Healthy and rotten grapes were collected
separately. A bunchwas regarded as healthy if not a single berrywas infected
or damaged. Bunches regarded as rotten contained more than 3/
4 of heavily infected berries. In total 12 samples consisted of healthy
grapes and 6 samples of sour rotten grapes (Table 1). Samples were
taken aseptically into sterile plastic bags, stored in the cold, and processed
in the laboratory within 12 h. At each sampling site grapes were
collected from areas measuring approximately 50 × 50 m. The vines
fromwhich the grapes were takenwere equally distributed in the sampling
areas. 20 grapes were collected per sampling site.