FUNGI AND LICHENS IN THE BALTICS AND BEYOND XVIII ...

Berl.), powdery mildew (Erysiphe flexuosa (Peck) U. Braun et S. Takamats) on horse
chestnut; black blotch (Rhytisma acerinum Fr.), brown blotch (Phillosticta negundinis Sacc.
et Speg.), powdery mildew (Uncinula aceris Saсс.) on Norway maple; dark-brown blotch
(Cercospora microsora Saсс.), brown blotch (Phillosticta tilia Sacc. et Speg.) on tillet.
Infection rate of various diseases is closely connected to the specificity of the
conditions of urban environment. For example, high concentration of gaseous pollutants
aggravates the state of trees and influences such pathogens as incitants of the powdery
mildew. Powdery mildew develops worse on the streets with heavy traffic, than in public
green spaces, so the greatest degree of the spread of the disease was noticed on territories that
were less polluted. The same dependence was also noticed with regard to the species
composition of the incitants of the diseases of leaves: more fungi occurred in situations of
lower pollution. Similar tendency was noticed for blotches: the prevalence and the intensity of
the diseases were higher where pollution was lower.
THE SEARCH OF WOODY PLANT PATHOGEN – PHYTOPHTHORA SPP. IN
LITHUANIA
V. SNIEŠKIENĖ 1 , A. STANKEVIČIENĖ 1 , K. ŽEIMAVIČIUS 1 , R. PŪKIENĖ 2 , A. VITAS 2
1 Kaunas Botanical Garden, Vytautas Magnus University, Z. E. Žilibero 6,
LT-46324 Kaunas, Lithuania
2 Faculty of Natural Sciences, Environmental Research Centre, Vytautas Magnus University,
Z. E. Žilibero 6, LT-46324 Kaunas, Lithuania
E-mails: v.snieskiene@bs.vdu.lt, a.vitas@gmf.vdu.lt
The global climate change influences intensity, migration and spread of Phytophthora
genus fungi causing woody plant injuries. During 2010–2011 in Lithuania, trees of 16 species
from various genera, e.g., Acer, Aesculus, Alnus, Betula, Quercus, Populus, Salix, Tilia with
stem damages (wet rust-colour spots) typical to Phytophthora fungi genus were found.
Acknowledgements. The research was supported by the Research Council of Lithuania
(Project No LEK-21/2010).
PATHOGENIC MYCOBIOTA ON PLANTS OF THE GENUS Alnus Mill.
M. A. TOMOSHEVICH*, E. V. BANAEV
Central Siberian Botanical Garden of RAS, Zolotodolinskaya Str. 101, 630090 Novosibirsk,
Russia
*E-mail: arysa9@mail.ru
The genus Alnus Mill. includes about 30 species mainly distributed in the
circumboreal zone. Study of mycobiota on alder plants within the area of host plant
distribution with consideration of different environmental factors is of a special interest. A
significant difference in numbers of pathogen species on various alder species is probably
connected not much with resistance of host plants but with a better study of A. rubra.
The research conducted on Alnus species in Siberia substantiates this conclusion. In
the arboretum of Central Siberian Botanical Garden, SB RAS, for the first time to Russia,
Mycopappus alni (Dearn. et Barthol.) Readhead et G. P. White has been discovered on the
leaves of A. incana (L.) Moench and A. glutinosa (L.) Gaertn., whereas earlier this species
was only found in A. rubra and A. crispa (Aiton) Pursh subsp. sinuata (Regel) Hultén. in