Mycostop WP Natural Biofungicide

(7 reviews) Write a Review
0.10 LBS

Product Overview

*Mycostop WP 2 Gram Packets Have Been Discontinued By Lallemand As Of January 2024* 5 Gram & 25 Gram Packets Are Available For Purchase Here

Developed from a naturally occurring bacteria, Streptomyces griseoviridis, Mycostop WP is a preventative product that thrives in the rhizosphere for several weeks and provides effective control on a wide range of pathogens including damping-off caused by various fungi, such as Alternaria and Rhizoctonia solani; and wilt and root diseases caused by FusariumPhytophthora and Pythium. When applied as a drench or spray, the dried spores and mycelium of the Streptomyces culture in Mycostop WP germinate and begin to grow on and around the plant root system. This creates a biological defense against seed and soil-borne pathogens, giving your plants a strong start for vigorous growth and development. Streptomyces deprives pathogenic fungi of space and nourishment by colonizing plant roots, where it also acts as a hyperparasite, disrupting cell walls of pathogens and producing metabolites that further inhibit and disrupt these pathogens.  

  • Organic & 100% natural
  • Based on a naturally occurring, live bacterium (Streptomyces sp. strain K61) that readily colonizes roots for extended protection.
  • Use on all crops such as medicinal herbs, vegetables and ornamentals
  • Can be used simultaneously with nematodes and other biological control organisms, compatible with most IPM programs (see Compatibility Guide below)
  • Control or suppression of many root rot and wilt pathogenic fungi, such as  Pythium, Fusarium, Alteraria, Phomopsis, Phizoctonia, Phytophthora and Botrytis
  • Ideal for Hydroponics, solves most root rot issues
  • Works equally well in organic, mineral and artificial growing media, and field soils
  • Easy application by drench, surface spray or through hydroponic delivery
  • No known risks for resistance due to multiple modes of action
  • Safe to apply, regardless of plant maturity/stage
  • Non-phytotoxic
  • Leaves no toxic residues

Mycostop WP is used by growers for disease caused by Pythium, Fusarium, Rhizoctonia, Alternaria, Phomopsis, and to a lesser extent for Botrytis and Phytophtora.  Mycostop WP has particularly good activity against Fusarium, and is increasingly used as a seed treatment for Pythium, Fusarium, and other seedling pathogens.  

Mycostop WP has been shown to increase plant vigor and yields even in the absence of obvious root pathogen activity, as the Streptomyces produce plant root stimulating hormones that benefit plant health overall.

Application Rates: 

  • Soil Drench: 0.01-0.1% suspension (1-10 grams mixed into 5 gallons of water) - Typical use rate for most garden applications: 1 gram per 10 gallons of water, with each mixed gallon covering 10~ square feet of planted area
  • Foliar spray: 0.05% suspension (10 grams mixed into 5 gallons of water)
  • Foliar fog: 0.3-.45 grams per 100 square feet. See label for water volume
  • Drip: 2.3-4.6 grams per 100 square feet
  • Incorporation in potting media: 0.05% suspension (10 grams mixed into 5 gallons of water) incorporated at 8-20 gallons per cubic yard
  • Hydroponic NFT: 2.5 grams per 1000 plants
  • Hydroponic Rockwool: 20-25 grams per 1000 plants
  • Hydroponic Recirculating/Deep Water Culture (DWC): 1 gram per 25 gallons of recirculating water



Manufacturer Studies and Testing

  1. Mycostop Control of Fusarium on Ornamentals
  2. Mycostop Control of Fusarium on Vegetables

Independent recommendations for use of Mycostop

  1. Natural Supression of Plant Diseases
  2. Microbial Control of Soil pathogens
  3. Mycostop Control Soil Pathogens
  4. Management Strategies of Pythium


Certified organic by the Organic Materials Review Institute


(7 reviews) Write a Review

7 Reviews Hide Reviews Show Reviews

  • 5
    Fast shipping!

    Posted by Rick S on 6th Aug 2023

    Very quick delivery. Expiration date was one year away so this shipment was very fresh. Excellent.

  • 5
    Its great!

    Posted by Agusto Bustamante on 7th Aug 2022

    Perfect and effective, the customer service team is the best, it helps you with your doubts. The shipment arrived on the agreed day. Thank you

  • 5
    Lo mejor de lo mejor!

    Posted by Elisa Montes on 28th Jul 2022

    Ufff este producto sin duda ha cambiado la forma de plantar nuestra cannabis y mejorar nuestro CBD. Lo recomiendo mucho en verdad, el envío ha estado bien y sin problemas.

  • 5

    Posted by Joel Cam on 22nd Jul 2022

    Primero que todo, llego el envío en la fecha indicada sin ningún problema, segundo es increíble como funciona este producto. Dudo que lo deje de usar. Just Wow!

  • 5
    Delivered ASAP

    Posted by April Myers on 7th Oct 2021

    Shipped same day. Cannot do any better than that! We have ordered this and some other biologicals here and it's always been speedy. A+

  • 4
    Bumper crop

    Posted by Cyril S on 2nd Aug 2021

    Our tomato plants have been struggling due to wilt for several years, last fall we hardly got anything edible at all unfortunately. We thought the problem was likely in the soil after consulting a few people at garden centers. One of them suggested Mycostop which they did not have but said was probably the best idea to purchase on the internet to make sure it is fresh. We bought 2 of the 5 gram packets after asking how much we would need to use. We were given clear instructions on how to mix it and when to apply for this website. We have made 2 applications since April and we are seeing much healthier plants than last year. Our problem is Fusarium like a lot of other people. You can't get rid of this disease by doing anything but replacing the soil. And even then it will be back almost immediately. It's like the Flu for plants! This product is all organic and is on the ORMI list or organic things that are approved on plants that you consume. We did not want to use harsh chemicals or dangerous pesticides because there are kids and a few neighborhood cats that could be hurt. We want to see how the vegetables turn out this fall but we will probably keep using Mycstop in the future if it continues to be helpful. Cyril S (customer)

  • 5
    High value fungicide

    Posted by Myco Mikey on 19th Jul 2021

    If you have high value crops you are short changing yourself if you are not employing a biofungicide in your program. Mycostop WP is the very best one available for Fusarium and Pythium. These are the two biggest problems for most growers. Try this in your program once and you will never grow without it again.