculants such as Advanced Nutrients Tarantula, which targets a different microbial niche and complements rather than overlaps with G. catenulatum.
• Water source: Use clean, dechlorinated, low-chloramine water for suspension preparation. Municipal water with active chloramine residual should be filtered or treated before mixing PVent — chloramine breakdown products will reduce viability of the inoculum.
• Storage: Store the dry wettable granules in a cool, dry place out of direct sunlight. The product tolerates damp and warm conditions and survives freezing, but extremes of heat and moisture over long periods still reduce shelf life. Reseal the container tightly between uses.
• State shipping restrictions: PVent is not available in AK, CA, DC, FL, HI, IL, NE, PR, TN, and WV due to state pesticide registration limits. Confirm registration in your state before ordering.

Application Rates & Usage Guidelines

PVent is dosed by application method — foliar / drench, cold fog, or acre-rate soil drench. The rates below come from the BioSafe / Lallemand product label and brand literature.

Frequency: Routine preventive applications run every 3–6 weeks. Strain J1446 colonization plus enzyme secretion provides extended protection between applications — up to roughly four weeks following treatment — so the wider end of the interval suits low-pressure preventive programs and the tighter end suits active disease pressure.

How to Use BioSafe PVent Microbial WP

PVent is straightforward to deploy across drench, foliar, reservoir, and cold-fog use cases. The steps below cover the most common scenarios using the label-published rates.

1. Identify the application method and target. Decide whether you are running a preventive drench, treating active foliar disease pressure, fogging an entire room, or seeding a hydroponic reservoir. Each method has a distinct rate — cross-check against the dosing table above before measuring.
2. Confirm state registration and personal protective equipment. Verify PVent is registered in your state (not available in AK, CA, DC, FL, HI, IL, NE, PR, TN, WV). Wear label-required PPE for handling biological wettable powders: long sleeves, gloves, eye protection, and a dust mask while measuring dry granules.
3. Prepare clean, dechlorinated water. Use cool to lukewarm water, filtered or otherwise free of active chlorine or chloramine residual. Strong oxidizers reduce viability of the inoculum.
4. Measure the wettable granules to target concentration. For routine foliar or drench work, weigh 0.33 oz per 5 gallons of water (0.05% suspension). For cold fog, weigh 0.13 oz per gallon (0.1% suspension). For acre-rate soil drench, calculate at 0.45–0.90 lb per acre based on disease pressure.
5. Mix into water with agitation. Add the granules to water with the agitator, pump, or air stone running. Allow the suspension to fully disperse before charging the spray system or circulating through the reservoir. Carrier residue can occasionally settle — keep agitation continuous through application.
6. Apply via the chosen method. For foliar spray, cover the upper and lower leaf surfaces to runoff. For drench, saturate the rootzone evenly. For reservoir dosing, circulate through the irrigation lines. For cold fogging, apply 0.6–1.0 gallon of 0.1% suspension per 10,000 sq ft of crop area, working across the room evenly.
7. Use the suspension within the same day. Mix only what you will apply that shift — the brand specifies that PVent suspension should be prepared fresh and used within 1 day. Do not store mixed suspension overnight.
8. Repeat at 3–6 week intervals. Run the program preventively every 3–6 weeks. Tighten the interval under active disease pressure; loosen it for low-pressure maintenance. PVent’s protection extends roughly four weeks past application.
9. Observe the 4-hour REI. Keep crews and visitors out of treated areas for 4 hours after application. The zero-day PHI means harvest can proceed once the REI clears.
10. Resume the standard fertigation program. Once PVent is applied, return to your normal base feed and additive schedule. Avoid layering PVent in the same tank with strong oxidizers, copper-based products, or peroxide sanitizers; rotate those into a separate phase of the program.
11. Store the unused product correctly. Reseal the bag tightly. Store cool, dry, and out of direct sunlight. PVent tolerates damp and warm conditions and survives freezing, but proper storage extends viable shelf life.

Sources & Further Reading