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The movement and distribution of Helicoverpa armigera (Hübner) larvae on pea plants is affected by egg placement and flowering

Published online by Cambridge University Press:  27 May 2010

L.E. Perkins ,
B.W. Cribb ,
J. Hanan  and
M.P. Zalucki
L.E. Perkins*
Affiliation:
The University of Queensland, School of Biological Sciences, St Lucia, Australia, 4072
B.W. Cribb
Affiliation:
The University of Queensland, School of Biological Sciences, St Lucia, Australia, 4072 The University of Queensland, Centre for Microscopy & Microanalysis, St Lucia, Australia, 4072
J. Hanan
Affiliation:
The University of Queensland, Centre for Biological Information Technology, St Lucia, Australia, 4072
M.P. Zalucki
Affiliation:
The University of Queensland, School of Biological Sciences, St Lucia, Australia, 4072
*
*Author for correspondence Fax: +61 7 3365 1655 E-mail: [email protected]
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Abstract

The distribution and movement of 1st instar Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) larvae on whole garden pea (Pisum sativum L.) plants were determined in glasshouse trials. This economically-important herbivore attacks a wide variety of agricultural, horticultural and indigenous plants. To investigate the mechanisms underlying larval intra-plant movement, we used early-flowering and wild-type plant genotypes and placed eggs at different vertical heights within the plants, one egg per plant. Leaf water and nitrogen content and cuticle hardness were measured at the different plant heights. Of 92 individual larvae, 41% did not move from the node of eclosion, 49% moved upwards and 10% moved downwards with the distance moved being between zero and ten plant nodes. Larvae from eggs placed on the lower third of the plant left the natal leaf more often and moved further than larvae from eggs placed in the middle or upper thirds. The low nutritive value of leaves was the most likely explanation for more movement away from lower plant regions. Although larvae on flowering plants did not move further up or down than larvae on non-flowering plants, they more often departed the leaflet (within a leaf) where they eclosed. The final distribution of larvae was affected by plant genotype, with larvae on flowering plants found less often on leaflets and more often on stipules, tendrils and reproductive structures. Understanding intra-plant movement by herbivorous insects under natural conditions is important because such movement determines the value of economic loss to host crops. Knowing the behaviour underlying the spatial distribution of herbivores on plants will assist us to interpret field data and should lead to better informed pest management decisions.

Keywords

behaviourfirst instarsintra-plant movementplant attributes
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 5 , October 2010 , pp. 591 - 598
Copyright
Copyright © Cambridge University Press 2010

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