sdu faculty of forestry journal special edition 2009 - Orman Fakültesi

SDÜ Faculty of Forestry Journal
dicaryotic phase of the rust fungus in the plots and in their neighbourhood were
recorded. Silver fir can only be infected by the rusts basidiospores, exclusively
originating from the alternate host.
Table 1: List of monitoring plots(a.p.: advance planting; n.r. natural regeneration)
Stand
Numb
er
District Geology
Forest
Compartment
184
Regeneration
type
Altitude
(m s l)
N
plots
1 Schw.-Baar Braunjura XI_1 a.p. 808 4
2 Schw.-Baar Keuper IV_2 a.p. 739 4
3 Schw.-Baar Keuper IV_3 a.p. 737 4
4 Br.-Hschw. Buntsandstein III_2 a.p. 1036 5
5 Br.-Hschw. Muschelkalk XXV_6 a.p. 732 3
6 Br.-Hschw. Muschelkalk XXV_7 a.p. 873 3
7 Br.-Hschw. Muschelkalk XXV_9 a.p. 811 4
8 Br.-Hschw. Muschelkalk XXVII_1 a.p. 722 3
9 Schw.-Baar Braunjura X_6 n.r. 822 7
10 Tuttlingen Braunjura Gew.Teilenw. n.r. 802 4
11 Br.-Hschw. Granit/Gneis Urishof a.p. 1062 4
12 Schw.-Baar Braunjura XI_1 a.p. 806 4
13 Br.-Hschw. Granit/Gneis Urishof a.p 1050 4
3. RESULTS
Mean
846
Total
53
Incidence of broom rust in the stands (average of percentage infected firs per
plot) stretched from 2.2 till 100 % (Table 2). In five stands, 100% were reached;
the mean amount was 63.8%. The percentage of stem cankers was lower (in
average by 35.5%) and decreased parallel with the general disease incidence. In
seven stands, more than 50% of the trees bared stem cankers (mean 42.4 %).
As alternate host of the rust fungus nearly exclusively S. nemorum was
recorded. In most cases, it was found numerously at roadsides and in logging lines,
in the vicinity of the plots rather than in the plots themselves. This plant species
was found much more frequently in stands with higher disease incidence.
Neither density of canopy and young stand nor geological factors nor age class
of the plantings respective regenerations showed evidence to be related with the
percentage of the diseased silver fir trees. Advance plantings seemed to be more
infected than natural regenerations.