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ŠUMARSKI LIST 9-10/2011 str. 67     <-- 67 -->        PDF

H. Uhlíková, O. Nakládal, P. Jakubcová, M. Turčáni: OUTBREAKS OF THE NUN MOTH (Lymantria monacha) ...Šumarski list br. 9–10, CXXXV (2011), 477-486
Figure 2
Spatial distribution of the nun moth outbreaks using Ordinary Kriging based on historical data (1784–2010).The observed values
are cumulative values of feeding intensity. Red colour means regions with the highest feeding intensity (difference in ranges of
observed and interpolated values are due to the smoothing effect of interpolation and its inability to reproduce extreme valuesin
observed data in some cases).


Slika 2.Prostorna distribucija gradacija smrekova prelca dobivena metodom običnog kriginga temeljenog na povijesnim podacima u
razdoblju 1784. – 2010. g. Točkasti podaci predstavljaju kumulativne vrijednosti jačine defolijacije. Crvena boja označuje područja
najjačih defolijacija (diskrepancija točkastih-opažanih defolijacija i obojanih-geostatistički izvedenih podataka, posljedica je
izglađivanja uslijed interpolacije i nemogućnosti prikaza ekstremnih vrijednosti defolijacije u nekim slučajevima).


There are areas where the nun moth damaged foreststhe nun moth particularly defoliated pine stands in lower
only in 1920s (e.g. Jeseníky Mountains, Ostrava region,altitudes in the years 1830–1890 (Kruml 1964a, Novák


th


north part of Ore Mountains).
1966), at the end of the 19century and the beginning of


th


the 20century, the nun moth began to attack spruce


Spruce, pine and larch are typical host plants. During
(Anonymous 1951,Tlapák1965a). It shows a shift of


a massive expansion, caterpillars have also fed onAbies
optimum conditions for development towards the high


sp., and broadleaves such as Quercussp., Fagussp.,
lands. Extensive planting of spruce monoculture also


Carpinussp.,Betulasp.,Acersp.,Ulmussp.,Alnussp.,
contributes to the change of host plant.


Tiliasp.,Salixsp. andPopulussp.(Komárek1931,
Křístek& Urban2004). Rašek(1922) mentionsAn interesting fact is that the nun moth feeding
that caterpillars are also able to defoliate clover fieldsbegan in larch stands and caused a total defoliation
(Trifoliumsp.), Vaccinium myrtillus (L.), Calluna vul-there (Brdy Hills in 1993–1996) (Uhlíková & Nakládal
garis(L.) in times of need. Defoliation ofFraxinussp2010), althoughKomárek(1931) mentions that the
however, has never been recorded. Historical recordsnun moth does not feed in pure larch stands.
show an important change of main host plant.Whereas


5. CONCLUSIONS – Zaključci
The oldest written record of nun moth outbreaks was widespread.The last nun moth outbreaks appeared
in the Czech Republic comes from 1784.The greatestin the years 1993–1996.
calamity of the nun moth was during the years


In the Czech Republic, there are regions where the
1917–1927, especially in Bohemia, where the damage


nun moth has never caused damage to forests (e.g.