LALSTOP K61 Biofungicide 100 Gram Packet

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MSRP: $119.99
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Product Overview

Developed from a naturally occurring bacteria, Streptomyces griseoviridis, LALSTOP® K61 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 LALSTOP K61 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

LALSTOP K61 is used by growers for disease caused by Pythium, Fusarium, Rhizoctonia, Alternaria, Phomopsis, and to a lesser extent for Botrytis and Phytophtora.  LALSTOP K61 has particularly good activity against Fusarium, and is increasingly used as a seed treatment for Pythium, Fusarium, and other seedling pathogens.  

LALSTOP K61 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

Please contact us directly for more specific application rates and instructions


LALSTOP K61 General Information

LALSTOP K61 For Potatoes

LALSTOP K61 Safety Data Sheet

LALSTOP K61 Compatibility Guide

LALSTOP K61 OMRI Certification


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  • 5
    Free shipping!

    Posted by Jaime R on 7th Aug 2023

    Best deal anywhere online

  • 5
    Excellent service

    Posted by Andre Campbell on 19th Jul 2023

    Shipped the same day I ordered and got here in 2 more days with expedited priority mail. Cheapest price on shipping anywhere. Good service and they can help with hydro questions.