Quest Products · fungicide
Reliant: label facts, timing, and uses
Reliant is Quest Products's Phosphorous Acid 45.8% fungicide for foliar spray and soil drench and bark spray. What it is labeled for, how it is applied, the timing, and how the PHC Rx label check reads it before a prescription goes out.
Label check
1 warningLast application was 14 days ago. Proceed with a documented override, or reschedule.
Label facts
Reliant
- Manufacturer
- Quest Products
- Active ingredient
- Phosphorous Acid 45.8%
- EPA registration no.
- Not an EPA-registered pesticide
- Category
- fungicide
- Application
- foliar spray, soil drench, bark spray
- Frequency
- Per label
- Retreatment interval
- 30 days minimum
- Protection
- About 3 months
- Time to effect
- About 7 days
Read the Reliant label (manufacturer PDF). The label is the legal document; this page is the app's copy of it.
Application months
per labelThe app does not carry a month window for this product; the pest’s treatment page sets the timing.
Labeled uses
What the label covers
Treatment guides that use Reliant
Target pests and diseases on the label (47)
Alternaria Leaf Spot · Anthracnose · Apple Scab · Armillaria Root Rot · Bacterial Blight · Bacterial Leaf Spot · Black Spot · Botryosphaeria Canker · Brown Rot · Bud Rot · Butternut Canker · Canker Diseases · Cercospora Leaf Spot · Cherry Leaf Spot · Citrus Scab · Collar Rot · Crabapple Scab · Crown Rot · Cytospora Canker · Dothistroma Needle Blight · Downy Mildew · Entomosporium Leaf Spot · Fire Blight · Fusarium · General Tree/Shrub Care · Hull Rot · Hypoxylon Canker · Leaf Blight · Leaf Spot · Nectria Canker · Needle Cast Diseases · Pecan Scab · Phomopsis Blight · Phytophthora Root Rot · Pine Pitch Canker · Pink Rot · Powdery Mildew · Pythium · Rhabdocline Needle Cast · Root Rot · Scab · Seiridium Canker · Sudden Oak Death · Swiss Needle Cast · Sycamore Anthracnose · Tar Spot · Verticillium Wilt
The label check runs this list against the host, the pest, the month, the dose, and the last application on the tree before a prescription goes out.
FAQ
Questions arborists ask
What is Reliant?
Reliant is a fungicide from Quest Products with Phosphorous Acid 45.8% as the active ingredient. It is applied by foliar spray or soil drench or bark spray.
What is the Reliant rate?
Reliant is applied at the label rate for the method and the host; the app does not carry a DBH rate table for it. Read the label linked on this page and record the rate and total on the application record.
How often can Reliant be applied?
Minimum retreatment interval 30 days. Expected protection about 3 months. Time to effect about 7 days.
What does Reliant treat?
The label lists 47 target pests or diseases. The treatment guides on this site that use it: sycamore anthracnose, apple scab, fire blight, rhizosphaera needle cast. Each guide has the rate, the timing window, and the alternatives.
Where do these numbers come from?
The PHC Rx product catalog, built from the Reliant label linked above, and synced to this page from the app. The label is the legal document; if the two disagree, the label wins and the catalog gets fixed.
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