Population dynamics of beech scale (Cryptococcus fagisuga) (Coccina, Pseudococcidae) related to physiological defence reactions of attacked beech trees (Fagus sylvatica)

Chemoecology ◽  
1996 ◽  
Vol 7 (2) ◽  
pp. 112-120 ◽  
Author(s):  
Vincenz Gora ◽  
J�rgen K�nig ◽  
J�rg Lunderst�dt
Keyword(s):  
Population Dynamics ◽  
Fagus Sylvatica ◽  
Cryptococcus Fagisuga ◽  
Defence Reactions

Physiological defence reactions of young beech trees (Fagus sylvatica) to attack by Phyllaphis fagi

1994 ◽  
Vol 70 (1-3) ◽  
pp. 245-254 ◽  
Author(s):  
Vincenz Gora ◽  
Jürgen König ◽  
Jörg Lunderstädt
Keyword(s):  
Fagus Sylvatica ◽  
Defence Reactions

Phenols from Fagus sylvatica and their role in defence against Cryptococcus fagisuga

1997 ◽  
Vol 45 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Anke Dübeler ◽  
Gisela Voltmer ◽  
Vincenz Gora ◽  
Jörg Lunderstädt ◽  
Axel Zeeck
Keyword(s):  
Fagus Sylvatica ◽  
Cryptococcus Fagisuga

scholarly journals Occurrence of disease symptoms and selected biotic factors connected with beech (Fagus sylvatica L.) dieback phenomenon in stands of The Magurski National Park

2012 ◽  
Vol 58 (2) ◽  
pp. 441-452
Author(s):  
Piotr Rojek
Keyword(s):  
Fagus Sylvatica ◽  
National Park ◽  
Forest Site ◽  
Age Classes ◽  
Similar Frequency ◽  
Disease Symptoms ◽  
Age Class ◽  
Leaf Chlorosis ◽  
Cryptococcus Fagisuga ◽  
Crown Thinning

The studies were carried out in 12 beech stands, growing on mountain fresh forest site in Magurski National Park. Stands differed in respect of exposition (northern and southern) and age - lower age classes (21-60 years old) and higher age classes (81-120 years old). This paper presents evaluation of frequency of disease symptoms occurrence in the crowns and on the trunks of beeches. The presence and the place of occurrence of fungus <i>Ascodichaena rugosa</i> and insects <i>Cryptococcus fagisuga</i> and <i>Ectoedemia liebwerdella</i>, which could be connected with beech bark necrosis on the trunks were noted down. In each stand 50 trees, growing side by side in center of the stand, were analyzed. Among 600 analyzed trees of <i>Fagus sylvatica</i>, 2.6% had a dead top. Crown thinning were present on 51.8% of trees. It appeared frequently in higher age class stands and didn't cover more than ¼ of the crown. Moreover, in crowns of 4.1% of trees the leaf chlorosis appeared. The most frequent symptom on trunks of beeches were local necroses (98% of trees), that were sometimes connected with slime fluxing (3.3%). Necroses were the most number in stands growing on the southern exposition and on south parts of the trunks. <i>Cryptococcus fagisuga</i> appeared mostly in high age class stands. Intensity of its appearance was similar on the trees growing on the southern and northern exposition (respectively, 48.3% and 53.3%). Particular parts of the trunks were colonized with similar frequency by <i>C. fagisuga</i> irrespective of cardinal points (N-29.3%; S-21.7%; W-22.7%; E-26.2%) and number of necroses on the trunks. <i>Ascodichaena rugosa</i> appeared on 8.6% of trees, more frequently on their north parts of the trunks (7.3%). In the places colonized by fungi <i>A. rugosa</i>, insect <i>C. fagisuga</i> was absent. Occurrence of larvae of <i>Ectoedemia liebwerdella</i> was mostly found on trunks of beeches growing on the southern exposition (43.0%), on 35.3% of trees they colonized south parts of trunks. There wasn't observed any connection between the occurrence of these larvae and symptoms of local necroses.

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