acta societatis botanicorum poloniae - LV Zjazd Polskiego ...

SPOrES OF THE GENUS AlternAriA – THE SOUrCE
OF INFECTION OF PLANTS FrOM THE BrASSI-
CACEAE FAMILY IN THE WIELKOPOLSKA rEGION
(2006– 2008)
Uruska Agnieszka 1 , Kaczmarek Joanna 2 , Jędryczka Małgorzata
2 . 1 Adam Mickiewicz University, Institute of Environmental
Biology, Laboratory of Aeropalynology, 89 Umultowska St.,
61-614 Poznań, Poland, bioau@amu.edu.pl; 2 Polish Academy
of Sciences, Institute of Plant Genetics, 34 Strzeszyńska St.,
60-479 Poznań, Poland
Beside the great risk of allergies caused by the spores of the
genus Alternaria, its numerous species are very pathogenic to
agricultural crops. The species belonging to Alternaria can
cause seedling blights and diseases of numerous crop plants,
mostly called black or dark spots. They can cause big economic
problems to growers of vegetables and producers of agricultural
crops belonging to the Brassicaceae family, leading to such serious
diseases as dark and grey leaf spot of cabbages, cauliflowers,
brussel sprouts and oilseed rape. The aim of this experiment
was to examine the concentration of Alternaria spp. spores in
the region of Wielkopolska (Great Poland). The experiment was
done in 2006– 2008, using the Burkard spore trap, operating
from March to May and from September to November. The results
indicate great changes in the presence and concentration of
spores in different years and seasons. In general, substantially
higher spore concentrations were found in the autumn compared
to the spring. In the analyzed periods great differences were
observed in seasonal summary numbers of Alternaria spores.
From September to November 2006 this sum was as high as
2159 S/m 3 , but in the other seasons it was much lower. Similar
dependencies were found for maximal daily spore concentrations,
varying from 45 S/m 3 /24h to 197 S/m 3 /24h.
Aerobiology
THE FLOWErING PHENOLOGY ANd dYNAMICS
OF HAZEL (corylus SP.) POLLEN SEASONS IN dIF-
FErENT dISTrICTS OF LUBLIN IN THE PErIOd
2008– 2009
Weryszko-Chmielewska Elżbieta, Sulborska Aneta, Piotrowska
Krystyna. University of Life Sciences, Department
of Botany, 15 Akademicka St., 20-590 Lublin, Poland, elzbieta.
weryszko@up.lublin.pl
With favourable weather conditions, hazel starts flowering as
early as the end of January. Phenological observations of flowering
of Corylus avellana L. were conducted in Lublin at five sites;
2– 3 shrubs were designated at each site. Four flowering stages
were determined. Airborne hazel pollen counts were performed
using the volumetric method (Lanzoni VPPS 2000 sampler). In
both years of the study, the hazel flowering period at particular
sites started at different times and it was characterized by
varying lengths of the respective stages. The blooming of the
first flowers was noted earliest at the sunny site in the Botanical
Garden of the Maria Curie-Skłodowska University in Lublin,
where flowering lasted longest. The delayed and the shortestlasting
period of flowering was observed in Nadrzeczna Street
at the shaded site. In 2008, the hazel pollen season was between
the dates of 21 January and 28 April, whereas in 2009 it lasted
from 6 February to 27 April. Large variations were shown in the
values and dates of occurrence of maximum pollen concentrations.
In 2008 the maximum concentration was 104 grains in
1 m 3 (24 February), while in 2009 it reached 368 grains in 1 m 3
(28 March). Annual totals of daily pollen counts in the study
years did not show large differences; they were 804 and 967,
respectively. The full bloom of hazel coincided with the date of
occurrence of maximum airborne pollen concentrations only at
two sampling sites.