Insufficient crop protection is an increasingly limiting factor for crop production. Damage by slugs and cabbage stem flea beetles in winter oilseed rape are timely examples of increasing crop protection problems in Sweden. We will test whether companion cropping winter oilseed rape with frost sensitive legumes can reduce slug and flea beetle damage. We will further test how slugs can be suppressed and their natural enemies (carabid beetles) enhanced in winter oilseed rape established with no- or low-till methods. The long term population development of cabbage stem flea beetles, its drivers and management options will be analyzed using an already digitized extensive database (1969-2018, 2889 winter oilseed rape fields). With a combination of field observations and experiments, laboratory studies, and analyses of extant data, our overall aim is to promote crop protection when establishing winter oilseed rape by developing effective integrated pest management options.