ZLV Online

Abstract

Poisoned trap trees and tripods started to be applied in defence along with the development of insecticides and pheromones whose negative impacts on the non-target fauna of invertebrates should be, however, taken into account together with the efficiency of these defence measures. In spruce stands with the differentiated mass outbreak base (Forest District Nové Město na Moravě, Czech Republic) we tested lying poisoned trap trees of 4 m in length and tripods with the Storanet net sized 1.5 and 1.9 m2 that was baited with the IT Ecolure pheromone. The efficiency of trapping I. typographus with the poisoned trap trees was statistically significantly higher than that of trapping the beetle with the tripods with the Storanet at both spring and summer swarming. The efficiency of defence measures was only 20–30% in relation to trees infested by bark beetles. A higher number of killed non-target arthropods was recorded on the tripods with the Storanet than on the poisoned trap trees. The IT Ecolure pheromone probably caused an increased occurrence of Acanthocinus aedilis, Molorchus minor, Thanasimus formicarius and T. femoralis species.