Template-Type: ReDIF-Article 1.0 Author-Name: J. Urban Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Title: Contribution to the knowledge of development and harmfulness of imported willow leaf beetle (Plagiodera versicolora) (Coleoptera, Chrysomelidae) Abstract: The paper deals with the occurrence, development and harmfulness of imported willow leaf beetle (Plagiodera versicolora Laich.) in riparian and accompanying stands of the Svratka and Svitava rivers in the region of Brno. Salix fragilis L. and S. × rubens Schr. are the most damaged species there. Imagoes leave wintering places usually at the beginning of May. During about a 60-day period, they damage ca. 23.3 cm2 leaves of S. fragilis and lay 250 to 730 (on average 539) eggs. The whole egg-laying consists of 16 to 48 (on average 35.5) groups with 6 to 26 (on average 15.2) eggs. The fecundity of females hatched in the laboratory is minimally twice lower. Larvae hatch after 5 to 8 (in the laboratory after 4.3) days and damage about 282 mm2 leaves. The development from laying eggs until hatching imagoes of the 1st generation takes about 21 (in the laboratory about 15) days. Imagoes of the 1st generation occur on trees from the end of May to mid-August and die after completing their reproduction. Plagiodera versicolora creates 3 to 4 (in the laboratory 4 to 6) generations during a year. The small part of imagoes of the 2nd generation, predominant part (or all) imagoes of the 3rd generation and under conditions of a tetravoltine development all imagoes of the 4th generation enter a diapause. In the course of the growing season, the food consumption of imagoes and larvae decreases and fecundity of females markedly decreases. Schizonotus sieboldi (Ratz.), Medina melania (Meig.) and M. luctuosa (Meig.) rank among main enemies of Plagiodera versicolora. Keywords: Plagiodera versicolora, Chrysomelidae, occurrence, development, fecundity, enemies, economic importance Journal: Journal of Forest Science Pages: 481-507 Volume: 51 Issue: 11 Year: 2005 DOI: 10.17221/4582-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4582-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200511-0001.txt Handle: RePEc:caa:jnljfs:v:51:y:2005:i:11:id:4582-JFS Template-Type: ReDIF-Article 1.0 Author-Name: P. Šamonil Author-Workplace-Name: Faculty of Forestry and Environment, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: J. Viewegh Author-Workplace-Name: Faculty of Forestry and Environment, Czech University of Agriculture in Prague, Prague, Czech Republic Title: Forest site classification of forest ecosystems in Bohemian Karst (Czech Republic) Abstract: The study focuses on selected forest site units on water uninfluenced sites on limestone in Bohemian Karst. The species composition of phytocoenoses, their potential production and soil properties were assessed. Studied forest site complexes are correctly determined and they provide important information from the aspect of planning and practical nature conservation management. It is necessary to specify the criteria of categoria calcaria in detail, since it is often difficult to distinguish it from categoria mesotrophica. Water retention capacity of soils, a criterion often neglected so far, presents a useful view of forest site water budget and it is a suitable criterion in forest site classification. Keywords: Bohemian Karst, limestone, forest site classification, soil, phytocoenose, oak, beech Journal: Journal of Forest Science Pages: 508-518 Volume: 51 Issue: 11 Year: 2005 DOI: 10.17221/4583-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4583-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200511-0002.txt Handle: RePEc:caa:jnljfs:v:51:y:2005:i:11:id:4583-JFS Template-Type: ReDIF-Article 1.0 Author-Name: S. Hering Author-Workplace-Name: Landesforstpräsidium, Department of Silviculture, Central Forestry Department of Saxony, Graupa, Germany Author-Name: S. Irrgang Author-Workplace-Name: Landesforstpräsidium, Department of Silviculture, Central Forestry Department of Saxony, Graupa, Germany Title: Conversion of substitute tree species stands and pure spruce stands in theOreMountains inSaxony- A Report Abstract: The original natural forest ecosystems of the OreMountains(Norway spruce, silver fir, and beech forests) have been destroyed by overcropping since the 11th century. In the 19th century spruce afforestations on large areas were intended to meet the steadily increasing demand for timber. They led to the introduction of planned forestry by building up spruce age-class forests. Efforts of a few forest specialists to establish an ecologically adapted silviculture failed before long due to economic necessities. The paper presents the results of a complex experimental plot system aiming at the forest conversion in theOreMountains. Answers are given particularly to problems of the upper stand treatment for regeneration and of appropriate ways of soil preparation and planting. A network of forest climate stations and a broad variety of ecophysiological and yield investigations provide the basis for conclusions on light, temperature, soil, and water demand by regenerated tree species. Keywords: substitute tree species stands, pure spruce stands, species composition conversion, Ore Mountains Mts., Germany Journal: Journal of Forest Science Pages: 519-525 Volume: 51 Issue: 11 Year: 2005 DOI: 10.17221/4584-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4584-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200511-0003.txt Handle: RePEc:caa:jnljfs:v:51:y:2005:i:11:id:4584-JFS