The within-tree distributions of Ips paraconfusus (Coleoptera: Scolytidae) and its insect associates in Monterey pine (Pinus radiata).
In studies in California, there were no significant differences in the attack density, gallery length, and number of eggs per unit of gallery of Ips paraconfusus Lanier within the infested tree boles of Pinus radiata. Adults of species of Aleocharinae and Plegaderus and larvae of Medetera aldrichii Wheeler were evenly distributed throughout the infested tree bole. There was a significant, positive linear correlation with tree height and the number of larvae of Coeloides rufovariegatus (Prov.), Rhopalicus pulchripennis (Crwf.), and Roptrocerus xylophagorum (Ratz.); the bark being thinner in the upper parts of the tree bole allowed the parasites' ovipositors to reach the host larvae through the bark.