The Occurrence and Pathogenicity of Cylindrocarpon, Cylindrocladium and Fusarium on Calluna vulgaris and Erica spp. in England and Scotland

Cytindrocarpon, Cylindrocladium and Fusarium spp. were often isolated from the woody roots, stem-base and lower foliage of diseased container-grown Calluna vulgaris and Erica spp. plants collected from English and Scottish nurseries. The highest isolation frequencies were obtained for Cylindrocarpon destrucians, Cylindrocladium scoparium, Cylindrocladium ilicicola. Fusarium tricinctum, Fusarium avenaceum and Fusarium sporotrichioides. Isolations of these fungi were made more frequently from diseased plants that were at least 1-year-old. The percentage incidence of Cylindrocarpon, Cylindrocladium and Fusarium spp. did not differ between Scottish and English nurseries. Cvlindrocarpon desiructans. Cvlindrocladium ilicicola and C. scoparium were more pathogenic to rooted C. vulgaris cuttings than F. tricinctum. F. avenaceum or F. sporotrichioides in laboratory and glasshouse tests. The high isolation frequency of Cylindrocarpon. Cylindrocladium and Fusarium spp., and their pathogenicity in tests, suggests that these fungi are involved in root, stem-base and lower foliage diseases in crops of C. vulgaris and Erica spp. The importance of these findings for the integrated control of diseases on ericaceous piant nurseries is discussed