Use of microalgae in organic farming

Pest-repellent active ingredients from microalgae and cyanobacteria are suitable as ecologically compatible, biologically based plant protection products. For applications in the organic cultivation of cabbage or in organic viticulture, we have developed processes for the production of microalgae with repellent or antifungal activity in cross-departmental cooperation.

Reference projects

Fertiliser pellets for organic farming - EcoBug


No chemically synthesised pesticides or fertilisers may be used in organic farming. Cabbage varieties or rape grown according to organic farming guidelines are therefore quite frequently infested by cabbage flies, a widespread plant pest. This sometimes leads to severe crop losses.


Duration: December 2008 - January 2012

Ecological plant protection agent against fungal attack from microalgae


At present, most of the winegrowers in organic winegrowing treat their vines for fungal infestation with agents that contain the heavy metal copper as an active ingredient. The copper accumulates in the soil and, among other things, damages or kills valuable soil microorganisms.

MIATEST – Functional ingredients from algae for health-promoting food and as plant strengthening agent in viticulture


The MIATEST project deals with the production of functional ingredients from diatoms and their application in different areas. At Fraunhofer IGB, the production of the ingredients as well as their extraction and purification are optimized.


Duration: November 2018 – October 2020