These studies were conducted in Izmir (Bornova) under natural conditions with three years old rootstocks grown in pots. One-day old neonates were used for artificial infestations of different apricot rootstocks and 5 neonates of Capnodis tenebrionis (Linnaeus, 1758) were given per rootstock for artificial infestation. The same procedure was followed for infestation of C. carbonaria (Klug, 1829). Relationship has not been determined between prunasin compounds of roots and infestation, but it has been determined prunasin accumulation between varieties. The percentage of C. tenebrionis infested saplings and the number of larvae per sapling arranged from the highest to the lowest for cultivar as follows: Sekerpare > Soganci > X1 Zerdali > Kabaasi > Tokaloglu > Adilcevaz 2 > X2 Zerdali > Sam > Adilcevaz 1 > Hacihaliloglu > Adilcevaz 4 > Hasanbey while the percentage of C. carbonaria infested saplings and the number of larvae per sapling arranged from the highest to the lowest for cultivars as follows: Adilcevaz 1 > Adilcevaz 2 > X2 Zerdali > X1 Zerdali > Hacihaliloglu > Soganci > Hasanbey > Sam > Adilcevaz 4.