BACKGROUND Parasitoids are frequently used in biological control due to the fact that they are considered host specific and highly efficient at attacking their hosts. As they spend a significant part of their life cycle within their hosts, feeding habits and life history of their host can promote specialization via host-race formation (sequential radiation). The specialized host races from diff...

Plant viruses, and aphids as their vectors, are limiting factors in sugar beet production. Viral plant diseases currently impossible to treat but knowing the flight patterns of can help reducing number potential virus vectors. Monitoring aphid activities fields was done using yellow water traps from April end November. During two years investigation, a total 5514 specimens 75 different taxa wer...