title: Impact of a North American isolate of the microsporidium Nosema carpocapsae on a laboratory population of the codling moth, Cydia pomonella.
abstract: Nosema carpocapsae is a microsporidian pathogen of the codling moth, Cydia pomonella. We report the occurrence of this pathogen in a colony originating from collections made in the United States. This is the first record of N. carpocapsae infecting North American codling moths. This North American isolate of N. carpocapsae was indistinguishable from isolates received from New Zealand and Bulgaria, based on small subunit ribosomal RNA sequencing, but was more virulent than the previously described New Zealand isolate. In the laboratory, infected larvae and pupae had increased mortality compared to their uninfected counterparts and developmental time increased by 1 week. There was no effect on female fecundity. Within a cohort of eggs laid by infected females, neonates that emerged first were more likely to be uninfected. We established an uninfected colony by interrupting horizontal transmission and only utilizing the larvae that emerged from the first-laid eggs.
authors: USDA/ARS San Joaquin Valley Agricultural Sciences Center, 9611 South Riverbend Avenue, Parlier, California 93648, USA. jsiegel@fresno.ars.usda.gov
authors: J P
authors: JP
authors: Siegel
authors: L A
authors: LA
authors: Lacey
authors: C R
authors: CR
authors: Vossbrinck
mesh_terms: D000818:Animals; D005260:Female; D007814:Larva; D008297:Male; D009036:Moths / Q000469:parasitology*; D009656:North America; D016818:Nosema / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D010802:Phylogeny