Infection by Armillaria mellea and some Factors Affecting Host Resistance and the Severity of Diseas

Oxford

1978

121-135

Sonderdruck

12787S

40002134

Infection by A. mellea in Britain occurs by means of rhizomorphs; the transfer of mycelium at root contacts is probably not important as a means of spread. Following the initial phase of rhizomorph penetration, established infection in the cambium is preceded by ectotrophic spread of mycelium in the bark scales. Field investigation confirmed reports in the literature that in susceptible conifers the greatest number of deaths generally occurs approximately 6-8 years after planting. However, attacks can also occur in much older crops and the reasons for this are discussed.