ON A STRATEGY TO CONTROL IPS-TYPOGRAPHUS AT THE BEGINNING OF A GRADATION

A new strategy for combatting Ips typographus is described. It consist s of an early application (end of March/beginning of April) of a syste mic insecticide to standing spruce trees in a southern or western expo sure, the application of pheromone to these stems when flight starts a nd the punctual removal of infested untreated trees. These measures to combat the 1st generation can reduce the damage caused by the 2nd gen eration to a very low level (tab. 3 and 7). The factors upon which the success of this strategy depends are examined.