Scolytids constitute an insect group of forest ecosystems that is very important both ecologically and economically, and which has been well studied in most European countries. However, new species are found quite often, especially in regions searched less intensively to date. In this paper three species of scolytid fauna not previously known in Romania are reported for the first time: Trypodendron laeve, Xylosandrus germanus and Hylastes linearis.

1 Field trapping experiments were conducted to evaluate the response of Ips duplicatus (Sahlberg) (Coleoptera: Curculionidae, Scolytinae) beetles to different combinations of synthetic pheromone with the monoterpenes (−)-α-pinene and (+)-limonene. 2 The addition of (−)-α-pinene to the pheromone led to a significant increase (by 36.3-47.8%) of I. duplicatus captures when the pheromone : terpene ratio was 1 : 40. When the ratio increased beyond

Ips duplicatus is an important pest of Norway spruce (Picea abies) planted outside of its natural range. This species uses olfactory signals to identify the spruce trees favourable for colonisation. The knowledge of the beetles' response to these stimuli is important for managing this pest. Therefore, the response of Ips duplicatus to a specific synthetic pheromone was investigated under some natural sources of volatile emissions characteristic of

Ips duplicatus was collected in Romania for the first time in 1948. Afterwards, between 1957 and 1967, it was found in different places, but only as a faunistic element. The first outbreak of this species was reported in 2008 in spruce stands installed outside the natural area (the North-Eastern part of Romania). Using pheromonal traps in 2010 we initiated the checking of its presence in five locations of Suceava County, and the research continued

For over 20 years it has been known that mature adults of Hylobius abietis are attracted by the combination of alpha-pinene and ethanol. However, it is not clear to what extent weevil response to these stimuli is influenced when large quantities of similar volatile substances are present in the environment, and how the response depends on the release rate of volatile substances from traps. Nothing that, in fresh Norway spruce clear-cuttings, the

The aim of the research presented in this paper was to prove that the effect of (-)alphapinene on the response of Ips typographus (L.) to its aggregation pheromone depends on the release rates of both pheromone and monoterpene volatiles. Six treatments have been tested in four experimental areas using six replicates for each treatment: V1 - pheromone + (-)alpha-pinen 200 mg/day, V2 - pheromone + (-)alpha-pinen 500 mg/day, V3 - pheromone + (-)alpha-pinen