Radovi, No. iz.br. 9, 2006.
Izvorni znanstveni članak
INVESTIGATION OF PHEROMONES AND TRAPS FOR PROGNOSIS OF THE FIR BARK BEETLE PITYOKTEINES CURVIDENS GERMAR (COLEOPTERA, SCOLYTIDAE)
Milan Pernek
orcid.org/0000-0001-8200-6913
; Šumarski institut, Jastrebarsko
Dinka Matošević
orcid.org/0000-0001-7380-688X
; Šumarski institut, Jastrebarsko
Boris Hrašovec
; Šumarski fakultet Sveučilišta u Zagrebu
Sažetak
Because of frequent problems with the bark beetle over the last few years in Croatia, the question of their effective control has been raised. Within the concept of integrated protection of the forests attempts to introduce ecologically acceptable methods of protection have increased, such as for example pheromone traps. In the published investigation the pheromone preparation Curviwit, declared as pheromone of the fir bark beetle Pityokteines curvidens, was tested in combination with Theysohn® and IPM® traps. The aim of this study was to obtain knowledge on the possibilities of applying pheromone traps to catch the fir bark beetle.
The experiment was set up in several compartments at Litorić (Forestry Office "Vrbovsko", Forest Administration Branch Office "Delnice") for a period of two years (2004-2005). In both experimental years two types of traps were used: Theysohn® and IPM®, and in 2005 a modified version of Theysohn was added. In the experiment a pheromone dispenser was used in all traps under the name Curviwit® (Witasek, Feldkirchen, Austria) declared as pheromone of bark beetle P. curvidens, with active components methylbutenol and ipsenol (2-methyl-6-methylen-2, 7-oktadien-4-ol) and with evaporation ("ratio rate") 1mg/day at 24°. In 2004 the pheromone dispenser was placed on 31st March and replaced with a new one on 31st June, and in 2005 placed on the 30th March
and replaced on 7th June. The traps were controlled and emptied every 7-8 days. The bark beetles trapped were conserved in ethanol (50%) and later analysed in the laboratory. Laboratory analysis included determination of the bark beetles according to species and sex.
The results of the catch in the traps indicate that the flight of the spring generation of P. curvidens depends on the daily temperature, which must reach 10°C. Swarming begins atthe beginning of April and the main flight and greatest catch in the traps is achieved at the
end of April and beginning of May. After the greatest catch of insects there follows a sudden decrease and the catch is later very low after the change of pheromones in the summer. The
number of male beetles caught in the traps at the beginning of swarming is several times
greater than of the females, although during the greatest catches it becomes equal at 1:1.
From the two-year investigation of pheromone traps for the fir bark beetle, the following
conclusions can be made:
1. The traps for the fir bark beetle Pityokteines curvidens germar should be placed at
the latest at the beginning of April, because the greatest catch can be expected at the
end of April and beginning of May.
2. Of the tested traps in the experiment the best catches were achieved with the modified
Theysohn trap.
3. After the sudden decrease in the catches at the end of April or beginning of May pheromone should be removed from the traps in order not to catch undesired insects, particularly useful or rare species.
4. The ratio of the sexes in the traps was initially 3:1, and later in the period of the greatest catch it amounted to 1:1, which corresponds with the natural ratio of sexes.
5. The investigation should be continued in accordance with the obtained results and comparison of the traps and relevant catch trees.
Ključne riječi
fir bark beetles; Pityokteines spp.; Pityokteines curvidens; Curviwit; pheromon trap; IPM; Theysohn
Hrčak ID:
26025
URI
Datum izdavanja:
24.9.2006.
Posjeta: 2.074 *