Terrazole 35WP Fungicide

5 out of 5 stars 1 Reviews | 3 Q&A

Terrazole 35WP Fungicide
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Average Rating

5 out of 5 stars Rating: 5

1 Review | 3 Q&A

Product Overview

Terrazole 35WP can be used as both a preventative and curative fungicide and should be applied when symptoms of disease first appear. The active ingredient in Terrazole 35WP, etridiazole, comes in a wettable powder formula that effectively controls and prevents Pythium and Phytophthora diseases in ornamentals, nursery crops, and turf. Examples of diseases affected by Terrazole 35WP are root rot, stem diseases, damping-off, stem rot, water mold, and crown rot disease.

Features and Specs

Active Ingredient Etridiazole 35%
Target pests Pythium spp, Phytophthora spp., root rot, stem diseases, damping-off, stem rot, water mold, and crown rot disease
* See label for complete listing
For use in Ornamentals, Nursery crops, Golf Course Tees and Greens
Application Golf Course Turf-grass (Tees & Greens): 2 - 4 oz. per 2 - 5 gallons of water for 1,000 sq. ft.
* See label for complete application instructions for Ornamental and Nursery crops
Pet safe Yes, when used as directed on label
Formulation Professional Product
Shipping Weight 2.07 lbs
Manufacturer OHP Inc.
EPA Registration 400-416



TERRAZOLE 35WP is effective for the control of Pythium blight, cottony blight, grease spot, spot blight, root rot, crown rot and damping-off disease caused by Pythium spp.

TERRAZOLE 35WP can be applied as a spray to both newly seeded and established turf.

Application is limited to tees and greens. Application to fairways is prohibited.

For commercial use only. Not for use on home lawns, sod farms or municipal parks.

Do not allow animals to graze on treated areas and do not feed clippings from treated areas to animals.


TERRAZOLE 35WP controls water mold, damping off, root rot, stem rot and crown rot diseases caused by Pythium spp. and Phytophthora spp.

TERRAZOLE 35WP is mixed with water and applied as a soil drench, beginning at the time of seeding or transplanting.

For use in commercial nurseries and greenhouses only.

Use in residential greenhouses or other indoor plant sites is prohibited.

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  • 5 of 5 Stars

    Worked For Me

    By Searider on 07/29/2016

    Researched fungicides to fight a nasty bout of pythium & phytophthora that had taken hold in my brugmansia beds & killed off 6 of my prized cultivars. Banrot was my first choice based on recommendations but discovered it's banned in my state, so went with Terrazole 35WP because it has one of the active ingredients of Banrot that is allowed here. Received order in 2 days in a well contained cardboard box. Bag of Terrazole is small but since I'm not using a lot for my needs, opted for the smallest amount of product to do the job. Product was applied to my flower beds as a soil drench. Since I only have a 1-gal sprayer, used two 1-gal plastic milk jugs with the smallest dosage cut in half for each & then added each mixture one at a time to sprayer for application to ground around plants. Plants had no damage/trauma from product & product did not clog my sprayer. This is a very fine light colored powder so make sure you're wearing a respirator/particle mask before opening the bag. Once mixed, has a smell faintly reminiscent of Chlordane (to me) but is undetectable once applied. Best to apply this before it rains as mixture needs to be watered in after application to hit the root zone. Bag is resealable but I suggest putting it inside another one as a precaution. Results were almost immediate with my plants as I noticed the remaining ones were starting to perk back up after 3 days & after 1 week they were back to normal. Have not had another episode since applying product only once. Others may need to apply more frequently based on their situation/disease pressure.

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    10 of 10 people found this review helpful

Questions & Answers

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What amount of Terrazole WP do I use for 1000sq ft of turf? Dry or liquid measure?

Noy having prior experience with a WP, maybe I'm over thinking this, but I'm not sure whether the product label refers to dry or liquid measure. For turf, the label instructs 2-4 ounces for 1000 sq ft in 2-5 gallons of water. Simple enough, but is that the number of dry ounces of Terrazole powder used per gallon (which would seem to be a huge amount) OR liquid ounces of solution after mixing? Assuming it's liquid, what dry measure of Terrazole is used to get a liquid ounce? Tablespoon, etc.? Or another way, I want to use in a one gallon sprayer to cover 1000 sq ft. How much WP do I use?

Yes, Terrazole 35Wp is a wettable powder and is measured in ounces before mixing with water. The application ratio changes depending on what you are applying the product to and how deep the soil is. You can find the application ratio charts on pages 3 and 4 of the product label.

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2 of 4 people found this answer helpful

On golf course greens, does Terrazole 35WP have to be watered in?

applying to control root rot


No, Terrazole 35WP does not need to be watered in after application. This product is mixed with water and applied directly to the goft course turf. Be sure to follow the label with regards to reapplication times.

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1 of 1 people found this answer helpful

Can Terrazole 35WP Fungicide be applied to plants near the edge of a large Koi pond? Will this hurt fish or koi if runoff were to go into the pond?

Terrazole 35WP Fungicide should should be kept at least 20 feet way from ponds and only applied when the weather is calm. Please review the full product label for more information. 

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Terrazole 35WP Fungicide 5 out of 5 stars Rating: 5 (1 Reviews / 3 Q&A)

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