Biofungicides are biological fungicides that contain living organisms such as fungi, bacteria or actinomycetes that attack plant pathogens and reduce the diseases they cause. They can be used as part of an integrated disease management program to reduce the risk of pathogens developing resistance to traditional fungicides. Currently, there are no pathogens known to be resistant to biological fungicides.

Biofungicides should be used as a preventative treatment in conjunction with a regular monitoring program where root health and crop quality are evaluated. As with traditional fungicides, they will not cure diseased plants and must be applied before the onset of disease. Biological fungicides need to be used in conjuction with standard cultural practices that are used to help prevent disease. Storage conditions, soil and air temperatures and use of other chemicals affect their efficacy. Most biological fungicides also have a limited shelf life of one year. A number of products are commercially available for use on vegetable bedding plants. See Table 24 for information on labeled crops and diseases for these biological fungicides.