Implications of predator foraging on aphid pathogen dynamics

Journal of Invertebrate Pathology
Helen E RoyP G Alderson

Abstract

The foraging behavior of starved and nonstarved second and fourth instar Coccinella septempunctata larvae on dead Acyrthosiphon pisum aphids, either infected with the entomopathogenic fungus Erynia neoaphidis (sporulating) or uninfected, was examined. Larvae searched for longer and fed less when presented with infected rather than uninfected A. pisum. Although no sporulating infected aphids were completely consumed, both adult and larval ladybirds can still be considered as intraguild predators. In a further study, fourth instar larvae fed on dying infected, dead infected (not sporulating), and dead uninfected aphids for similar periods of time but again the infected aphids were seldom entirely consumed. Live uninfected aphids were fed upon for significantly longer than any other prey. Infected aphids which were damaged at an early stage of infection (0, 1, or 2 days after inoculation) did not sporulate, whereas damaged moribund aphids (3 days after inoculation) did subsequently sporulate. Damaged sporulating cadavers continued to sporulate. However, damage to moribund and sporulating infected aphids, both mechanical or due to C. septempunctata feeding, reduced the number of conidia subsequently produced. Larval feeding caused ...Continue Reading

References

Nov 1, 1990·Trends in Ecology & Evolution·M E Hochberg, J H Lawton
May 1, 1992·Trends in Ecology & Evolution·G A Polis, R D Holt

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Citations

Dec 8, 2005·Annual Review of Entomology·H E RoyJ K Pell
Mar 18, 2008·Journal of Invertebrate Pathology·J BaverstockJ K Pell
Nov 8, 2007·The Journal of Animal Ecology·F J F Van VeenH C J Godfray
Jul 18, 2006·Journal of Invertebrate Pathology·Nicolai V MeylingJørgen Eilenberg
Jul 26, 2005·Journal of Invertebrate Pathology·J BaverstockJ K Pell
Apr 15, 2015·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Joël Meunier
Nov 6, 2021·Ecology Letters·Robert L RichardsVanessa O Ezenwa

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