Host plant and substrate effects on mortality of southern corn rootworm from entomopathogenic nematodes

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Bioassays were conducted to determine the effects of host plant and substrate type on the susceptibility of Diabrotica undecimpunctata howardi larvae (southern corn rootworm) to entomopathogenic nematodes. Larvae were reared on corn, peanuts, and two squash species. One squash species produces bitter cucurbitacin E, whereas the second squash lacks these secondary compounds. Nematodes of the species Heterorhabditis bacteriophora (Lewiston strain) and Steinernema carpocapsae (Mexican strain) were applied at two concentrations in assays conducted in soil and sand to which rootworm larvae were transferred from different host plants. Host plants and substrate type significantly affected larval susceptibility to both nematode species. The hypothesis that ingested cucurbitacins serve as defense compounds for diabroticites was not supported by the results obtained in this study. D. undecimpunctata howardi larvae suffered higher mortality when reared on both squash species compared to larvae reared on corn or peanuts. Mortality caused by H. bacteriophora was significantly higher in soil than in sand. Generally, S. carpocapsae caused 10 times greater mortality than H. bacteriophora.

Original languageEnglish (US)
Pages (from-to)89-96
Number of pages8
JournalBiological Control
Volume8
Issue number2
DOIs
StatePublished - Jan 1 1997

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Diabrotica undecimpunctata howardi
entomopathogenic nematodes
squashes
host plants
Heterorhabditis bacteriophora
larvae
cucurbitacins
Steinernema carpocapsae
peanuts
Nematoda
sand
rootworms
corn
soil
bioassays
assays

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Insect Science

Cite this

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title = "Host plant and substrate effects on mortality of southern corn rootworm from entomopathogenic nematodes",
abstract = "Bioassays were conducted to determine the effects of host plant and substrate type on the susceptibility of Diabrotica undecimpunctata howardi larvae (southern corn rootworm) to entomopathogenic nematodes. Larvae were reared on corn, peanuts, and two squash species. One squash species produces bitter cucurbitacin E, whereas the second squash lacks these secondary compounds. Nematodes of the species Heterorhabditis bacteriophora (Lewiston strain) and Steinernema carpocapsae (Mexican strain) were applied at two concentrations in assays conducted in soil and sand to which rootworm larvae were transferred from different host plants. Host plants and substrate type significantly affected larval susceptibility to both nematode species. The hypothesis that ingested cucurbitacins serve as defense compounds for diabroticites was not supported by the results obtained in this study. D. undecimpunctata howardi larvae suffered higher mortality when reared on both squash species compared to larvae reared on corn or peanuts. Mortality caused by H. bacteriophora was significantly higher in soil than in sand. Generally, S. carpocapsae caused 10 times greater mortality than H. bacteriophora.",
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Host plant and substrate effects on mortality of southern corn rootworm from entomopathogenic nematodes. / Eben, Astrid; Barbercheck, Mary Ellen.

In: Biological Control, Vol. 8, No. 2, 01.01.1997, p. 89-96.

Research output: Contribution to journalArticle

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