Spirulina

It is critical to clarify that Spirulina is not a plant disease. It is a genus of cyanobacteria (blue-green algae) widely recognized for its high nutritional value and extensive use in biotechnology, animal feed, and as a component in plant growth biostimulants.

Confusion regarding Spirulina as a pathogen often stems from the overgrowth of algae in irrigation systems. In hydroponics or field irrigation, the proliferation of cyanobacteria can clog filters and drip lines, creating mechanical issues that stress crops due to water deprivation, rather than biological infection.

The primary indicators of cyanobacterial growth in water systems include the appearance of green slime, surface films, or cloudy water in reservoirs. This growth is a response to favorable environmental conditions rather than an attack on the crop itself.

Conditions that facilitate the development of these microorganisms include high levels of nitrates and phosphates, poor water circulation, and direct exposure to intense sunlight. When these factors align in storage tanks or irrigation pipes, microbial biomass increases rapidly.

To ensure healthy crop development and avoid equipment failure, agronomists should implement strict water management practices. This includes regular cleaning of reservoirs, the use of appropriate filtration systems, and, if necessary, the application of non-toxic algaecides to prevent the accumulation of biofilm in irrigation networks.