Maria Aslanidou (1)*, Athanasios Papaioannou (2), Elias Pipinis (1), Olga
Mavrokordopoulou (1), Matina Katsanidou (1), and Pavlos Smiris (1)

1. Laboratory of Silviculture, Department of Forestry and Natural Environment, Aristotle University
of Thessaloniki, P.O. Box 262, 54124 Thessaloniki, Greece. *E-mail: maslan@for.auth.gr
2. Laboratory of Forest Soil, Department of Forestry and Natural Environment, Aristotle University
of Thessaloniki, P.O. Box 271,54124 Thessaloniki, Greece.

The present study is based on the differential concentrations of nutrients and heavy metals
observed in Pinus brutia Ten. needles resulting from the influence of various factors, such as
traffic and topographical conditions in four sites in urban and periurban areas of Thessaloniki,
Greece. The results showed that there were significant differences in nutrient and heavy metal
concentrations in the needles collected in the four sites. In particular, the samples from the periurban
forest exhibited significantly higher concentrations of Mg and Ca than the samples collected
in the sites near the centre of the city. The significantly higher concentrations of K observed in the
samples collected from two sites in the city, are possibly attributed to the fertilization of the parks.
The high concentrations of Na found in the samples collected in sites of the periurban forest, are
due to topographical conditions and aerial deposition. However, the highest level of Mn and Zn
observed in the samples collected in the site of the periurban forest located far away from the
busy ring road, is mainly attributed to soil type. High levels of Cu, Pb, Ni and Cr concentrations
were found in the needles collected from the sites close to the busy traffic roads of Thessaloniki.
No significant differences in the levels of Fe and Cd among the samples of the four sites were
found. However, the concentrations of elements measured in P. brutia needles collected in the
urban and periurban areas of Thessaloniki are below the normal level and as a result they do not
constitute an alarming pollution agent in the city.

Uladzimir Torchyk* and Gennady Kholopuk

Central Botanical Garden of Belarus National Academy of Sciences, 2B Surganova str., 220012
Minsk, Belarus. E-mails: dendro@tut.by*, g.holopuk@cbg.org.by

Finding ways to assess the productivity of exotic species under the new climatic conditions is
an important part of the successful introduction of silvicultural practices. The purpose of this research
is assessment of intra-population polymorphism in Douglas fir stands in terms of seasonal
development, color of female strobili and anthers, and bark texture (structure). Concerning the
seasonal development and phenology, the following phenotypes were distinguished: very early,
early, middle, late and very late; according to the color of female strobili - green, greenish-brown
and purple; according to the color of anthers - yellow, orange, purple and brown; and according
to bark texture (structure) - deep fissured cork (coarse bark), middle fissured cork (transitional)
and shallow fissured cork (plane bark) phenotype. Each of the plants was characterized by a
highly individual phenotypic spectrum. The most informative and accessible for practical use were
phenotypes on of bark structure: coarse bark phenotype - bark cork, light, in the form of massive
plates of thickness greater than 5 cm with cavities, divided by deep fissures. At the age of 70-75
years the bark in the butt-log part gradually peels off and falls to a height of 2-3 m. A new bark is
formed actively instead of the fallen one. Transitional phenotype - bark is relatively dense, thickness
up to 4-5 cm, shaked, moderately deep fissures. There is a detachment of the bark at the
root collar to a height of 0.7-1.0 m. Plane bark phenotype - bark is dense, thin, thickness up to
2-3 cm, small plates, cloven by shallow fissures, not exfoliate. Morphological polymorphism of
Douglas fir under bark texture (structure), clearly expressed in the form of introduction populations,
notably characterized by growth index. Trees of deep fissured cork (coarse bark) phenotype
are considered as the most productive. At the age of 71, their average height is 30.8 m, average
diameter - 42.7 cm. Trees of middle fissured cork (transitional) demonstrated lower height by 8 %
and diameter by 20 %. Both phenotypes had a small degree of tapering and a well-developed
crown. Trees of shallow fissured cork (plane bark) phenotype ranked below in height by 25 % and
by 42 % in diameter and are characterized by higher values of variation coefficients. They form a
canopy in the second planting as a regrowth. Thus, deep fissured cork (coarse bark) and middle
fissured cork (transitional) phenotypes are the most promising for planting.

Vasil Kolev (1)* and Galerida Raikova (2)

1. University of Forestry, Faculty of Forestry, Department of Hunting and Game Management,
10 Kliment Ochridski Blvd., 1797 Sofia, Bulgaria. *E-mail: vassilie@abv.bg
2. Sofia University “St. Kl. Ohridski”, Faculty of Biology, Departament of General
and Applied Hydrobiology, 8 Dragan Tzankov Str., 1164 Sofia, Bulgaria.

A study of the Ðœaritsa chub in the Stryama River, a left tributary of the Maritsa River was carried out. The research was conducted in autumn in the period 2006-2011. A total of 458 specimens of Maritsa chub were caught by electrofishing. The size-age composition was simple. The population was represented by five age groups. The chub's population in the Stryama River was dominated by young and middle size groups. The relationship between the average values of L (standard length) and S (scale radius) was described by the equation: L = 17228+2.1934.S; correlation r = 0.9979. The length growth of the chub in the Stryama River is relatively fast. The relation between the fish weight (W) and length of the population was represented by the equation: W = 0.000009.L3.1154; r = 0.9996. The condition factor of the chub in the Stryama River is one of the lowest in comparison with the other water courses in the Aegean catchment area.

Galerida Raikova (1) and Vasil Kolev (2)*

1. Sofia University “St. Kl. Ohridski”, Faculty of Biology, Departament of General
and Applied Hydrobiology, 8 Dragan Tzankov Str., 1164 Sofia, Bulgaria.
2. University of Forestry, Faculty of Forestry, Department of Hunting and Game
Management, 10 Kliment Ochridski Blvd., 1756 Sofia, Bulgaria. *E-mail: vassilie@abv.bg

A study of the Ðœaritsa barbel in the Stryama River, a tributary of the Maritsa River was carried out. The material was collected in autumn from 2006 to 2011 by electrofishing. A total of 537 specimens of Ðœaritsa barbel were caught. The population was represented by six age groups. The rate composition was simple. In the catch of the barbels in the Stryama River dominated third age groups. The dominating size group in the sample of barbel in the Stryama River was between 61-70 mm long. The relationship between the average values of L (standard length) and S (scale radius) was described by the equation: L = 13.7486+2.8974.S; correlation r = 0.9694. The barbel in the Stryama River reaches a smaller length than the barbel in the rivers Arda and Doirani. The relation between fish weight (W) and length in the population was represented by the equation: W = 0.00002. L^2.896; r = 0.9996. The Maritsa barbel in the Stryama River had a lower condition factor than the barbel in the rivers Arda and Maritsa.

Mara Tabakovic-Tosic*, Miroslava Markovic, and Marija Milosavljevic

Department of Forest Protection, Institute of Forestry, 3 Kneza Viseslava str., 11030 Belgrade,
Serbia. *E-mail: mara.tabakovic@gmail.com

In the area of Jablanica Region (Public Enterprise Srbijasume, Forest Estate Leskovac), after
a thirty-year period of latency, significant increase of gypsy moth population level occurred three
times (1996-1997, 2002-2005 and 2011-2014). In the culmination phases, attacked areas were:
22,425 ha (1996), 38,856 ha (2004) and 18,272 ha (2013). The retrogradation phases occurred
in the autumn of 1998, 2005 and 2014, so it was the result of effective aerial control in the larval
instar with microbiological (Foray 48B) and biotechnical (Dimilin SC-48) insecticides as well as
of the increased activity of natural enemies. The analysis of gypsy moth egg masses was made
on a yearly basis. The average number of eggs ranged from 297.7 (1997; 320 investigated egg
masses) to 507.2 (2013; 580 investigated egg masses). The percentage of vital eggs ranged from
89.5 in 2013 to 97.2 in 2012. Average parasitism of eggs ranged from 2.5 % in 2012 to 25.4 % in
2004. Every year only two species of egg parasites Anastatus japonicus Ashmead and Oencyrtus
kuwanae (Howard) were present. Every year the ratio of them was relatively equal with the clear
dominance of O. kuwanae. In the spring of 2012, 2013 and 2014, the increased mortality rate of
larvae was reported and analysed. During the field research clear symptoms of disease caused
by Lymantria dispar multicapsid nuclear polyhedrosis virus (LdMNPV) and typical symptoms of
the fungal diseases caused by Entomophaga maimaiga Humber, Shimazu and R. S. Soper were
found on dead gypsy moth caterpillars. By microscopic analysis of dead caterpillars, the presence
of LdMNPV occlusion bodies, conidiospores and azigospores of E. maimaiga was confirmed.