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Diapause initiation and incidence in the millet stem borer, Coniesta ignefusalis (Lepidoptera: Pyralidae): the role of the host plant

Published online by Cambridge University Press:  09 March 2007

P.B. Tanzubil ,
G.W.K. Mensah  and
A.R. McCaffery
P.B. Tanzubil
Affiliation:
School of Animal and Microbial Sciences, University of Reading, Reading, RG6 6AJ, UK
G.W.K. Mensah
Affiliation:
University for Development Studies, Tamale, Ghana
A.R. McCaffery
Affiliation:
School of Animal and Microbial Sciences, University of Reading, Reading, RG6 6AJ, UK
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Abstract

The role of the host plant in the development of larval diapause in the millet stem borer, Coniesta ignefusalis (Hampson) was investigated in northern Ghana in 1996 and 1997. Surveys conducted in farmers' fields in the Guinea and Sudan savannah revealed that of all the upland cereals grown, the insect survived the dry season only in stalks and stubble of pearl millet, Pennisetum glaucum and late sorghum, Sorghum bicolor. This observation was confirmed by results from field trials conducted at the Manga Research Station. In these studies, C. ignefusalis larvae entered diapause only in late millet and late sorghum, with a higher incidence in the former. The insect neither attacked nor entered diapause in maize planted during the same period as the other crops. Results from controlled experiments showed that diapause incidence in the preferred host, millet, was higher in older than in younger plants, suggesting that host plant maturation is a key factor influencing the development of larval diapause in C. ignefusalis.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 90 , Issue 4 , August 2000 , pp. 365 - 371
Copyright
Copyright © Cambridge University Press 2000

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