Abstract

AbstractThe apple leaf midge,Dasineura mali(Kieffer) (Diptera: Cecidomyiidae), an invasive alien pest established for many years in Nova Scotia, Canada, has invaded Ontario and British Columbia, Canada apple (Malus domesticaBorkhausen; Rosaceae) orchards, damaging growing tips of trees. Molecular analysis indicated that Nova Scotia populations are genetically different from Ontario and British Columbia populations. Pheromone trap captures, oviposition on growing apple terminals, and the incidence of third instars indicate threeD. maligenerations in each province.Platygaster demadesWalker (Hymenoptera: Platygastridae), released in Nova Scotia in 1993, parasitised 34% of the third midge generation in that province and was reared fromD. malifor the first time in 2016 in the Fraser Valley of British Columbia.Lyrcus nigroaeneusAshmead (Hymenoptera: Pteromalidae) parasitised up to 21% ofD. maliin southwestern Ontario.Synopeas myles(Walker) (Hymenoptera: Platygastridae) was recorded fromD. malifor the first time, one specimen in each of Nova Scotia and Ontario, and was the most important parasitoid in British Columbia.Synopeas mylesparasitism in Okanagan and Similkameen, British Columbia orchards increased from 0% to a mean of 30% ofD. malilarvae from 2014 to 2016. Other minor parasitoids includedPlatygaster tuberosulaKieffer (Hymenoptera: Platygasteridae) in all three provinces andAphanogmus vicinusFörster (Hymenoptera: Ceraphronidae) in British Columbia.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.