Effect of (+)-limonene and 1-methoxy-2-propanol on Ips typographus response to pheromone blends |
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| Authors: | Miroslav Bla?enec Rastislav Jaku? |
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| Institution: | (1) Institute of Forest Ecology, Slovak Academy of Sciences, Štúrova 2, 960 53 Zvolen, Slovak Republic |
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| Abstract: | We compared two different strategies to increase the catches of Ips typographus (L.), particularly males, in pheromone-baited traps. The first of these strategies, the barrier approach, used alternating
pheromone blends, targeting males and females respectively, in closely-spaced traps forming a barrier around forest stands.
The second strategy, the single trap approach, used widely-spaced traps that were all baited with the same lure and intended
to trap the highest possible numbers of males without compromising trapping of females. In the blend used for the barrier
traps targeting primarily males, with a lower percentage of (4S)-cis-verbenol (cV), the (−)-α-pinene was replaced step wise with (+)-limonene at rates of 0%, 1%, 10%, 35%, 60% and 90%. This
replacement had no significant effect on the numbers of responding I. typographus males, but there was a slight effect on the percentage of males caught. In the attractant blend for the barrier traps targeting
females, with a higher percentage of cV, the 2-methyl-3-buten-2-ol (MB) was replaced with 1-methoxy-2-propanol (MP) in a similar
fashion as for the male-specific blends. The replacement did not significantly affect the catch of females. Thus, it is possible
to use the MP in the blend with cV and ipsdienol without significant change in catch efficacy. In the blends for single traps,
the (−)-α- pinene was replaced with (+)-limonene and MB with MP. The replacement of (−)-α-pinene had only a slight effect
on the percentage of males, but the results suggest that replacing MB with MP in the blend will not significantly reduce trapping
efficacy.
Foundation project: The research was supported by Slovak Research and Development Agency (APVV-51-P06005 and APVV-27-P05205)
and by the Scientific Grant Agency of the Ministry of Education of the Slovak Republic and the Slovak Academy of Sciences
(2/6153/26) |
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| Keywords: | pheromone trap barrier single traps (4S)-cis-verbenol 2-methyl-3-buten-2-ol (− )-α -pinene |
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