How can I tell if the biofilm in my hydroponic system is beneficial?
What tests can a person perform to find out if biofilm in a hydroponic system is beneficial?
Biofilms usually contain a number of different microbial species, some of which may be pathogenic (but usually many which are also beneficial or benign in a healthy system). There are no basic grower tests to tell if the biofilm is harmful that I am aware of.
However, if the plants in the system are suffering from a root rot pathogen such as Pythium, then the biofilm is likely to be harbouring this and will act as a source of reinfection even if the diseased plants are removed.
There may be some laboratories which could test a sample of a biofilm see if certain plant pathogens could be cultured, but this does not necessarily indicate that active disease is present or that the biofilm is harmful.
For more details on biolfilms in hydroponics, refer to Is Biofilm in a Hydroponic System Bad?
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Written by Lynette Morgan
Dr. Lynette Morgan holds a B. Hort. Tech. degree and a PhD in hydroponic greenhouse production from Massey University, New Zealand. A partner with SUNTEC International Hydroponic Consultants, Lynette is involved in remote and on-site consultancy services for new and existing commercial greenhouse growers worldwide as well as research trials and product development for manufacturers of hydroponic products. Lynette has authored five hydroponic technical books and is working on her sixth.Full Bio