BAITED PITFALL AND FLIGHT TRAPS IN MONITORING HYLOBIUS-ABIETIS (L) (COL, CURCULIONIDAE)

Baited pitfall traps with standardised baits (alpha-pinene, ethanol 96 %, water) were used for monitoring Hylobius abietis adult populations in fresh (less than one year old) and older clearings in Pinetum and Pineto-Piceetum associations in South Bohemia, CSFR. Five traps situat ed in a row in a homogeneous site close to an uncut grove were found m ost useful as a monitoring standard for an area, whereas a heterogeneo us placement and smaller number of traps were found to provide insuffi cient information. The age of the clearing was also important as it ca used differences in the population curve (s. discussion). H. abietis f lying adults were found not to be attracted by aggregation pheromones of the bark beetles and synthetic host volatiles (alpha-pinene, ethano l) situated either isolatedly or simultaneously in flight traps common ly used for bark beetle monitoring and control.