Contribution to knowledge of Hylesinus fraxini (Panzer, 1779) (Coleoptera: Scolytidae) natural enemies from Northern Moravia (Czech Republic)

Abstract

Predation by natural enemies was studied as mortality factors of Hylesinus fraxini in 2006-2007. Predation by birds was not recorded and predation rate by insect reached 0.1%. Only one insect predator was reared - Thanasimus formicarius (Linnaeus, 1758). The total rate of parasitism was 54.0%. At least 8 species of parasitoids from the order Hymenoptera were recorded. The most abundant parasitoid was Eurytoma morio Boheman, 1836 (44.1% from the total number of all reared parasitoids; 23.8% of the total mortality), subsequently Eurytoma arctica Thomson, 1876 (31.7%; 17.1%), Cheiropachus quadrum (Fabricius, 1787) (12.8%; 6.9%), Braconidae (6.3%; 3.4%), Rhaphitelus maculatus Walker, 1834 (3.9%; 2.1%), Mesopolobus sp. (0.5%; 0.3%), were not identified Pteromalidae (0.5%; 0.3%) and Tetrastichus sp. (0.2%; 0.1%).

Keywords

• predators
• parasitoids
• natural enemies
• bark beetles
• hylesinus fraxini
• thanasimus formicarius
• cheiro- pachus quadrum
• eurytoma morio
• eurytoma arctica
• czech republic
• central europe