The project will, in collaboration with farmers, extension officers and researchers, develop integrated pest management strategies against powdery mildew in greenhouse production of cucumber. Microbiological pest control products permitted in the EU and/or other parts of the world as well as other previously investigated non-chemical products will be examined. The efficacy of the products will first be determined individually, then in different combinations, with and without fungicides, in small scale greenhouse trials. Both tolerant and non tolerant cucumber varieties will be included in the study. The strategy determined to be most efficient to control powdery mildew will be tested in large scale greenhouse production systems.