PHOSTROL FUNGICIDE
Phostrol is a highly systemic phosphite fungicide that contains a unique blend of mono- and dibasic sodium, potassium, and ammonium phosphites, often referred to as a triple phosphite formulation. Classified as FRAC Group P07, it is designed primarily for the management of oomycete diseases such as late blight, downy mildew, Phytophthora root rot, pink rot, and Pythium. Phostrol moves throughout the plant in both the xylem and phloem, providing protection to existing and newly developing plant tissue. Its activity is twofold: it directly inhibits pathogen metabolism and also stimulates the plant’s natural defense responses, helping plants resist infection more effectively.
Key features and benefits of Phostrol include its exceptional systemic movement, flexible application timing, and compatibility with integrated disease management programs. The triple phosphite formulation improves phosphite availability within the plant, supporting consistent disease control across a wide range of crops. Phostrol is valued for its preventative activity against difficult oomycete pathogens, its ability to protect both foliage and roots, and its usefulness in both field and post-harvest disease management programs. In addition, its neutral pH makes it easy to tank mix with many crop protection products, while its dual mode of action and plant health benefits make it an effective tool for improving crop quality, reducing storage losses, and supporting resistance-management strategies.
Active Ingredient:
Mono- and dibasic sodium, potassium, and ammonium phosphites - 53.6%
Key Crops:
Potatoes, leafy vegetables, raspberries, bushberries, pome fruit, cucurbits, grapes, and more.
Key Targets:
Pink rot, late blight, early blight, silver scurf, downy mildew, pythium and phytophthora root rots
FRAC Group:
P 07
Package Size:
2 x 10L, 1000L
Features & Benefits
Effective
Phostrol provides effective preventative protection of late blight and pink rot during the season and after harvest. Three distinct phosphites are blended for improved availability to the plant.
Highly systemic - moving throughout both the xylem and phloem, Phostrol protects all parts of the plant, allowing in season foliar applications to protect foliage and tubers in the field and in storage.
Mode of action - Phostrol works directly on the disease by inhibiting the oxidative phosphorylation in the metabolism of oomycetes. In addition, Phostrol stimulates the plant’s natural defense response against pathogen attack, providing two modes of action against these tough diseases.
Globally used, locally proven: Phostrol is registered and has proven itself to be an effective fungicide in several potato growing areas around the world.
Convenient
Lower use rates offer application efficiency. Phostrol’s availability and highly concentrated blend of mono and dibasic sodium, potassium and ammonium phosphites make Phostrol effective at low use rates, which means fewer trips with the sprayer.
Phostrol has a neutral pH of 7 which means it is easy to work with, gentle on equipment, and doesn’t require a buffering agent.
Flexible
Timing – Phostrol can be applied as a foliar, in furrow, or post harvest application, providing disease protection at each stage of growth.
In-furrow – A unique mode of action for suppression of Pink Rot
Foliar – Systemic characteristics provide complete plant protection from tubers to leaf tip, throughout the growing season and into storage.
Post Harvest – Excellent protection against Pink Rot and Late Blight, and suppression of Silver Scurf while in storage.
Application Method – Phostrol offers growers flexibility in their application methods, as it can be applied by ground or aerial spraying
Tank-mix registration: A number of registered tank-mix partners have been
added to the label.
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