Effects of three years’ increase in density of the geometrid Epirrita autumnata on the change in metabolome of mountain birch trees (Betula pubescens ssp. czerepanovii)

Chemoecology ◽  
2014 ◽  
Vol 24 (5) ◽  
pp. 201-214 ◽  
Author(s):  
Vladimir Ossipov ◽  
Tero Klemola ◽  
Kai Ruohomäki ◽  
Juha-Pekka Salminen
Keyword(s):  
Betula Pubescens ◽  
Mountain Birch ◽  
Epirrita Autumnata ◽  
Birch Trees

Effects of localized defoliations on female inflorescences in mountain birch, Betula pubescens ssp. tortuosa

1989 ◽  
Vol 67 (2) ◽  
pp. 334-338 ◽  
Author(s):  
Juha Tuomi ◽  
Timo Vuorisalo ◽  
Pekka Niemelä ◽  
Erkki Haukioja
Keyword(s):  
Betula Pubescens ◽  
Mountain Birch ◽  
Final Weight ◽  
Final Length ◽  
Short Shoots ◽  
Leaf Flush ◽  
Biomass Increase

Two experiments were done to test how the removal of foliage from small branches in mountain birch, Betula pubescens spp. tortuosa, may influence the biomass increase of female inflorescences that emerge from reproductive buds on short shoots. First, all the leaves on small twigs were removed shortly after leaf flush in June. Defoliated twigs included on average of five leaves and two reproductive short shoots. Effects of the treatment on the final length and mass of female catkins were studied in August by comparing defoliated twigs to undefoliated ones of the same trees. Second, a similar experiment was carried out by defoliating larger branches with an average of 150 leaves and 56 short shoots and by comparing defoliated branches to adjacent undefoliated branches. The first treatment reduced final weight of inflorescences by about 17% and the second treatment by about 18%. Localized defoliations can thus have limited effects on the biomass increase of female inflorescences. Short shoots are therefore partially autonomous reproductive units that are integrated subunits of higher-level interactive units, e.g., branches, root – shoot subsystems, or entire plants.

Systematic within-tree variation in mountain birch leaf quality for a geometrid, Epirrita autumnata

1995 ◽  
Vol 20 (3) ◽  
pp. 283-292 ◽  
Author(s):  
JANNE SUOMELA ◽  
PEKKA KAITANIEMI ◽  
ANNA NILSON
Keyword(s):  
Mountain Birch ◽  
Epirrita Autumnata ◽  
Leaf Quality
Sign in / Sign up

Export Citation Format

Share Document