OVIPOSITION BIOLOGY OF ACANTHOCINUS NODOSUS (COLEOPTERA: CERAMBYCIDAE) IN PINUS TAEDA

Abstract

Oviposition biology of Acanthocinus nodosus was examined on southern pine beetle (SPB), Dendroctonus frontalis, infested loblolly pine trees in Alabama, U.S.A. Components of oviposition biology, including oviposition pit description, colonization period, average number of eggs laid per oviposition pit, use of bark beetle entrance or ventilation holes as oviposition sites, and pit density were described. Acanthocinus nodosus oviposition pits were easily differentiated from Monochamus titillator, another cerambycid species that also inhabits SPB-killed trees. Colonization of trees by A. nodosus began within 2 days of initial SPB attack and lasted for 8 to 14 days. Females laid an average of 3.33 (SE ± 0.48) eggs per oviposition pit and 99% of the pits occurred on SPB entrance and ventilation holes. All pits were on the lower bole between 18 and 163 cm above the ground. Oviposition pit density ranged from 0.22 to 0.45 pits per cm2 of bark surface. Potential interactions with other phloem inhabiting species were noted.