Entomologia Experimentalis et Applicata (2008) 128, 154-161

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G.O. Ong'amo, B.P. Le Rü, P. Moyal, P.-A. Calatayud, P. Le Gall, C.P.K.O. Ogol, E.D. Kokwaro, C. Capdevielle-Dulac and J.-F. Silvain (2008)
Host plant diversity of Sesamia calamistis: cytochrome b gene sequences reveal local genetic differentiation
Entomologia Experimentalis et Applicata 128 (1), 154-161
Abstract: Sesamia calamistis Hampson (Lepidoptera: Noctuidae) is one of the indigenous stem borer pests associated with maize (Zea mays L.) and sorghum [Sorghum bicolor (L.) Moench] (both Poaceae) in Africa. Its pest status varies across the continent and this has been attributed to variation in diet breadth and ecological preferences among populations. Its larvae were found on 12 plant species during a study initiated at four sites (Muhaka, Mtito Andei, Kakamega, and Suam) in Kenya to estimate its diet breadth and genetic population structure. Ten of the infested plant species belonged to the family Poaceae [Echinochloa haploclada (Stapf) Stapf, Eleusine corocana L., Eleusine jaegeri Pilg., Panicum deustum Thunb, Panicum maximum Jacquin, Pennisetum purpureum Schumacher, Setaria verticillata (L.) P. Beauv., Sorghum arundinaceum (Desvaux) Stapf, S. bicolor, and Z. mays]; the other two were Cyperaceae: Cyperus distans L. and Cyperus dives Delile. Combined with collections from other African countries (Uganda, South Africa, Benin, Ghana, Nigeria, and Togo), comparisons of partial cytochrome b sequences revealed the presence of 68 haplotypes that differentiated into clades I and II. In Kenya, the two clades colonized different regions, except in Mtito Andei where they co-existed. Individuals from Mtito Andei could be separated based on their host plants: clade I with 14 haplotypes was found mainly on maize (78.6%), whereas clade II with 10 haplotypes was found mainly among wild host plants (63.6%). Detection of divergence among these clades with cytochrome b suggests that their evolutionary separation may have taken place about one million years ago. This article discusses the potential implication of this differentiation for the management of S. calamistis as a pest of maize and sorghum in Africa.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): George Otieno Ong'amo, Paul-Andre Calatayud, Callistus K.P.O. Ogol, Elizabeth Kokwaro

Research topic(s) for pests/diseases/weeds:
molecular biology - genes
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Sesamia calamistis Benin
Sesamia calamistis Ghana
Sesamia calamistis Nigeria
Sesamia calamistis Togo
Sesamia calamistis Uganda
Sesamia calamistis South Africa
Sesamia calamistis Maize/corn (Zea mays) Kenya
Sesamia calamistis Sorghum (crop) Kenya
Sesamia calamistis Pennisetum (crop) Kenya
Sesamia calamistis Eleusine (crop) Kenya