
PRESTOP WP
PRESTOP WP is a concentration of mycelium and spores from the J1446 strain of Clonostachys rosea, a fungus naturally found in soil and decomposing organic matter.
The J1446 strain was produced by researchers at Lallemand Plant Care and was isolated due to its fungicidal properties, particularly against grey mould caused by Botrytis cinerea on strawberries, tomatoes, cucumbers and peppers, against gummy stem blight of cucumbers caused by Didymella bryoniae, and also against seedling damping-off and root diseases caused by a complex of pathogenic soil fungi on vegetable crops and ornamental plants (Pythium spp., Fusarium spp., Phytophthora spp. and Rhizoctonia spp.).
Product details
- Formulation: wettable powder
- Storage: 12 months in a cool and dry place below +4°C or 4 weeks at room temperature
- APPROVAL NUMBER: 13413
Clonostachys rosea strain J1446 operates through several useful modes of action:

🎥 How does it work?
Key benefits
- Multiple properties
- Persistence: 3 to 4 weeks on foliage and 4 to 6 weeks in soil or plant substrate
- Effective protection against a wide variety of fungal diseases*:
- Grey mould and stem cankers caused by Botrytis cinerea on leafy crops, tomatoes, peppers, cucumbers, aromatic plants, ornamentals, strawberries and other soft fruits
- Gummy stem blight caused by Didymella sp. on cucumbers
- Damping-off and root or base rot diseases caused by Pythium, Phytophthora, Rhizoctonia and Fusarium on vegetables, salads, aromatic plants and ornamentals
- Environmental profile:
- Suitable for use in organic agriculture in compliance with current regulations
- No impact on beneficial organisms (pollinators, beneficial insects, etc.)
- Unclassified
- Absence of residue**
*Check the product label for authorized uses, dosages, conditions and restrictions of use.
**Active substances exempt from MRL are generally accepted in zero-residue specifications. Find out more information from your certification body.
Crop-specific benefits
| All Vegetables | Root diseases, Botrytis |
|---|---|
| Tomato, Peppers | Grey mold |
| Cucumber | Botrytis, Didymella bryoniae, Stagonosporopsis cucurbitacearum |
| Herbs | Root diseases |
| Ornamentals | Root diseases, Grey mold |
| Other crops | *Check the product label for authorized uses, dosages, conditions and restrictions of use. |
Ingredients
Spores and mycelium of Clonostachys rosea strain J1446: 2 × 10⁸ CFU*/g (320 g/kg active ingredient)
*CFU: Colony Forming Unit. Unit of measure for living microorganisms able to multiply.
Formats
| 1 kg bag |
|---|
Legal disclaimer
Product use and applications may vary depending on the country or region. Please comply with all applicable regulations. For professional use only: Handle plant protection products with care. Before use, read the label and product information carefully.


