The height distribution of adult parasitoids of the Dendroctonus frontalis Zimmermann complex trapped on the boles of Pinus taeda L. trees was examined. The study was conducted within two active D. frontalis infestations in the Talladega National Forest in Alabama in July 1998. Stickem Special-coated 15 × 20 cm wire mesh (6 mm2) traps were placed on pines with late instar to adult D. frontalis and Ips spp. at 2 m intervals to a height of 16 m on 12 trees and at 4-m intervals to a height of 16 m on 6 trees. Traps were changed on alternate days for 14 d, and all adult parasitoids of the D. frontalis complex were identified and counted. There was a positive correlation between height and number of parasitoids. This is most likely due to the high proportion of Roptrocerus xylophagorum Ratzeburg and Heydenia unica Cook and Davis collected, because both of these species preferred the upper bole. Each parasitoid species had different height distributions. R. xylophagorum, H. unica and Dendrosoter sulcatus Muesebeck all preferred the upper bole, with a peak trap catch between 12 and 16 m. In contrast, Coeloides pissodis (Ashmead) and Dinotiscus dendroctoni (Ashmead) both preferred the midbole, with a peak catch at 6 m. Only Spathius pallidus Ashmead showed no height preference; however, this species also had the lowest trap catch. Although each parasitoid species had its height preferences, all species were distributed throughout the length of the infested bole.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.