Growers Domain
Mycostop by Verdera

Prevent & Suppress Damaging Diseases With This Biological Fungicide!

Due to its outstanding effectiveness, this classic biofungicide has been in demand since it first came it market in Finland in 1990. It contains the mycelium and spores of Streptomyces Strain K61, a naturally occurring bacterium derived from Sphagnum peat. It thrives in the root zone and controls some of the most destructive of plant pathogens, including Damping Off , wilt and root diseases like Alternaria , Rhizoctonia solani , Fusarium , Phytopthora and Pythium .

3-Way Mode of Action:

  1. It rapidly colonizes plant roots, displacing the pathogenic fungi there and depriving it of nourishment.
  2. Acts as a hyperparasite by disrupting, and ultimately breaking down, the cell walls of the pathogens.
  3. Produces metabolites that constrain the plant pathogens but encourage the plant's defense mechanisms and promote healthy growth.

Additional Benefits of Mycostop:

  • Approved for organic horticulture and agriculture.
  • Disease protection lasts for weeks, but the long-lasting impact will be healthier plants and bigger yields.
  • Compatible with IPM (Integrated Pest Management) programs.
  • It poses no risk to beneficials and there is no risk of resistance being built up.
  • Restricted Entry Interval (REI) of 4 hours.

For best results, Mycostop should be used preventatively. However, it can be used for an infestation; in which case, it should be applied at a higher rate and more frequently. Streptomyces Strain K61 will live in the rhizosphere and keep working for several weeks.


Use all contents in packet the same day. Do not store opened packets since product will lose its activity.

This Product Controls These Pests or Diseases: seed rot, root and stem rot and wilt diseases caused by Fusarium , Alternaria and Phomopsis of container grown ornamentals, vegetables and tree and forest seedlings.

This product will suppress the following diseases: Botrytis Gray Mold and root rots of Pythium , Phytophthora and Rhizoctonia in the greenhouse. NOTE – Use as a seed treatment for seed or soil-borne damping off and early root rot of vegetables, herbs and ornamentals planted in the field or greenhouse.



Warning & Toxicities: Hazards to human and domestic animals. Harmful if inhaled. Avoid breathing dust or spray mist. Causes moderate eye irritation. Avoid contact with skin, eyes or clothing. Wash thoroughly with soap and water after handling and before eating, drinking, chewing gum, using tobacco or using the toilet. Remove and wash contaminated clothing before resuse. Prolonged or frequently repeated skin contact may cause allergic reaction in some individuals.

Environmental Hazards: Do not apply directly to water, to areas where surface water is present or to intertidal areas below the mean high water mark. Do not contaminate water by disposal of equipment wash waters or rinsate.

Shelf Life: Unopened packages stored in a cool (at or below 46°F/8°C) have a viable shelf life of 12 months.

Active Ingredients/Guaranteed Analysis:

35.0%..........Dried spores and mycelium of ray fungus ( Streptomyces Strain K61)*
65.0%..........Other Ingredients

* Contains a minimum of 10 8 CFU (colony forming units) per 1 gram of products.

OMRI Certified
Product Details
Recommended Usage
Streptomyces Strain K61
  • Mycostop Product Label
  • Mycostop Use Instructions Sheet
  • Mycostop SDS
Use & Instructions

Mycostop is primarily used in the form of an acqueous solution and then applied as a seed treatment, transplant/cutting dip, soil spray/drench, or through drip irrigation. To make a suspension of Mycostop, mix in a small volume of water, such as 0.25-1.0 gallon, and let stand for approximately 30 minutes. Agitate as needed to evenly disperse Mycostop before diluting to final volume. Refer to the Use Instructions Sheet for additional application information and detailed mix rates.

Full instructions can be found on the Product Label . Do not tank mix with any pesticides or with concentrated fertilizers.

Suggested Uses: To be used to control and suppress seed and soil-borne diseases in ornamentals, vegetables, flowering plants, trees, herbs, transplants, seedlings and conifers grown outdoors or in greenhouses in all growth media.


Storage: Do not contaminate potable water, food or feed by storage or disposal. Mycostop consists of living microbes that are packed in moisture and air proof unit packages. Store in a cool (below 46°F, 8 °C), dry place. Use all contents in packet the same day. Do not store opened packets since product will lose its activity.

Diseases & Pests Controlled
  • Botrytis
  • Gray Mold
  • Pythium
  • Phytophthora
  • Rhizoctonia
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