Oosporbildning av Phythophthora infestans i potatis och bägarnattskatta

Sammanfattning: Potato late blight is one of the most important potato diseases worldwide. The disease is caused by an oomycete called Phytophthora infestans. The host range of P. infestans includes potato (Solanum tuberosum) and hairy nightshade (Solanum physalifolium). Hairy nightshade has recently established itself as an important weed in the southernmost part of Sweden. The work presented here is based on a greenhouse and laboratory study, and aims to compare the formation of oospores in potato resp. hairy nightshade. The results shows that oospore formation is higher in isolates coming from nightshade compared to isolates from potato. This indicates that hairy nightshade might enhance the problems with potato late blight in potato.