Phostrol Fungicide

Phostrol Fungicide
Phostrol Fungicide
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Product Overview

Phostrol Fungicide is a highly effective fungicide that provides both preventive and curative control of plant diseases. Contains an active ingredient that helps in targetting and eliminating diseases of crops. It is a phosphorus acid that is labeled as a fungicide and has a neutral pH ideal for tank mixing. The Phostrol Fungicide is a systemic fungicide that controls plant diseases such as downy mildew, pecan scab, canker, fire blight, silver scurf, late blight, Phytophthora, and storage rot diseases. It features a clear, odorless formula perfect for use on sensitive crops like cucurbits, leafy vegetables, caneberry, legume vegetables, grapes, potato, onions, tomato, tree nuts, stone fruit, and tobacco. May be applied by ground, chemigation or through air. It features a multi-site mode of action so it can be combined with other products for a more effective program component. Available in a 2.5-gallon jug.

Features and Specs

Active Ingredient Mono- and dibasic sodium, potassium, and ammonium phosphites - 53.6%
Target pests Canker, Root rot, downy mildew, Brown rot, Root and Fruit Rot, Foliar rot, Cottony leak, Heart Rot, Blister spot, Leather rot, Scab, Pink Rot, Pythium leak, late blight, Fire blight, Bacterial blight, Phytophthora, Anthracnose.
For use in Almonds, walnuts, and other nut crops, Asparagus, avocado, leafy vegetables, potatoes, tomato, onion, Blueberry, cranberry, citrus, grape, Cucurbit crops, Hop, Ginseng.
Application Make foliar applications by air or ground in sufficient water for complete coverage of the foliage. Unless otherwise specified elsewhere in this label, use a minimum of 5 gallons of water/Acre for aerial application and 20 gallons by ground.
Pet safe Yes, if used as directed on the label.
Formulation Liquid Formula.
Special Features Features clear, virtually odorless formulation.
Shipping Weight 30.90 lbs
Manufacturer Nufarm
UPC 191662011753
EPA Registration 55146-83



Apply by various application methods including foliar spray, trunk spray, soil drench, soil incorporation, root dip, and trunk injection, Make foliar applications by air or ground in sufficient water for complete coverage of the foliage. Unless otherwise specified elsewhere in this label, use a minimum of 5 gallons of water/Acre for aerial application and 20 gallons by ground.


    • Asparagus Spear slime crown rot
    • 2.5 - 5.0 pints product/A
    • Apply this product to fully expanded asparagus ferns that are beginning to senesce. Thorough coverage s required.
    • Folia and root rot
    • 4.5 pints product/A
    • Apply in 100 gallons of spraying starting when conditions first become conducive to disease development and continue on a 7-day interval as long as conditions remain favorable for disease development.
    • Note: Do not exceed 9 applications/season
    • Not registered for use in California
    • Downy mildew
    • 2.5 - 5.0 pints product/A
    • Apply in a minimum of 10 gallons of water per acre. Begin application at bud break with additional applications made throughout the season. Use higher rates depending upon disease severity and canopy density.
    • Note: Due to varietal sensitivity, test for sensitivity prior to use.
    • Downy mildew
    • 2.5 - 3.75
    • 2.5 - 5.0 pints product/A
    • Best results are obtained when this product is used in a preventative disease control program.
    • Apply the product by air, ground and/or chemigation, beginning when conditions first favor disease development. Continue applications on a 7 to 14-day interval. If the disease is already present, use the high rate and shortest spray interval.
    • Note: Do not exceed 7 applications per crop season.
    • Downy mildew
    • 2.0 - 4.0
    • 2.5 - 5.0 pints product/A
    • Apply the diluted solution to thoroughly wet foliage, Apply with normal irrigation schedule. Apply at 2 to 3- week intervals and repeat as needed.

*See label for the complete list of crops, diseases, and application rates.

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Is Phostrol Fungicide good for Edelwiess Grapes?

Have a bad fungus problem this year and need a systemic solution. Mostly for Edelweiss grape variety.


Phostrol Fungicide is used at the rate of 2.5 -5 pints per acre for grapes per the product label. It does not specify any varieties of grapes on the label for treatment, only grapes in general for application. You can use it for a variety of diseases including downy mildew which is common on grapes. 

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Will Phostrol Fungicide control pythium blight in turf type tall fescue?

Phostrol Fungicide is labeled to control pythium blight on turfgrass. You would use 4-8 oz per 1000 square feet in 1-3 gallons of water, and reapply at 14-day intervals as a broadcast spray. Applications for pythium are best applied preventatively when conditions favor disease development.

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Is Phostrol Fungicide good for pecan scab?

What fungicide rotates well with it so resistance is not built up as fast?


Phostrol Fungicide is labeled to control pecan scab as directed on the product label.  It does mention to alternate or use with other fungicide. Agri-Tin is mentioned but not a product we carry.  The active ingredient Propiconazole is commonly used to treat Pecan Scab and could be rotated with Phostrol.

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Would Phostrol Fungicide be effective for peach leaf curl?

Phostrol Fungicide is not labeled for peach leaf curl, but you may consider using Bonide Liquid Copper Fungicide Concentrate which does list peach curl on the product label.  Mix 0.5 - 2.0 fluid oz. of product per gallon of water, and apply 1.1 - 2.3 gallons of diluted spray per 1,000 sq. ft. applied as a dormant spray in late fall to before bud break, repeating application every 7 - 10 days as needed.

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How much Phostrol Fungicide will be used in a vegetable garden and sprayed with a hand sprayer?

The rate for Phostrol Fungicide will depend on what vegetable you are treating on. However, you will need anywhere between 2.5 to 5.0 pints per acre. This is equivalent to 0.4 to 0.8 oz to a gallon of water. Please refer tothe product label for complete instructions.

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