Ennemis naturels deTomicus piniperda etIps acuminatus (Coleoptera, Scolytidae) sur pin sylvestre près d’Orléans, France : Abondance relative et variations temporelles, et notes sur huit espèces prédatrices

Reproductive performance and natural antagonists of univoltine population of Ips typographus (Coleoptera, Curculionidae, Scolytinae) at epidemic level: a study from Šumava Mountains, Central Europe

“…Reproductive success of the beetles depends on three main conditions: temperature, natural enemies, and inter-as well as intraspecific competition (Faccoli, Bernardinelli 2011). In early stages of the development of the offspring generation significant mortality is caused by predators, i. e. flies of the Medetera genus (Dipútera) with frequency of 0.2-0.26 % (Herard, Mercadier 1996). Also Thanasimus formicarius (Linnaeus, 1758) (Coleoptera) is able to reduce the offspring generation of I. typographus by as much as 18 % (Mills 1985).…”

Predator/prey ratios: a measure of bark-beetle population status influenced by stand composition in different French stands after the 1999 storms

“…Epidemic population developments are only observed following storms and largescale wind-felled spruce damage providing abundant breeding material. Thanasimus formicarius (L.) (Coleoptera: Cleridae) exerts a significant impact on the population dynamics of I. typographus [17,18,29,30] because of its high fecundity (106-162 eggs/female [5,30]) and its high voracity at the adult stage (0.86 to 2-3 adult I. typographus per day [7,30]) as well as at the larval stage (44-57 prey larvae during the whole larval life: [5,13,17]). It responds to the pheromone components of different bark-beetle species, including Ips typographus [2,14,27].…”

Research on Parasitoids and Predators of Scolytidae – A Review

“…Parasitoids of Ips typographus have been studied, among others, by Sachtleben (1952), Bombosch (1954), Mills and Schlup (1989), m and Weslien (1992) and those of Tomicus piniperda (L.) and Ips acuminatus (Gyll.) by Hérard and Mercadier (1996) and Balazy et al (1987). Scolytus species have been investigated as well because of their importance as vectors of the Dutch elm disease (e.g .…”

“…k T. formicarius was caught in equal numbers in pine stands attacked the previous year by Tomicus piniperda and in unattacked stands, suggesting that they are extremely mobile (Schroeder 1997). Their appearance early in the year and their response to aggregation pheromones allows them to be one of the first species to colonise barkbeetle broods (Lawson et al 1997;Hérard and Mercadier 1996). T. formicarius' high impact can be explained by its high fecundity (106 eggs/female: Dippel et al 1997), and high voracity; one adult consumes 3 adult Ips typographus per day (Gauss 1954), and each larva consumes 44 to 57 prey larvae during its whole larval life (Mills 1985;Hérard and Mercadier 1996;Dippel et al 1997).…”

“…Their appearance early in the year and their response to aggregation pheromones allows them to be one of the first species to colonise barkbeetle broods (Lawson et al 1997;Hérard and Mercadier 1996). T. formicarius' high impact can be explained by its high fecundity (106 eggs/female: Dippel et al 1997), and high voracity; one adult consumes 3 adult Ips typographus per day (Gauss 1954), and each larva consumes 44 to 57 prey larvae during its whole larval life (Mills 1985;Hérard and Mercadier 1996;Dippel et al 1997). Predator densities attacking I. typographus were estimated at 1.3 to 11 larvae/1000 cm² (Mills, 1985;Thalenhorst 1958).…”