A new blight of Buxus in UK caused by Cylindrocladium sp.
Henricot et al. (2000) report a serious foliar disease of box (Buxus sempervirens) occurring in the UK since 1998 (different parts of England, southern and central Scotland). The disease has also been found on other Buxus spp. Dark brown spots appear on the leaves, with black streaks on the stems and eventual defoliation. A Cylindrocladium sp. has been isolated and shown to satisfy Koch's postulates. This species has been compared with other members of the form-genus by morphological and molecular methods and not found to correspond exactly to any published species. The disease is often found in association with volutella blight caused by Pseudonectria rousseliana. There is no indication that box is affected by Cylindrocladium in any other country, so the disease appears to be entirely new.