Our potassium bicarbonate (BIKA) is used as a biological bio-fungicide in ecological farming. It is e.g. effective against powdery mildew and Botrytis on grapevines. BIKA can be combined with other traditional fungicide products thereby enabling additional opportunities in traditional agriculture. BIKA has a multiplex principle of operation, acting via a combination of several effects. It is applied preventative/protective. No risk of resistance even with frequent applications occurs. There are no pre-harvest intervals and BIKA is residue-free.