Prime Source Chlorothalonil 720 Select Fungicide

5 out of 5 stars 2 Reviews | 11 Q&A

Prime Source Chlorothalonil 720 Select Fungicide

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5 out of 5 stars Rating: 5

2 Reviews | 11 Q&A

Product Overview

Prime Source's Chlorothalonil 720 Select Fungicide is a distinguished disease control agent for a wide variety of plant diseases. It offers a contact, preventive, and multi-site mode of action to impede or stop the increase of resistance to single-site fungicides. Chlorothalonil 720 fungicide features an easy-to-use liquid formulation and has natural adhesion to the plant surface. It is labeled for use on cool and warm season landscape ornamentals, conifers, and turfgrasses. It effectively obstructs algae, anthracnose, brown patch, dollar spot, fusarium, leaf spot, rust and more.

This is an economical replacement for Daconil WeatherStik.

Features and Specs

Active Ingredient Chlorothalonil 54%
Target pests Dollar Spot, Brown Patch, Algae, Leaf Spot, Anthracnose, Fusarium, Rust and others
* See label for complete list
For use in Cool and Warm Season Turf-grasses, Conifers and Landscape Ornamentals
* 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
* See label for complete list
Application * See label for complete application instructions
Pet safe Yes, if used as directed on Label (Toxic to aquatic invertebrates and wildlife)
Yield Tree crops: 1 acre (1.5 to 5.5 pints)
Sodfarm grass: 1 acre ( 5.5 to 15.0 pints)
Golf course fairways: 1 acre (5.5 - 15.0 pints)
Golf course tees and greens: 1000 sq ft. (2.0 - 5.5 fl oz.)
Formulation Professional Product
Group M5 Fungicide
Shipping Weight 29.40 lbs
Manufacturer Prime Source
EPA Registration 89442-9


Diseases Controlled:

Actinopelte leaf spot, Algal scum, Alternaria leaf spot or leaf blight, Anthracnose, Anthracnose Blights, Black spot (Diplocarpon), Botrytis blights, Botrytis flower spot, flower blight, Brown blight, Brown patch, Cephalosporium leafspot, Cercospora leafspot, Cerosporidium leafspot, Copper spot, Corynespora stem and leaf spots, Curvularia flower spot, Curvularia leafspot, Cylindrocladium stem canker, Dactylaria leafspot, Dichondra leaf spot, Didymellina leafspot, Dollar spot, Drechslera (Bipolaris) leafspots, Erysiphe cichoracearum (powdery mildew) Microsphaera spp., Fabraea (Entomosporium) leafspot, Fusarium (Gibberella) leafspot, Fusarium (Microdochium) Patch, Gloeosporium black leafspot, Gray Snow Mold, Gray leaf spot, Gymnosporangium spp. (rust) Puccinia spp., Inkspot, Leaf spot, Marssonina leafspot, Melting Out, Monilinia blossom blight, Mycosphaerella ray blight, Myrothecium leafspot, brown rot, Ovulinia flower blight, Phyllosticta leafspot, Phytophthora leaf blight, dieback, Pucciniastrum hydrangeae (rust) Puccinia spp., Ramularia leafspot, Red thread, Rhizoctonia web blight, Rhizopus blossom blight, Scab (Venturia), Sclerotinia flower blight, Septoria leafspot, Shothole (Stigmina), Sphaeropsis leafspot, Sphaerotheca fuliginea (powdery mildew) Microsphaera spp., Stagonospora leaf scorch, Stem rust (bluegrass), Tan leafspot (Curvularia), Taphrina blister, Twig blight, Volutella leaf blight

Application Rates:

  • Tree crops: 1.5 - 5.5 pints/acre
  • Sodfarm grass: 5.5 - 15.0 pints/acre
  • Golf course fairways: 5.5 - 15.0 pints/acre
  • Golf course tees and greens: 2.0 - 5.5 fl oz/1000 sq ft.

General Precautions and Restrictions

Do not apply this product within 150 feet (for aerial and air-blast application); or 25 feet (for ground applications) from marine/estuarine water bodies unless there is an untreated buffer area of that width between the area to be treated and the water body.

Avoiding spray drift at the application site is the responsibility of the applicator. The interaction of many equipment-and-weather related factors determine the potential for spray drift. The applicator and the grower are responsible for considering all these factors when making decisions. The following drift management requirements must be followed to avoid off-target drift movement from aerial applications to agricultural field crops. These requirements do not apply to forestry applications, public health uses or to applications using dry formulations.

  1. The distance of the outer most nozzles on the boom must not exceed 3/4 the length of the wingspan or rotor.
  2. Nozzles must always point backward parallel with the air stream and never be pointed downwards more than 45 degrees.

Mixing, Loading, and Applying

Chlorothalonil 720 Select is intended to be diluted into water, then applied to crops by typical agricultural spraying techniques.


Spray volume to be used will vary with crop and amount of plant growth. Spray volume should normally range from 20 to 150 gallons per acre (200 to 1400 liters per hectare) for dilute sprays and 5 to 10 gallons per acre (50 to 100 liters per hectare) for concentrate ground sprays and aircraft applications. Both ground and aircraft methods of application are recommended unless specific directions are given for a crop.

Slowly invert container several times to assure uniform mixture. Measure the required amount of Chlorothalonil 720 Select and pour into the spray tank during filling. Keep agitator running when filling spray tank and during spray operations.

Do not use on greenhouse-grown crops except as directed in the Ornamental Plants section of this label.

Tank Mixing

When tank mixing this product with other pesticides, observe the more restrictive label limitations and precautions. No label dosage rates should be exceeded. This product cannot be mixed with any product containing a label prohibition against such mixing.

Chlorothalonil 720 Select can be tank mixed with ActinoGrow (Streptomyces lydicusWYEC 108) for the control of diseases in soybeans as specified on both this and the Actino-Grow label (see the Application Rate Table for details). Observe all applicable directions,precautions, and limitations on the Chlorothalonil 720 Select and ActinoGrow label (EPA Reg. No. 73314-1) when applying these products. Do not combine Chlorothalonil 720 Select in a sprayer tank with pesticides, surfactants or fertilizers, unless your prior use has shown the combination physically compatible, effective and noninjurious under your conditions of use. Do not combine this product with Dipel 4F, Foil, Triton AG-98, Triton B-1956 or Latron B-1956, as phytotoxicity may result from the combination when applied to the crops on this label. DO NOT tank mix this product with oil, or with any adjuvants which contain oil as their principal ingredient. When an adjuvant is to be used with this product, Prime Source LLC recommends the use of a Chemical Producers and Distributors Association (CPDA) certified adjuvant. Do not use with Copper-Count N in concentrated spray suspensions.

Applications Through Sprinkler Irrigation Systems (Chemigation)

Application through sprinkler irrigation systems is recommended only for those specific crops for which the notation “chemigation OK” is listed on label.

Refer to Product Label for complete list of target diseases, specific directions for use and additional precautionary statements.

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  • 5 of 5 Stars

    Chlorothalonil 720 for lawn disease control

    By Richard on 08/14/2015

    This is an excellent product for me to fight "dollar spot" in my lawn. I have to use it every week during the growing season and it is very effective

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    12 of 13 people found this review helpful

  • 5 of 5 Stars

    Great product, great service!

    By James on 07/31/2020

    This is a great product for fungus control Do My Own provides very fast service like always.

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See all 2 customer reviews

Questions & Answers

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What is the shelf life of Prime Source Chlorothalonil 720 Select?

The shelf life of Prime Source Chlorothalonil 720 Select is 3-5 years from the date of purchase if stored at room temperature. 

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10 of 10 people found this answer helpful

Will Prime Source Chlorothalonil 720 Select cure rhizosphaera in blue spruce trees?

Prime Source Chlorothalonil 720 Select is labeled for rhizosphaera but is usually not recommended. Most Chlorothalonil based products are actually specifically labeled against use on blue spruce because they turn the trees a very unsightly white color. This is unfortunate since most online articles and local master gardeners point you specifically to Chlorothalonil based products. Because none of the products are actually labeled for blue spruce we cannot recommend you use them on these trees. If you do choose to use one, we highly recommend you choose a product that lists rhizosphaera as a disease it treats on the label. We apologize we could not be more helpful! &view=grid

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9 of 10 people found this answer helpful

How many gallons of water per 1,000 square feet when using Prime Source Chlorothalonil 720 Select Leaf Spot on turf?

Prime Source Chlorothalonil 720 Select is not labeled to be used on home lawns. Armada 50 is a great product to treat leaf spot in residential turf.  You should rotate to a different class fungicide after 2 uses of the Armada.  Clearys 3336F would be a great rotation partner to the Armada. The rates for each product will differe based on preventative or curative rates.  You can view the Armada label and the Clearys label for rate information.  

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3 of 3 people found this answer helpful

Can I mix Prime Source Chlorothalonil 720 Select with Talstar and NyGuard?

Is it permissible to mix: Prime Source Chlorothalonil 720 Select, NyGuard IGR, and Talstar P without harming their individual effect?


Yes, you can mix Prime Source Chlorothalonil 720 Select, Talstar P and NyGuard IGR. You have to do a tank test first, to make sure they're compatible, follow the products' label instructions, and stick to the most restrictive label.

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2 of 2 people found this answer helpful

Can Prime Source Chlorothalonil 720 Select be used on tomatoes?

Prime Source Chlorothalonil 720 Select is labeled for fruiting vegetables with the exception of tomatoes. You can look at using Garden Tech Daconil Fungicide Concentrate. It can be applied directly to tomatoes or other fruits, vegetables, trees, and ornamentals.  

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2 of 2 people found this answer helpful

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