Quantitative assessment of biotic mortality factors of the european corn borer (lepidoptera: crambidae) in field corn

Mpho W. Phoofolo, John J. Obrycki, Leslie C. Lewis

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Five treatments were used to exclude naturally occurring predators and parasitoids, based on body size and flight ability, to assess their effect on Ostrinia nubilalis (Hübner) populations on corn plants. Two initial O. nubilalis egg densities (one egg mass and three egg masses per plant) were assigned to each treatment. Egg predation was higher in uncaged treatments than in caged treatments. Flying insect predators, primarily Coleomegilla maculata DeGeer (Coleoptera: Coccinellidae), reduced egg densities by 50%. Thirty-five to 84% of O. nubilalis larvae were infected with Nosema pyrausta (Paillot) (Microspora: Nosematidae). The incidence of Beauveria bassiana (Balsamo) Vuillemin (Deuteromycotina: Hyphomycetes), ranged from 0 to 21%, whereas larval parasitism, mainly by Macrocentnis cingulum Reinhard (Hymenoptera: Braconidae) ranged from 0 to 31%. In contrast to previous studies, this 3-yr field study documents that egg predation and larval infections of O. nubilalis were significant and consistent biotic mortality factors.

Original languageEnglish
Pages (from-to)617-622
Number of pages6
JournalJournal of Economic Entomology
Volume94
Issue number3
DOIs
StatePublished - 2001

Keywords

  • Biological control
  • Coleomegilla maculata
  • Natural control
  • Nosema pyrausta
  • Ostrinia nubilalis
  • Predation

ASJC Scopus subject areas

  • Ecology
  • Insect Science

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