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The effect of natural enemies on the spread of barley yellow dwarf virus (BYDV) by Rhopalosiphum padi (Hemiptera: Aphididae)

Published online by Cambridge University Press:  09 March 2007

I.N. Smyrnioudis ,
R. Harrington ,
S.J. Clark  and
N. Katis
I.N. Smyrnioudis
Affiliation:
Plant and Invertebrate Ecology DivisionIACR-Rothamsted, Harpenden, Herts, AL5 2JQ, UK Aristotle University, Faculty of Agriculture, 540 06 Thessaloniki, Greece
R. Harrington*
Affiliation:
Plant and Invertebrate Ecology DivisionIACR-Rothamsted, Harpenden, Herts, AL5 2JQ, UK
S.J. Clark
Affiliation:
Biomathematics Unit, IACR-Rothamsted, Harpenden, Herts, AL5 2JQ, UK
N. Katis
Affiliation:
Aristotle University, Faculty of Agriculture, 540 06 Thessaloniki, Greece
*
*Fax: +44 1582 760981 E-mail: [email protected]
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Abstract

The effects of two natural aphid enemies, adult Coccinella septempunctataLinneaus, a predator, and Aphidius rhopalosiphi de Stefani Perez, a parasitoid, on spread of barley yellow dwarf virus (BYDV) transmitted by the bird cherry–oat aphid, Rhopalosiphum padi (Linnaeus) were studied under laboratory conditions. Predators or parasitoids were introduced to trays of durum wheat seedlings and the patterns of virus infection were observed after two, seven and 14 days of exposure. More plants were infected with BYDV in control trays without A. rhopalosiphithan in trays with the parasitoid present, both seven and 14 days after the introduction of parasitoids. Patterns of virus infection were found to be similar over time in trays with a parasitoid present and in control trays. More plants were infected in trays with C. septempunctata present than in control trays, both two and seven days after the introduction of the coccinellid. The spread of virus infections progressed differently over time for the two treatments (predator and parasitoid), differences between treatments being most marked after two days and seven days, when more plants exposed to predators but fewer exposed to parasitoids were infected with BYDV compared to their respective controls. However, by the 14th day 88% of all plants were infected and there was no significant difference between the two treatments. The role of natural enemies in spread of BYDV is discussed.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 91 , Issue 4 , August 2001 , pp. 301 - 306
Copyright
Copyright © Cambridge University Press 2001

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