Prime Source Propiconazole 14.3 Select Fungicide

4.5 out of 5 stars 23 Reviews | 21 Q&A

Prime Source Propiconazole 14.3 Select Fungicide
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Average Rating

4.5 out of 5 stars Rating: 4.5

23 Reviews | 21 Q&A

Product Overview

Prime Source's Propiconazole 14.3 Fungicide provides curative and preventative control of numerous ornamental and turfgrass diseases. Propiconazole 14.3 Select prevents the incorporation of ergosterol into the growing fungal cell membranes. Without ergosterol, the fungal cellular growth is stopped. By disrupting fungal growth at the earliest possible stage, the impact and effects of the disease is minimized. Propiconazole is a broad spectrum product and works to control over 18 turf diseases.

  • Excellent residual control
  • Low use rates
  • Low odor formulation
  • High tank mix compatibility
  • Labeled for both Turf & Ornamental applications
  • Both foliar and systemic properties

Propiconazole 14.3 Select is a systemic fungicide that will help control turf and ornamental diseases such as  dollar spot, brown patch, anthracnose, powdery mildew, summer patch, gray leafspot, zoysia patch, and more. It contains 14.3% Propiconazole as its active ingredient and it provides preventive and curative control of plant fungal diseases. It works by stopping fungal growth at an early stage so the effect of the disease will be reduced. This liquid formulation guarantees to deliver excellent residual control with low use rates. It can be used on golf courses, commercial lawns, residential lawns, landscape ornamentals, and nurseries.

Features and Specs

Active Ingredient Propiconazole 14.3%
Target pests Dollar spot, brown patch, anthracnose, red thread, pink patch, rust, powdery mildew, stripe smut, summer patch, gray leafspot, zoysia patch, and more. (Other diseases controlled can be found on label)
For use in Golf course, commercial lawns, residential lawns, landscape ornamentals, and nursery
Application Application Rates: Turfgrass: 0.5 - 4.0 fl oz/1000 sq ft
Ornamentals: 2.0 - 24.0 fl oz/100 gallons
(Refer to product label for specific rates and use instructions)
Pet safe Yes, if used as directed on Label
Formulation Professional Product
Group 3 Fungicide
NY (Restricted To Licensed Applicators Only)
Shelf Life 3 years
Special Features Excellent residual control with low use rates
Shipping Weight 1.21 lbs
Manufacturer Prime Source
UPC 653341841292
EPA Registration 89442-17


PROPICONAZOLE 14.3 SELECT is a systemic fungicide for use on turfgrasses for the control of dollar spot (Sclerotinia homoeocarpa), brown patch (Rhizoctonia solani), anthracnose (Colletotrichum graminicola), red thread (Laetisaria fuciformis), pink patch (Limonomy-ces roseipellis), rust (Puccinia graminis), powdery mildew (Erysiphe graminis), stripe smut (Ustilago striiformis and Urocystis agropyri), summer patch (Magnaporthe poae), necrotic ring spot (Leptosphaeria korrae), spring dead spot (Leptosphaeria korrae, Leptosphaeria narmari, Ophiosphaerella herpotricha, Gaeumannomyces graminis), take-all patch (Gaeumannomyces graminis), leafspot (Bipolaris spp., Drechslera spp.), gray leafspot (Pyricularia grisea), pink snowmold (Microdochium nivale), Fusarium patch (Fusarium nivale), gray snowmold (Typhula spp.), yellow patch (Rhizoctonia cerealis), and zoysia patch (Rhizoctonia solani).

PROPICONAZOLE 14.3 SELECT also controls numerous diseases on ornamentals and other landscape and nursery plantings. It controls powdery mildews, rusts, leafspots, scabs, and blights. Refer to the appropriate section for specified diseases and plants.


Fill the spray tank 1/2 to 3/4 full with water. Add the proper amount of Propiconazole Select and then add the rest of the water. Provide sufficient agitation during mixing and application to maintain a uniform emulsion. If Propiconazole 14.3 Select is tank mixed with other products, use the following sequence:

  1. Always check the compatibility of the tank mix using a jar test with proportionate amounts of Propiconazole 14.3 Select, other chemicals to be used, and the water, before mixing in the spray tank.
  2. Provide sufficient jet or mechanical agitation during filling and application to keep the tank mix uniformly suspended.
  3. Fill tank at least 1/2 full of clean water.
  4. Add wettable powders to the tank first, allowing them to completely suspend in the tank before proceeding. This process can be hastened by premixing the product in water before adding to the tank.
  5. Add flowables or suspensions next.
  6. Add Propiconazole 14.3 Select next.
  7. Add emulsifiable concentrates last.
  8. Do not leave tank mix combinations in the spray tank for prolonged periods without agitation. Mix and apply them the same day.


For broader spectrum control, Propiconazole 14.3 Select can be tank mixed with other fungicides. For example, Subdue may be tank mixed with Propiconazole 14.3 Select or used alone when conditions are favorable for Pythium blight. Propiconazole 14.3 Select is also compatible with numerous herbicides and insecticides.

Check compatibility before tank mixing. Add Unite (3 pts. per 100 gals.) to tank mixes which are incompatible. Follow the directions under MIXING INSTRUCTIONS for tank mixes. Observe all directions, precautions, and limitations on labeling of all products used in tank mixes. Tank mixtures or other applications of products referenced on this label are permitted only in those states in which the referenced products are registered.


A variety of factors including weather conditions (e.g., wind direction, wind speed, temperature, and relative humidity) and method of application can influence pesticide drift. The applicator must evaluate all factors and make appropriate adjustments when applying this product.

Wind Speed- Do not apply at wind speeds greater than 15 mph.

Droplet size- Apply as a medium or coarser spray (ASAE Standard 572).

Temperature Inversions- If applying at wind speeds less than 3 mph, the applicator must determine if a) conditions of temperature inversion exist, or b) stable atmospheric conditions exist at or below nozzle height. Do not make applications into areas of temperature inversions or stable atmospheric conditions.

Additional requirements for aerial applications:

  1. The boom length must not exceed 75% of the wingspan or 90% of the rotor blade diameter.
  2. Release spray at the lowest height consistent with efficacy and flight safety. Do not release spray at a height greater than 10 feet above the crop canopy unless a greater height is required for aircraft safety.
  3. When applications are made with a crosswind, the swath must be displaced downwind. The applicator must compensate for this displacement at the up and downwind edge of the application area by adjusting the path of the aircraft upwind.


  1. Use PROPICONAZOLE 14.3 SELECT in a preventive disease control program.
  2. Apply in sufficient water to ensure thorough coverage.
  3. Apply after mowing OR allow sprayed area to completely dry before mowing.
  4. For control of foliar diseases, allow sprayed area to completely dry before irrigation.
  5. For control of soil-borne diseases, Propiconazole Select can be watered in after application.
  6. Under conditions optimum for high disease pressure, use the higher rate and the shorter interval.
  7. For optimum turf quality and disease control, use Propiconazole 14.3 Select in conjunction with turf management practices that promote good plant health and optimum disease control.
  8. Evaluate spray additives prior to use. Label directions are based on data obtained with no additives.
  9. Before use of any fungicide, proper diagnosis of the organism causing the disease is important. Use of diagnostic kits or other means of identification of the disease organism is essential to determine the best control measures.
  10. Do not apply more than 16 fl. oz. per 1,000 ft. 2/calendar year nor apply more than 5.4 gallons of product per acre per calendar year.
  11. Do not graze animals on treated areas. Do not feed clippings from treated areas to livestock or poultry.
  12. Bermuda grass can be sensitive to Propiconazole 14.3 Select. Do not exceed 4 fl. oz. per 1,000 sq. ft. every 30 days on any variety of Bermuda grass. In Florida, do not apply Propiconazole Select to Bermuda grass golf course greens when temperatures exceed 90F.

See label for complete list of diseases controlled and application instructions.

5 stars   16
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3 stars   1
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1 star   1
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  • 5 of 5 Stars

    skeptical no more...

    By Rob on 04/19/2019

    I've had "brown patch" invading my lawn for many weeks. I hired a professional lawn service to treat the area but the fungus growth continued. After spending $300 with the lawn service, I thought I would try to treat it myself using the propiconazole 14.3. I found this product by searching the internet. I didn't expect too much, thinking if a pro lawn service can't fix the problem, what chance does an inexperienced home owner have with an "internet product"? Well. All I can say is that this stuff is a little miracle in a bottle! Yep! Fungus is quickly declining after the first homeowner treatment. According to instructions, a second application will be needed and I'm confident that I've solved problem that the professional service could not. It took about 4 days to clearly notice improvement, so don't be impatient. Follow the instructions as closely as possible. I'm a skeptic no more!!!

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    46 of 47 people found this review helpful

  • 4 of 5 Stars

    Time will tell

    By David on 07/08/2015

    Not sure yet after first application for grey leaf fungus in lawn. I will reserve my opinion after future applications. Instructions are very clear and dilution with sprayer are clear.

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    15 of 28 people found this review helpful

  • 4 of 5 Stars

    Lets talk in a year from now

    By James on 06/22/2018

    This is the only fungicide to help Oaks in a diseased area where I have been doing treatments for Oakwilt.I did 15 ml per inch dbh.Will monitor treesand reinject next year

    Was this review helpful to you?  YesNo

    9 of 13 people found this review helpful

  • 4 of 5 Stars

    Rose Savior

    By Jeanne on 06/07/2019

    This is the only product that treats black spot on my roses in steamy Knoxville, TN.

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    6 of 6 people found this review helpful

  • 5 of 5 Stars

    Effective for Oak Wilt

    By Oscar on 08/10/2020

    Saved my tree dying from oak Wilt after applying the injection treatment.

    Was this review helpful to you?  YesNo

    5 of 5 people found this review helpful

See all 23 customer reviews

Questions & Answers

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How soon before or after mowing can you apply Prime Source Propiconazole 14.3 Select Fungicide ?

With most products like Prime Source Propiconazole 14.3 Select Fungicide, you will want to not mow your yard 2 days prior to application or 2 days after application to ensure it is fully absorbed into the yard and to see the full results. 

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27 of 33 people found this answer helpful

How long should Prime Source Propiconazole 14.3 Select Fungicide be applied before it rains?

It is recommended to water in herbicide and fungicide products like Prime Source Propiconazole 14.3 Select Fungicide if you are doing a preventative application or treating foliar diseases because the product needs to get down to the root system. You should allow the sprayed area to dry completely before irrigation or rainfall (usually at least 24 hours is best). 

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18 of 20 people found this answer helpful

Can Prime Source Propiconazole 14.3 Fungicide be used with a hose end sprayer?

Prime Source Propiconazole 14.3 Fungicide would not be recommended to be used in a hose end sprayer as the instructions do not give a rate per gallon when treating lawns.  They give an amount per 1000 sq ft depending on what you are treating for.  You use that rate in however much water it takes for you to cover the area.

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16 of 22 people found this answer helpful

How do I mix Prime Source Propiconazole to treat zoysia brown patch?

Prime Source Propiconazole 14.3 Select Fungicide is applied at 1-2 fl oz per 1,000 sq feet every 14-21 days for zoysia brown patch.  You may also want to take a moment to review our Brown Patch Lawn Care Guide.

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14 of 16 people found this answer helpful

What is the difference between this Prime Source Propiconazole 14.3 Select Fungicide and the Propiconazole 14.3 that can't be shipped to NY?

The only difference between Prime Source Propiconazole 14.3 Select Fungicide made by Prime Source and Propiconazole 14.3 made by Quali-Pro is the manufacturer. The labels are the same and both products have Propiconazole 14.3%. There are various reasons why certain products cannot be sold to certain states, but in this case, the product is not registered in your state by the manufacturer. 

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14 of 15 people found this answer helpful

See all 21 customer questions

Prime Source Propiconazole 14.3 Select Fungicide 4.5 out of 5 stars Rating: 4.5 (23 Reviews / 21 Q&A)

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