Rose Black spot
Rose black spot is caused by the fungi Diplocarpon rosae, a pathogen that before the 1960's had very little attention because of high pollution levels in cities restricting it. However, due to drops in Sulphur dioxide levels in the atmosphere and a better air quality from then onwards it has had a massive economic impact on the rose industry, estimated in the 10’s of billions and is presently the most damaging widespread disease of cultivated roses. Initially a rose black spo