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Evaluation of Spodoptera exempta nucleopolyhedrovirus (SpexNPV) for the field control of African armyworm (Spodoptera exempta) in Tanzania.

Grzywacz, David and Mushobozi, Wilfred L. and Parnell, Mark and Jolliffe, Flavia and Wilson, Kenneth (2008) Evaluation of Spodoptera exempta nucleopolyhedrovirus (SpexNPV) for the field control of African armyworm (Spodoptera exempta) in Tanzania. Crop Protection, 27 (1). pp. 17-24. ISSN 0261-2194

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Abstract

The African armyworm Spodoptera exempta is a major episodic migratory crop pest over much of Eastern and Southern Africa. Control of this pest has been reliant on the use of synthetic chemical insecticides. However, this approach fails to protect poor farmers and is becoming unacceptable for environmental and cost reasons. A programme of field trials was conducted in Tanzania to evaluate the endemic baculovirus, the S. exempta nucleopolyhedrovirus (SpexNPV), as an alternative control. Field trials demonstrated that both ground and aerial application of SpexNPV to armyworm outbreaks on pasture can initiate outbreaks of NPV disease and population collapses. The SpexNPV was effective when applied at 1×1012 occlusion bodies (OB) per hectare if applied to outbreaks early, when larvae are in I–III instar—mass mortalities appear 3–10 days post treatment. The data from these trials indicate that SpexNPV can have a potential role as a substitute for chemical insecticides in strategic armyworm management programmes.

Item Type: Article
Journal or Publication Title: Crop Protection
Uncontrolled Keywords: Spodoptera exempta ; African armyworm ; Migratory pest ; Baculovirus ; Nucleopolyhedrovirus ; Biological control ; IPM ; Africa
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 9001
Deposited By: Dr Kenneth Wilson
Deposited On: 21 May 2008 14:09
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:30
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9001

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