STUDIES ON THE RELEVANCE OF CATCHING NEMO SOMA-ELONGATUM (L) (COL-OSTOMIDAE) IN CHALCOPRAX BAITED TRAPS FOR POPULATION-DYNAMICS OF PITYOGENES-CHALCOGRAPHUS (L) (COL-SCOLYTIDAE)

Nemosoma elongatum, an antagonist of Pityogenes chalcographus, is caug ht unintentionally in CHALCOPRAX(R) baited traps. Studies on nutrition of larvae and adults and the high abundance of N. elongatum found in bark beetle galleries showed that this predator might have an importan t influence on the breeding success of P. chalcographus. Calculating t he predator's efficiency, it results that, in tune with the prey consu mption of adults and larvae, the same number of N. elongatum, caught i n CHALCOPRAX(R) baited traps, would destroy more than the sixfold numb er of P. chalcographus also caught in the same traps. The effect of co -trapping N. elongatum on predator-prey relation is discussed and esti mated considerable. Possibilities to support this effective antagonist are outlined.