The aggregation pheromone system of the larch bark beetle, Ips cembrae Heer

The aggregation pheromone system of Ips cembrae appears to consist of three compounds produced by attacking males. Gas chromatographic analysis of hindgut volatiles revealed the presence of ipsenol, ipsdienol and an additional compound which was identified as 3‐methyl‐3‐buten‐1‐ol. Field bioassays in Scotland and in Germany indicated that neither ipsenol nor ipsdienol alone is effective, but the combination is attractive, and the addition of the methyl butenol increases the response considerably. Zusammenfassung Das Aggregationspheromon des Großen Lärchenborkenkäfers, Ips cembrae Heer. Der Populationslockstoff von Ips cembrae besteht aus den Terpenalkoholen Ipsenol und Ipsdienol, deren Lockwirkung durch 3‐Methyl‐3‐buten‐1‐ol verstärkt wird. Alle drei Komponenten des Aggregationspheromons werden vom männlichen Käfer beim Einbohren in neue Wirtsbäume abgegeben.