Monday, December 11, 2006

Optimizing egg releases of Sasajiscymnus tsugae for biological control of the hemlock woolly adelgid, Adelges tsugae, in the southern Appalachians

Isaac Deal, ideal@utk.edu1, Jerome Grant, jgrant@utk.edu1, Daniel Palmer, daniel.palmer@ag.state.nj.us2, Rusty Rhea3, and P. L. Lambdin, plambdin@utk.edu1. (1) University of Tennessee, Entomology and Plant Pathology, 2431 Joe Johnson Drive, 205 Ellington Plant Sciences Building, Knoxville, TN, (2) New Jersey Department of Agriculture, Phillip Alampi Beneficial Insect Rearing Laboratory, State Police Drive, West Trenton, NJ, (3) USDA Forest Service, Forest Health Protection, 200 Weaver Boulevard, Asheville, NC

The hemlock woolly adelgid, Adelges tsugae, poses a major threat to hemlocks in the eastern U.S. This invasive and exotic insect pest has caused tremendous mortality of hemlocks in the northeastern U.S. and threatens the hemlocks in the southern Appalachians. Extensive biological control efforts have been directed at this pest. One of the introduced biological control agents (a lady beetle, Sasajiscymnus tsugae) is being reared at several facilities in the eastern and southern U.S. for release in adelgid-infested forests. Egg releases have been proposed (NJDA) as an alternative to adult releases and are expected to save time and expenses associated with rearing. This two-year study investigated the efficacy of egg releases as a viable strategy for establishment of S. tsugae. From these data, an egg release protocol was developed to enhance biological control efforts against hemlock woolly adelgid.

Species 1: Hemiptera Adelgidae Adelges tsugae (hemlock woolly adelgid)
Species 2: Coleoptera Coccinelllidae Sasajiscymnus tsugae