The aim of this project is to investigate how we can reduce the problems with powdery mildew in organic cucumber greenhouse cultivation in an economically responsible way. We want to:

• Apply plant strengthening agents on commonly used or promising resistant or tolerant varieties
• Investigate whether these agents can increase the resistance of resistant or tolerant varieties.
• Calculate the costs of these cultivation methods.

We consider the findings of organic greenhouse growers who want to test these applications themselves.