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Diprionids of the genus Gilpinia living on spruce in the Czech Republic
Penzešová, Markéta ; Lukášová, Karolína (advisor) ; Holuša, Jaroslav (referee)
This bachelor thesis deals with the occurrence of diprionids Gilpinia species associated with the spruce throughout the Czech Republic. In 2015 there was research carried out to map the abundance and frequency of the diprionids. There were Malaise traps - model Townes (1972) installed on 12 locations in spruce forests in early May. There were samples picked up in irregular intervals of 14 days until mid-July. Once all the samples had been collected in the laboratory of CULS in Prague the diprionids were sorted from all the other insects and their type and gender was determined. In total there were 4 specimens caught from Gilpinia polytoma out of which 2 were males and 2 were females. No other diprionids Gilpinia species were found. The results were analysed statistically and the catches were compared with the catches between years 1997-2003 on some identical locations. Further this bachelor thesis deals with leaf-eating insects, bionomic of species found in the Czech Republic. From the results of our study and other studies made in other countries we do not expect the gradation or significant forest damage by these pests in forthcoming years in the Czech Republic. Conversely bionomics of some diprionids on spruce seems to be quite unstudied and finding them can be thought of as rare.
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Comparison of spruce sawflies of the genus Pristiphora in the mountains after 10 years
Englártová, Šárka ; Holuša, Jaroslav (advisor) ; Lukášová, Karolína (referee)
The presence of sawfly Pristiphora was observed in mountain areas in 2015, particularly in Beskydy (Bařiny), Šumava (Královský Hvozd) and Krušné hory (Klínovec). Observation was carried out in there mentioned areas in young spruce stands.Sawflies were cathed help by Malaise trap. Locations were controled every 14 days from April to July 2015. Sawflies were categorized into species and then by gender. At the end results were obtained by statistic program, which confirmed close dependance between flying activity of sawflies and spruce sprouting.
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Comparison of little spruce sawflies Pristiphora abietina in young spruce forests after 10 years
Jirásková, Nikola ; Holuša, Jaroslav (advisor) ; Lukášová, Karolína (referee)
Little spruce sawfly (Pristiphora abietina) pose a significant threat for forests
of the Czech Republic. A better knowledge of its population trends is therefore vital
for mitigating future problems in forestry.
During years 1998-2005 and then again in 2015, field observations of the population
of P. abientina were conducted in few areas of young spruce biotope
in the Czech Republic. The study areas were located in Vítkov Highlands, Javorníky (Maple Mountains) and in the surrounding of five other settlements - Albrechtice, Fryčovice, Skřipov, Spy and Stanovice. The catchment of P. abientina was performed from April till the of July by Malaise traps. Deployed Malaise traps were regularly checked, every 14 days in each study area.
The field study has discovered high numbers of P. abientina in all study locations,
as well as a high generic diversity. The flight activity of P. abientina was observed
as well. This was demonstrated in the study area of Spy, where the individuals
in the flight acitity were recorded from the beginning of May until the end of June.
The study has further discovered a numerical superiority of females over males
in the population of P. abientina. The population in 2015 exhibited a steep decline
in comparison with previous years.
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Comparison of spruce sawflies Pristiphora leucopodia in the Czech Republic Mts after 10 years
Klápšťová, Hana ; Holuša, Jaroslav (advisor) ; Lukášová, Karolína (referee)
This bachelor thesis deals with comparison of spruce sawflies Pristiphora leucopodia in the Czech republic after ten years. In 2015 Malaise traps of Towness type were installed at predetermined locations around the Czech Republic. The collecting of the insects took place from late April to late June. The collected insects were then transported to and manually sorted out in the entomological laboratory of the Faculty of Forestry and Wood Sciences. The results have shown that the current population density is lower than in the previous collecting period, but statistic tests do not confirm this statement.
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Species composition of spruce webspinning sawflies of the genus Cephalcia in the mountains of the Czech Republic
Pfannenstiel, Jan ; Lukášová, Karolína (advisor) ; Holuša, Jaroslav (referee)
The content of this work aims at the density and species composition of sawflies of the Cephalcia genus that can be found in mountain areas above 700 metres above the sea level in the Czech Republic. Six Malaise s traps of the Townsend type were placed in 6 mountain locations at the beginning of April. In two week intervals, samples were gathered from the traps and then marked sealed in bottles. The traps were present at the locations until the end of July. Laboratory determination was performed via the determination key Viitasaari, (2002), that helped to distinguish the sex and species. The distinction was done under the Arsenal stereomicroscope at 10x magnification. Six species of the sawflies genus Cephalcia were caught. There was a total of 2,148 individuals caught of which only 19 were female ones. Most sawflies came from in the location Bařiny in Beskydy, where 1,875 individuals were caught. From the total quantity it can be said that sawflies are in a latent state. Flight activity, which is directly dependent on climatic and temperature conditions, differs in 14 day period from the bionomic of the species.
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Comparison of spruce sawflies Pikonema scutellatum in the Czech Republic after 10 years
Pešek, Marcel ; Lukášová, Karolína (advisor) ; Holuša, Jaroslav (referee)
Pikonema scutellatum is a species with high outbreak potential, which caused local outbreaks in several areas in Europe during the 20th century. Within our research we observed an abundance of the spruce sawflies P. scutellatum at 10 predetermined locations around the Czech Republic in 2015. We used Malaise traps of Towness (1972) type for catching adults from late April to late June. P. scutellatum was detected in 9 of 10 sites with a total of 55 individuals. Which is lower than the previous collecting period in years 1999-2006, but it was not statistically confirmed (Kruskal Wallis test; p>0,05). There was more males then females but this also was not statistically confirmed (Wilcoxon matched pairs test; p>0,05). The flight activity period of P. scutellatum started in May and during June declined significantly. Population densities of observed species are very low and the population is in the latent phase.
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