Prime Source Chlorothalonil 82.5 DF

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Product Name Price/Ea. Quantity
Prime Source Chlorothalonil 82.5 DF
Prime Source Chlorothalonil 82.5 DF
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Chlorothalonil 82.5 DF is a broad spectrum turf and ornamental fungicide that features preventative disease protection with multi-site activity. As a result, Chlorothalonil 82.5 DF can be used repeatedly with little risk of resistance. Chlorothalonil 82.5 DF is a broad spectrum turf and ornamental fungicide that features preventative disease protection with multi-site activity. As a result, Chlorothalonil 82.5 DF can be used repeatedly with little risk of resistance

Product Information

Chlorothalonil 82.5 DF Select Fungicide

Chlorothalonil 82.5 DF is Chlorothalonil 82.5% in a dry flowable formulation is a broad spectrum fungicide. Compare to Daconil Ultrex, with the same formulation. Chlorothalonil 82.5 DF treats a wide range of major turf and ornamental diseases including anthracnose, brown batch, leaf spots, copper spot, and more listed diseases.

Fungicide Resistance Management

Chlorothalonil 82.5DF Select is effective for strategic use in programs that attempt to minimize disease resistance to fungicides. Some other fungicides which are at risk from disease resistance exhibit a single-site mode of fungicidal action. This product, with a multi-site mode of action, may be used to delay or prevent the development of resistance to single-site fungicides.

Features and Benefits

  • Broad spectrum, long-residual contact fungicide
  • Labeled for use on cool and warm season turfgrasses
  • Labeled for conifers and landscape ornamentals
  • Natural adhesion to plant surface
  • No resistance issues
  • Easy to use liquid formulation
  • Sales Brochure


Chlorothalonil 82.5 DF Select is intended to be diluted with water and then applied to crops by typical agricultural spraying techniques. Apply Chlorothalonil 82.5 DF Select with enough water for a uniform coverage; 20-150 gallons per acre for diluted sprays and 5-10 gallons for concentrated ground and aircraft sprays. The amount of water will vary with crop and amount of plant growth.

Interval of
Golf Course
Greens & Tees
(Rate/1,000 sq. ft.)
Golf Course Fairways,
Lawns & Other Turfgrass**
Rate per acre
  • Dollar spot
  • Brown Patch
  • Leaf spot, Melting Out, Brown blight
  • Gray leaf spot
7-14 days 1.82 to 3.25 ounces
(4.1 to 7.3 lbs. a.i./acre)
5 to 8.9 pounds
(4.1 to 7.3 lbs. a.i./acre)
  • Red Thread
  • Anthracnose
  • Copper spot
  • Stem rust
  • Dichondra leaf spot

 7-14 days


3.25 ounces


5 ounces

(7.3 or 11.3 lbs. ai/acre)

8.9 pounds

or 13.7 pounds

(7.3 or 11.3 lbs ai/acre)

*Diseases listed are caused by fungi, some of which are named below:

  1. Dollar spot: Sclerotinia homeocarpa; Lanzia or Moellerodiscus spp.
  2. Brown patch: Rhizoctonia solani, R. zeae, R. cerealis
  3. Leaf spots, Melting-out, Brown blight: Drechslera spp. (including D. poae, D. siccans), Bipolaris sorokiniana, Curvularia spp.
  4. Gray leafspot; Pyricularia grisea, P. Oryzae
  5. Red Thread: Laetisaria fuciformis
  6. Anthracnose: Colletrotrichum graminicola
  7. Copper spot: Gloeocercospora sorghi
  8. Stem rust: Puccinia graminis
  9. Dichondra leafspot: Alternaria spp.

**Does not include sodfarms.

Ornamental Plants

Apply 1.25 pounds per 100 gallons of water for most ornamentals (see product label. Spray enough finished solution for an adequate coverage of plant parts; about 20-150 gallons per acre. Repeat every 7-14 days, until conditions are no longer favorable for disease.

Packaging 5 lb bag
Product Label Label
More PDF's N/A
Target Pest

Turf Diseases Include:

  • Algae
  • Anthracnose
  • Brown Blight
  • Brown Patch
  • Copper Spot
  • Dichondra Leafspot
  • Dollar Spot
  • Fusarium
  • Gray Leafspot
  • Gray Snow Mold
  • Leaf Spot
  • Melting Out
  • Red Thread
  • Rust
  • Stem Rust

Ornamental Diseases Controlled Include:

  • Flower Spots
  • Leaf Spots
  • Flower Blights
  • Foliar Blights
Active Ingredient (s) Chlorothalonil...82.5%
For Use :
  • Golf Courses
  • Ornamentals
  • Turfgrasses: Do not use on home lawns and turf sites associated with apartment buildings, daycare centers, playgrounds, recreational park athletic fields, athletic fields located on or next to schools (i.e., elementary, middle, and high schools), campgrounds, churches, and theme parks.
Yield N/A
Mixture|Application N/A
Shipping Restrictions AK

Frequently Asked Questions


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