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Infection of Scots pine seedlings by Gremmeniella abietina during summer under different inoculum potential

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The connection between natural conidia dispersal of Gremmeniella abietina (A-type) and the disease incidence and severity in first and second year conifer seedlings of Pinus sylvestris was studied in central Finland. The seedlings where exposed to natural infection for a 3-week period throughout the growth season, followed by a 3-week incubation period in a growth chamber to promote symptom expression. In second year seedlings the infection periods in May–June had a similar effect as regards disease outbreak and roughly half of the successful infections occurred during these periods. However, the first year seedlings were more severely diseased after the infection period in late July/early August, although the inoculum density was lower during this time compared with the period in late June/early July. This result is consistent with earlier studies. The effect of age and growth phase of the seedlings, temperature sum and the number of conidia on the disease occurrence is discussed and compared with the results of earlier studies in which artificial inoculation was employed.

Document Type: Research Article


Publication date: 2005-04-01

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