Incidence and distribution of the stem borer, Coniesta ignefusalis (Hampson) (Lepidoptera: Pyralidae), in cereal crops in northern Ghana
2000
Tanzubil, P.B., Savanna Agricultural Research Institute, Council for Scientific and Industrial Research, P. 0.Box 46. Bawku. Ghana | Mensah, G.W.K., University for Development Studies, P. 0. Box 350, Tamale,Ghana
Studies were conducted on the incidence and geographical distribution of the stem borer Coniesta ignefusatis (Hampson) in the millet belt of northern Ghana between 1996 and 1997. Results clearly showed the existence of the insect at all locations surveyed, but with a higher incidence in the Sudan savanna. The insect was more abundant on millet followed by sorghum, and stalks of these cereals provide refuge for diapause larvae and thus contrihute to population carry-over from one season to another. Though maize stalks and stubble showed signs of stem borer attack. no C. ignefusalis larvae were extracted from them. suggesting that maize is not very important In the population ecology of the insect. It is concluded trom the studies that proper management of cereal stalk and stubble alter harvest could help reduce the population carry-over of the insect from one season to another. Additionally, growing maize in rotation or in association with millet could be a useful tool for reducing C. ignefusalis incidence and damage in the millet-based farming systems of northern Ghana.
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