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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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