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Ingredient Index E - G Gliocladium virens GL-21 (129000) Fact Sheet 

Gliocladium virens GL-21 (129000) Fact Sheet 

Issued: 4/00 

On This Page 

I. Description of the Active Ingredient 

II. Use Sites, Target Pests, And Application Methods 

III. Assessing Risks to Human Health 

IV. Assessing Risks to the Environment 

V. Regulatory Information 

VI. Registrant Information 

VII. Additional Contact Information 

Summary 

This pesticide active ingredient is a naturally occurring fungus found throughout the United 

States. When the spores are mixed with soil or other growth media, they prevent plants from 

becoming infected with rots and various other fungal diseases. Gliocladium virens GL-21 is 

approved for consumer use as well as commercial use, at various indoor and outdoor sites. 

No risks to humans, pets, or the environment are expected from use of this active ingredient. 

I. Description of the Active Ingredient 

Name of Active Ingredient: Gliocladium virens GL-21

OPP Chemical Code: 129000 

Gliocladium virens GL-21 is a fungus that is found in many kinds of soil throughout 

the United States. As a pesticide ingredient, the spores of this fungus prevent harmful 

fungi from infecting roots and other parts of plants. Gliocladium virens GL-21 is used 

only to prevent disease. It does not control pathogenic fungi after a plant is already 

infected. 

II. Use Sites, Target Pests, And Application Methods 

Use Sites: Consumer and commercial uses, outdoors and indoors, including 

greenhouses. Crops include ornamentals, vegetables, cotton. 

Target pests: Fungi that cause "damping off" disease and root rot. 

Application Methods: Spores in granular form are mixed with soil or other 

growth media a day before or at the same time as seeding, planting, or 

transplanting. The initial application is usually sufficient, but additional 

applications are possible. The product can also be diluted with water and 

applied directly to soil or root area of plants. 

Related Information 

Regulating Biopesticides 

Active Ingredient Index 

Pesticides: Regulating Pesticides 

Last updated on Wednesday, November 25, 2009

http://www.epa.gov/pesticides/biopesticides/ingredients/factsheets/factsheet_129000.htm

Gliocladium virens GL-21 (129000) Fact Sheet | Pesticides | US EPA Page 1 of 2

http://www.epa.gov/pesticides/biopesticides/ingredients/factsheets/factsheet_1290... 4/8/2010
III. Assessing Risks to Human Health 

No harmful effects to humans are expected from handling or breathing this fungus, or 

from eating treated food. To prevent possible eye irritation to workers, applicators are 

required to use protective eyewear. 

IV. Assessing Risks to the Environment 

Environmental risks are not expected. Gliocladium virens GL-21 occurs naturally in 

many kinds of soil. Its use in pesticide products is not likely to increase exposure of 

wildlife, fish, or other organisms. The fungus does not persist in soil; a few weeks 

after being added to soil, the levels return to the usual background levels. Body 

temperatures of mammals and birds are too high to support growth of Gliocladium 

virens GL-21. 

V. Regulatory Information 

Year active ingredient was initially registered (licensed for sale):

1990 

Number of end products (as of November 2000): 1 

VI. Registrant Information 

Thermo Trilogy Corporation

9145 Guilford Road, Suite 175 

Columbia, MD 21046 

VII. Additional Contact Information 

Ombudsman, Biopesticides and Pollution Prevention Division (7511P) 

Office of Pesticide Programs 

Environmental Protection Agency 

1200 Pennsylvania Avenue, NW 

Washington, D.C. 20460

Gliocladium virens GL-21 (129000) Fact Sheet | Pesticides | US EPA Page 2 of 2

http://www.epa.gov/pesticides/biopesticides/ingredients/factsheets/factsheet_1290... 4/8/2010