This document provides information on the effect of different fungicides on oospores of potato late blight (Phytophthora infestans). The newsletter is a summary of a Dutch investigation presented at the EAPR conference in 2002. The investigation shows that almost all plant protection products in Denmark approved for control of potato late blight are effective against oospores. Seven plant protection products and the number of oospores after treatment with different fungicides are listed in a table. The investigation shows that oospores are an important source of primary inoculum in the lifecycle of potato late blight.
