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: Occurrence, development and harmfulness of the bark anobiid Ernobius mollis(L.) (Coleoptera: Anobiidae) Abstract: The paper summarizes results of the study of the occurrence, development and harmfulness of Ernobius mollis (Linnaeus, 1758), which occurred plentifully on Pinus nigra Arn. impaired by drought in the CR in 2000. It is based on laboratory rearings in photoeclectors and numerous analyses of branches (stems) of pines from 5 localities in Brno. Partial studies were carried out in 5 other localities in Moravia and Eastern Bohemia. Under laboratory conditions, imagoes occurred mainly in June-August, viz at a 1 ♂: 3 ♀♀ ratio. Males and females were on average 4.4 and 4.9 mm long, respectively. In living trees, imagoes of substandard dimensions developed. In dead trees, the average length of males and females gradually decreased with increasing damage in the particular years. Immediately after hatching, gonads of imagoes were mostly only partly developed. Females matured sexually during the first hours (maximally during 2 days) of their life in the open. In their ovaries, some 14 to 136 (on average 42.2) eggs occurred. With the increasing size of females their fecundity increased significantly. The development of larvae progressed through 4 instars. One grown up larva destroyed about 1.8 cm2 cambium. Wood was damaged to a depth of 2 mm and sporadically to a depth of 15 mm. Imagoes left wood through exit holes of a diameter of 1.1 to 2.1 (on average 1.6) mm in bark. Their development was univoltine. The pest damaged the same wood repeatedly for a period of 5 years. Keywords: Anobiidae, Ernobius mollis, Pinus nigra, occurrence, development, harmfulness Journal: Journal of Forest Science Pages: 327-347 Volume: 51 Issue: 8 Year: 2005 DOI: 10.17221/4569-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4569-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200508-0001.txt Handle: RePEc:caa:jnljfs:v:51:y:2005:i:8:id:4569-JFS Template-Type: ReDIF-Article 1.0 Author-Name: M. Čermák Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Author-Name: M. Martinková Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Author-Name: D. Palovčíková Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Author-Name: L. Jankovský Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Title: About phytopathological and histological aspects of Norway spruce dieback in the Orlické hory Mts. Abstract: The condition was evaluated of tissues of declining young spruce stands in selected localities of the Orlické hory Mts. It refers to stands occurring in top parts affected by an air pollution disaster in the last century. Several types of damage of a different symptomatic character were distinguished. A high NOx input appears to be the risk factor of spruce dieback in the Orlické hory Mts. One of the main causes in the complex of factors is the unbalanced cause of meteorological factors during the year and unbalance in mineral nutrition. The result is decrease in lignification, immaturity of tissues before the winter period and increased susceptibility of damaged tissues to parasites. Several potentially pathogenic species of micromycetes have been identified which can be considered to be significant pathogenic agents in case of declining spruce in the Orlické hory Mts., however, not a main cause. Keywords: spruce decline, Gremmeniella abietina, Ascocalyx abietina, Sirococcus strobilinus, NOx Journal: Journal of Forest Science Pages: 348-358 Volume: 51 Issue: 8 Year: 2005 DOI: 10.17221/4570-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4570-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200508-0002.txt Handle: RePEc:caa:jnljfs:v:51:y:2005:i:8:id:4570-JFS Template-Type: ReDIF-Article 1.0 Author-Name: P. Plašil Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Author-Name: P. Cudlín Author-Workplace-Name: Institute of Landscape Ecology, Academy of Sciences of the CR, České Budějovice, Czech Republic Title: Population dynamics of eight-toothed spruce bark beetle (Ips typographus[L.]) in the area of National Nature Reserve Praděd in 1998-2001 Abstract: The paper deals with the study of bionomics and population dynamics of Ips typographus (L.) in the area of the Praděd National Nature Reserve (NNR). Data were collected on the basis of detected feeding marks, beetles caught in traps, and also according to the frequency of occurrence or increase in the number of standing dead trees killed by the bark beetle attack in localities where sanitation felling was not performed. Finally, evaluation of the present condition of forest stand and population dynamics of Ips typographus was carried out. The results showed that the stands currently occur in the stage of disintegration when the role of the bark beetle is irreplaceable. Based on the research findings, the management of the bark beetle was proposed that would enable to achieve so-called regulated disintegration of natural spruce forests in the area of the Praděd NNR. Keywords: Ips typographus (L.), population dynamics, management of Ips typographus, NNR Praděd, regulated disintegration Journal: Journal of Forest Science Pages: 359-370 Volume: 51 Issue: 8 Year: 2005 DOI: 10.17221/4571-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4571-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200508-0003.txt Handle: RePEc:caa:jnljfs:v:51:y:2005:i:8:id:4571-JFS Template-Type: ReDIF-Article 1.0 Author-Name: K. Houšková Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic Title: A role of the mechanical preparation of soil in the natural regeneration of pedunculate oak (Quercus robur L.) in floodplain forests Abstract: The subject of our research was to verify effects of the mechanical preparation of soil in the natural regeneration of pedunculate oak in a floodplain forest. On the site of a hard-wooded floodplain forest at the confluence of the Morava and Dyje rivers (Czech Republic), several sample plots were established differing in the preparation of soil during regeneration, in weeding the plots and in the period of the implementation of soil surface scarification before and after the fall (or distribution) of acorns. On the basis of results obtained, mechanical preparation of soil on non-weed-infested plots in the heavy seed year is not necessary, however, it supports seedling emergence from acorns and eliminates weed tree emergence and weed. However, it is better to realize it only after the fall of acorns and to incorporate them into soil and thus their emergence will be increased. Soil scarification can be carried out also in the course of harvesting the parent stand through the extraction of wood and slash from the regenerating area. In weed-infested stands, however, the thorough preparation of soil before the fall of acorns appears to be a necessity. Keywords: mechanical preparation of soil, weed, natural regeneration, pedunculate oak, floodplain forest Journal: Journal of Forest Science Pages: 371-379 Volume: 51 Issue: 8 Year: 2005 DOI: 10.17221/4572-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4572-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200508-0004.txt Handle: RePEc:caa:jnljfs:v:51:y:2005:i:8:id:4572-JFS