Dried cellular hydrocolloid carriers for biological control of pathogens
There is a need for a method to protect live biological control agents that have been deposited on the ground or sprayed on plants against UV radiation
Viable micro organisms are entrapped in dried solid hydrocolloid carriers
The hydrocolloid beads are porous, allowing release of products derived from micro organisms to control plant pathogens or of the micro organisms themselves
Enables effective, sustained release in field conditions of biological control agents against plant pathogens, fertilizers, micro organisms for nitrogen fixation or increased growth response
Gel beads are freeze-dried to produce and enhance a porous structure. The result is a low-density dried cellular product composed of many fused open and closed cells. Exposure to moisture allows the controlled release or extended release of the micro organisms and other substrates, substances and/or products that are contained within the carrier from the matrix.
The dried beads preserve the viability of bacteria or fungi which act against, or produce substances which act against, plant pathogens.
The hydrocolloidal structure protects the micro organisms from UV radiation.
Endows the product with extended shelf-life
Further research will be focus on adaptation for additional micro organisms and biotechnological applications, such as continuous fermentation
Biological pesticides accounted for a significant part of the plants protection market. It is estimated that the global plants protection market will grow
SEM of typical freeze-dried alginate bead walls.
Panel A: Control (dry bead without bacteria).
Panel B: Dry bead.
Panel C: Dry bead with glycerol.
Panel D: Dry bead with bentonite and glycerol.
Panel E: Dry bead with chitin and glycerol.
Panel F: Dry bead with kaolin and glycerol.