Biological Control Of Plant Diseases (Greenhouse)

When one living organism is used to inhibit the activity of a living plant pathogen, it is said to be a biological control agent (BCA).
Biological Control Of Plant Diseases (Greenhouse) - Articles


BCAs are registered for use by the Environmental Protection Agency (EPA) and have labels very similar to those for chemical pesticides. BCAs can be hazardous to the applicator and all safety equipment recommended on the label should be used. BCAs may have to be applied more than once in order to maintain adequate protection. Follow the label recommendations for the amount to use, the method of application, and application intervals. BCAs can be used on the same crop with chemical pesticides. In general, a BCA should be applied 10 days before or 10 days after applying a chemical. Below is a partial list of biocontrol agents and the pathogens listed on their labels as being controlled:

Biological Controls

Biological control agent (type of organism)Trade Name (EPA reg. no.)Target pathogens on one or more of the product labels
Agrobacterium radiobacter (bacterium)Galltrol A (strain 84) (40230-1)
Norbac 84C (strain K84) (38087-2)
Agrobacterium tumefacians (crown gall)
Ampelomyces quisqualis (fungus)AG10 (55638-16)Powdery mildew
Bacillus subtilis (bacterium)Companion (GB03 strain) (71065-1)
Serenade (69592-4)
Rhapsody (QST 713 strain) (69592-10)
Pythium, Fusarium, Phytophthora, Rhizoctonia, powdery mildew, Colletotrichum, Erwinia, Pseudononas, Xanthomonas, Diplocarpon, Cercospora, Venturia.
Candida oleophila (yeast)Aspire (55638-29)
Gliocladium catenulatum (fungus)PrimastopPythium, Rhizoctonia, Botrytis
Streptomyces lydicus (actinomycete (fungus-like bacterium)
Streptomyces griseoviridis
Actinovate (73314-1)

Mycostop (64137-5)
Pythium, Fusarium, Phytophthora, Rhizoctonia, Botrytis, powdery mildew, downy mildew, Sclerotinia, Verticillium.

Botrytis, Alternaria, Phomopsis, Pythium, Fusarium, Phytophthora
Trichoderma harzianum (fungus)

Trichoderma virens
PlantShield, (68539-4)

SoilGard (70051-3)
Pythium, Fusarium, Phytophthora, Rhizoctonia, Botrytis, powdery mildew, downy mildew, Sclerotinia