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Assessment of the impact of pathogens on larch bark beetle (Ips cembrae) female fertility
 Klačmerová, Zuzana ; Lukášová, Karolína (advisor) ; Vanická, Hana (referee)
This bachelor thesis deals with the assessment of the impact of pathogens on larch bark beetle (Ips cembrae) female fertility. In 2015 there was a research being done where the numbers of laid eggs from healthy and infected female beetles were compared. During March and April in three locations of Central Bohemian region some larch trees were cut down, used as traps and left at sunny spots, covered with branches. The collecting of samples was done in June, after the female beetles laid their eggs. First part of the research was a dissection of internal organs that was done on collected female beetles from these locations. Second part of the research was done on their laid eggs. The total number of examined beetles that were used for this research is 381. All these samples were carefully examined under microscopes in CULS laboratory in Prague. The pathogens that were found can be classified as commonly parasitic pathogens for the larch bark beetle. My own research did not prove that the infested female beetles would lay less eggs than healthy ones. Exception is Rakovník location, where was recorded higher number of laid eggs in females without nematodes, and female infected by Chytridiopsis typographi created significantly longer maternal galleries than healthy ones.
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