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Predator presence moves Helicoverpa armigera larvae to distraction

Johnson, M.-L. and Armitage, S. and Scholz, B.C.G. and Merritt, D.J. and Cribb, B.W. and Zalucki, M.P. (2008) Predator presence moves Helicoverpa armigera larvae to distraction. Journal of Insect Behavior, 20 (1). pp. 1-18.

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Article Link(s): http://dx.doi.org/10.1007/s10905-006-9048-x

Publisher URL: http://www.springerlink.com

Abstract

Displacement of herbivorous insects by the presence of predators on whole plants has rarely been studied. By semi-continuous observations of an externally feeding insect herbivore and a predator, we show how the mere presence of the predator, Geocoris lubra Kirkaldy (Hemiptera: Geocoridae), on a plant can have a strong influence on the movement and behaviors of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) larvae. The presence of predators, as opposed to mortality by predators, influenced the proportion of larvae feeding, resting and implementing avoidance activities. In addition, the proportion of time individual larvae allocated to feeding, resting and dropping off plants was affected when predators were present with and without contact between the two. Predators do more than just reduce numbers of herbivores; they influence feeding, displacement and subsequently the distribution of plant damage.

Item Type:Article
Additional Information:© Springer Science+Business Media, LLC.
Keywords:Big-eyed bug; foraging behavior; Geocoris lubra; Helicoverpa armigera; Heliothis; predators.
Subjects:Science > Zoology > Invertebrates > Insects
Deposited On:05 Feb 2009 05:24
Last Modified:18 Apr 2011 22:00

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