Evaluation of Parasitoid Guilds and Their Contribution to Mortality of the Emerald Ash Borer in Its Native Range, Northeastern China
Beneficial Insects Introduction Research
2013 Annual Report
1a.Objectives (from AD-416):
(1) Survey and collection of natural enemies (parasitoids) associated with emerald ash borers and buprestids infesting ash (Fraxinus spp) trees; (2) Import natural enemies to U.S. for quarantine evaluation; and (3) Investigate the role of natural enemies in regulating the pest populations.
1b.Approach (from AD-416):
Investigate natural enemies of emerald ash borers on girdled ash trees in Russia at several suitable study sites determined from the previous study. Inventory and collect natural enemies attacking the target pest, assess role in population dynamics of pest, set priorities for importation, and ship promising species to Newark for further study. Monitor and sample selected sites intensively to determine the role of natural enemies in population dynamics. Hand carry or ship by air freight, natural enemies to U.S.
We made a site visit in September of 2012 to Yilin Forest Farm of Yichun City, where 12 Manchurian ash trees had been girdled in Spring of 2012 to attract emerald ash borers and associated natural enemies. Upon examining the crown condition of those girdled trees and a survey of bark for emerald ash borer eggs, we found few signs of EAB infestation and decided to leave the girdled trees for one more growing season (through summer of 2013). Plans have been made to sample those girdled trees for EAB population and associated egg and larval parasitoids in the fall of 2013.