Location: Beneficial Insects Introduction Research
2013 Annual Report
1: Explore for natural enemies (parasitoids) of EAB in its native range and evaluate their suitability for introduction. 1a - Explore for parasitoids of EAB in its native range. 1b - Evaluate the suitability of discovered parasitoid for introduction to North America for EAB control. 2: Evaluate impacts of extant (indigenous) and previously introduced parasitoids on populations of EAB, particularly in northeastern and/or Midwestern states. 3: Develop effective mass rearing technologies for hymenopteran parasitoids of EAB and other invasive pests. 3a - Determine the key life history parameters of the concerned parasitoid species. 3b - Determine the optimal host stage and host density (or host to parasitoid exposure ratio). 3c - Determine the optimal environmental conditions for adult parasitoid survival, oviposition, and progeny development.
In collaboration with USDA Forest Service (FS) and Animal and Plant Health Inspection Service (APHIS), Maryland Department of Agriculture, University of Maryland, and University of Massachusetts, six study sites in Michigan and four sites in Maryland have been continuously surveyed for evaluation of impacts of three previously introduced parasitoids (Tetrastichus planipennisi, S. agrili, and O. agrili). Results from the field study in Michigan showed that by the fall of 2012, 92% and 83% of sampled trees had one or more broods of T. planipennisi (released between 2007 – 2010) in the parasitoid-release and control plots. The rates of EAB larval parasitism by T. planipennisi were 21.2% in the parasitoid-release plots and 12.8% for the control plots by the fall of 2012. In contrast, no parasitism by S. agrili was detected in both release and control plots, and low rates (2 – 10%) of parasitism by O. agrili was primarily found in the parasitoid-release sites. These findings demonstrate that T. planipennisi is established in southern Michigan and that its populations are increasing and expanding. Data from Maryland field studies also showed that the biocontrol agent T. planipennisi was frequently recovered with a rate of parasitism ranging from 5 – 15% from several release sites, where the adult parasitoids had been released between 2010 and 2011. However, no parasitism by S. agrili or O. agrili was recovered from field samples in spring of 2013. This indicates that more time and releases are needed in Maryland for those newly introduced biocontrol agents to establish increasing populations on EAB.
QUARANTINE SERVICES: A total of 78 permitted consignments were received by the Quarantine Facility, consisting of 15,117 pest specimens, and 688 parasitoids in the genus Oobius. A total of 39 outgoing shipments, 1430 pest specimens, and 11,365 parasitoids in 6 genera. Five identification requests and two paratypes of Trissolcus halyomorphae were provided to the ARS Systematic Entomology Laboratory.
Yang, S., Duan, J.J., Lundgren, J., Van Driesche, R. 2012. Multiparasitism by Tetrastichus planipennisi (Hymenoptera: Eulophidae) and Spathius agrili (Hymenoptera:Braconidae): Implication for biological control of the Emerald Ash Borer (Coleoptera: Buprestidae). Biological Control. 65:118-123.
Duan, J.J., Taylor, P.B., Fuester, R.W., Kula, R.R., Marsh, P.M. 2013. Hymenopteran Parasitoids Attacking the Invasive Emerald Ash Borer (Coleoptera: Buprestidae) in Western and Central Pennsylvania. Florida Entomologist. 96:166-172.
Duan, J.J., Bauer, L., Abell, K., Lelito, J., Van Driesche, R. 2013. Establishment and abundance of Tetrastichus planipennisi (Hymenoptera: Eulophidae) in Michigan: potential for success in classical biocontrol of the invasive emerald ash borer (Coleoptera: Buprestidae). Journal of Economic Entomology. 106:1145-1154.