title: [Incidence of microsporidian infection of stem borers of the genus Ostrinia (Lepidoptera: Crambidae) in the Krasnodar Territory].
abstract: Infection of corn borers of the genus Ostrinia with microsporidia is found for the first time in Russia. Incidence rates of the last instar larvae of the second generation, sampled under natural conditions in the Krasnodar Territory, is ranged between 3.0 and 17.2%. When infection incidence rates have been compared between larvae, collected (a) on the western and eastern borders of the region and (b) on dicotyledonous (cocklebur, mugwort) and monocotyledonous plants (maize), no distinct differences were found. Infection rates were maximal in larvae of Ostrinia nubilalis when its population entered the depression phase, yet it did not differ significantly from the values of the previous years. Morphometric characters of the spores allows identifying the parasite species as Nosema pyrausta. These data demonstrate wide dispersal of microsporidia in the populations of stem borers on diverse forage plants within the boundaries of the Krasnodar Territory.
authors.forename: Iu M
authors.initials: IuM
authors.lastname: Malysh
authors.forename: Iu S
authors.initials: IuS
authors.lastname: Tokarev
authors.forename: N V
authors.initials: NV
authors.lastname: Sitnikova
authors.forename: A G
authors.initials: AG
authors.lastname: Kononchuk
authors.forename: T A
authors.initials: TA
authors.lastname: Grushetskaia
authors.forename: A N
authors.initials: AN
authors.lastname: Frolov
mesh_terms: D000818:Animals; D007814:Larva / Q000382:microbiology; D007915:Lepidoptera / Q000382:microbiology*; D016818:Nosema / Q000302:isolation & purification / Q000502:physiology*; D012426:Russia