Sources of inoculum of Lophodermium seditiosum on Pinus sylvestris1

摘要

AbstractA survey of the incidence ofLophodermium seditiosum, L. pinastriandL. conigenumin plantations ofPinus sylvestrisin north‐east Scotland showed thatL. seditiosumpredominated on fallen cones and on young needles which tell prematurely in early summer.L. pinastripredominated on old senescent needles which fell in autumn. The incidence ofL. conigenumwas low on fallen cones and needles and it is not thought that tins species could effectively replaceL. seditiosum.It is concluded that the main source ofL. seditiosuminoculum for infections in plantations and nearby nurseries is young infected fallen needles on which ascocarps form in late summer and autum