Fungi on red raspberry from lesions associated with feeding wounds of cane midge (Resseliella theobaldi)

摘要

SUMMARYTwo types of vascular lesion are described from the base of canes in plantations infested by raspberry cane midge (Resseliella theobaldi); (1) brown lobate lesions (‘patches’) confined to midge feeding areas, (2) brown lesions spreading proximally and distally from the point of infection (‘stripes’). Either or both types of lesion may be presented in individual canes. Isolations from (1) produced principallyFusarium avenaceum; isolations from tissues where (1) and (2) are contiguous gaveLeptosphaeria coniothyriumandF. avenaceum; isolations from (2) arising from old cane stub wounds in the absence of midge gaveL. coniothyrium.The important secondary role of fungi in the midge blight complex is confirmed, but the involvement ofL. coniothyriumin the complex is unclear because it also infects stub wounds on midge‐infes