Development of fruiting bodies of large tree type of Gremmeniella abietina var. abietina and timing of infection on Scots pine inn northern Finland

• Published in: Forest Pathology
• Main Authors: Kaitera, J., Hantula, J., Jalkanen, R.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1997
• Subjects: Northern Finland
• Online Access: http://dx.doi.org/10.1111/j.1439-0329.1997.tb01362.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1439-0329.1997.tb01362.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1439-0329.1997.tb01362.x

Summary The formation and maturing of the large tree type Gremmeniella abietina var. abietina fruiting bodies and their sporulation were investigated for 3 years on Scots pine ( Pinus sylvestris ) in northern Finland. This was done by monthly assessment of shoots in the field and in the laboratory. Infection caused by G. abietina var. abietina was dated on Scots pine by monthly covering with pollination bags and exposing branches during the growing season. Pycnidia appeared between August and September, 1 year after infection, and they started to release conidia between late June and early July, 2 years after infection. Fresh pycnidia and microconidia were formed during the following August and September in the infected shoots. The causal large tree type of G. abietina var. abietina did not produce apothecia on branches within 3 years of infection. Monthly covering and exposing branches showed that infection took place mainly between June and July.