Host finding and discrimination in Diglyphus isaea, a parasitoid of the chrysanthemum leaf miner, Chromatomyia syngenesiae

Cheah, C. A. and Coaker, T. H. (1992) Host finding and discrimination in Diglyphus isaea, a parasitoid of the chrysanthemum leaf miner, Chromatomyia syngenesiae. Biocontrol Science and Technology, 2 (2). pp. 109-118.

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Abstract

Naive and experienced Diglyphus isaea were attracted by host plant odours of lettuce and chrysanthemum to search and probe on infested and uninfested leaves. A slight preference was shown for leaves infested with Chromatomyia syngenesiae. At close range, visual stimuli were unnecessary for oviposition and host‐feeding. Contact with uninfested lettuce and chrysanthemum elicited searching and probing behaviour whereas host frass did not. Host larval movement appeared to aid host detection at close range. The number of ovipositor probes increased with proximity to live hosts but not for stationary, dead hosts. Dead hosts were frequently walked over or missed when D. isaea passed within 0.5 cm of the stationary larvae. Dead hosts were also rejected for oviposition but not for host feeding. Both naive and experienced females discriminated between healthy hosts and those which had been attacked by conspecifics or encountered previously.

Item Type: Article
Additional Information: We thank Dr N. Scopes and Mrs A. Palmer while at HRI Littlehampton. Sussex for early dIscussions and provision of the initial stock cultures of the parasitoid and leaf miner. Also to Dr S. A. Corbett for comments on the manuscript.
Uncontrolled Keywords: host finding, host discrimination, Chromatomyia syngenesiae, Diglyphus isaea
Author Affiliation: Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB23EJ, UK
Subjects: Plant Protection
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 25 Apr 2012 07:39
Last Modified: 25 Apr 2012 07:39
Official URL: http://dx.doi.org/10.1080/09583159209355224
URI: http://eprints.icrisat.ac.in/id/eprint/4950

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