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Distribution and Seasonal Incidence of Some Major Insect Pests of Sorghum in Burkina Faso*

Published online by Cambridge University Press:  19 September 2011

Kanayo F. Nwanze
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Sahelian Center, BP 12404, Niamey, Niger

Abstract

This paper reports the results of extensive pest surveys conducted on farmers' fields and pest population studies at two national research stations between 1979 and 1981 in Burkina Faso. Major findings indicate that, under normal planting conditions, infestation of the sorghum shootfly, Atherigona seccata is very low in farmers' fields. This pest appears to be restricted to research stations. Stem borer infestation is caused by a complex of species, and species predominance varies with rainfall. South of latitude 12°N, Busseola fusca is the predominant species but further north it is replaced by Acigona ignefusalis, which is a primary pest of pearl millet. Panicle damage caused by the sorghum midge, Contarinia sorghicola, varies with season; is usually very low in the dry northern Sahelian zone but severe south of latitude 13°N. Maximum midge populations occurred between mid-September and early October.

Résumé

Cet article présente les résultats des enquêtes extensives sur les insectes nuisibles réalisées en champs paysans et dans le cadre des études de population des ravageurs à deux stations de recherche nationales entre 1979 et 1981 au Burkina Faso. La plupart des résultats indiquent que dans des conditions de culture normales, l'infestation de la mouche des pousses du sorgho, Atherigona seccata est très faible en champs paysans. Cet insecte nuisible semble être limité aux stations de recherche. Linfestation par le borer des tige du sorgho est occasionnée par un complexe d'espèces dont la prédominance varie avec la pluviométrie. Au sud de la latitude 12°N, Busseola fusca est l'espèce la plus importante tandis qu'au plus nord elle est remplacée par Acigona ignefusalis, qui est le principal ravageur du mil. Les dégâts causés aux panicules par la cécidomyie du sorgho, Contarinia sorghicola, varient avec la saison. En général, ils sont très faibles dans la région sèche du Sahel du nord mais plus importants au sud de la latitude 13°N. La population de cécidomyies a atteint son niveau maximum entre la mi-septembre et début octobre.

Type
Research Articles
Copyright
Copyright © ICIPE 1988

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References

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Distribution and Seasonal Incidence of Some Major Insect Pests of Sorghum in Burkina Faso*
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