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Zhodnocení efektivity stromových mikroinjektáží jako metody tvorby navnaděných stojících otrávených lapáků na lýkožrouta smrkového (Ips typographus Linnaeus, 1758) na lesních pozemcích Města Poličky
Háp, Matěj
Many technologies are currently used in practice for pest management and control. One technology that is becoming more widely used is the microinjection method. This method is the focus of this thesis, which specializes in the use of microinjection as a defensive method against the European spruce bark beetle (Ips typographus (Karst.) L.). The investigation took place in 2022, when 25 trees were injected at 5 sites before the start of spring swarming. In addition, 5 control trees were selected at each site and I. typographus was baited with a synthetic pheromone. The effectiveness of this method was then evaluated by comparing the lengths of the mother galleries and larval galleries on the debarked bark strips and by means of a photo-eclector experiment. The data were then statistically evaluated using the Kruskal-Wallis test, which showed that bark beetles on trees treated with injection had significantly shorter mother and larval galleries. The photo-eclector survey showed that the number of I. typographus from logs that came from injection-treated trees accounted for only 10.88% of the total number of imagoes captured. This value demonstrates that microinjection is not only an effective method against leaf miners and skeletonizing insects on deciduous trees, but its application can also be in the management of bark beetles on spruce.
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TEMPERATURE MOISTURE PROCESS STUDY IN MODERN WOOD STRUCTURES
Dohnal, Jakub ; Hradil, Petr (referee) ; Straka,, Bohumil (referee) ; Pěnčík, Jan (advisor)
In building structures wood is very often used as construction material and can also be used for supplemental non-supporting structures, e.g. as wood panelling, screening elements, etc. The most common woody plant species that can found in the biotope of the Czech Republic are Norway spruce (Picea abies L.) and Scots pine (Pinus sylvestris L.). Wood as construction material is popular in architect comunity as well as this material like also investors, who prefer living in healthy and natural environments. Wooden structures are also popular with structural engineers for their good mechanical properties and low weight, which, however, depends on moisture. Wood properties vary in every natural way and need to be taken into account at the beginning of the designing process. This dissertation aims to contribute to the description of mechanical characteristics of wood during changes of moisture content in the wood structure. Various experimental tests and numerical modelling were used in the thesis in order to reach the aims. The experimental tests examined mechanical properties at different sample moisture of selected woody plant species. Subsequently, the obtained values were compared with values available in specialist and scientific literature, so that these values could subsequently be used as input values for numeric calculations. The conclusions of the dissertation will contribute to more accurate calculations and further analysis.
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