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Post-harvest insect infestation in maize grain stored in woven polypropylene and in hermetic bags

Published online by Cambridge University Press:  01 March 2013

Kukom Edoh Ognakossan ,
Agbéko Kodjo Tounou ,
Yendouban Lamboni  and
Kerstin Hell
Kukom Edoh Ognakossan
Affiliation:
Ecole Supérieure d'Agronomie, Université de Lomé, BP1515, Lomé, Togo International Institute of Tropical Agriculture (IITA), BP 08-0932 Tri Postal Cotonou, Republic of Benin
Agbéko Kodjo Tounou
Affiliation:
Ecole Supérieure d'Agronomie, Université de Lomé, BP1515, Lomé, Togo
Yendouban Lamboni
Affiliation:
International Institute of Tropical Agriculture (IITA), BP 08-0932 Tri Postal Cotonou, Republic of Benin
Kerstin Hell*
Affiliation:
International Institute of Tropical Agriculture (IITA), BP 08-0932 Tri Postal Cotonou, Republic of Benin
*
* E-mail: k.hell@cgiar.org
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Abstract

Maize was artificially infested with either 10 or 25 individual Prostephanus truncatus (Horn) and Sitophilus zeamais (Motschulsky) or a mixture of both, and stored in a hermetic grain bag (HGB) or a woven polypropylene bag (WPB) for 150 days. Population growth of P. truncatus and S. zeamais during storage was low in HGB, while in WPB, the insect population increased significantly with storage duration. Mortality rate during storage was significantly higher in HGB than in WPB. After 60 days of storage, the average mortality rate of 99.50% was observed in HGB infested with 25 P. truncatus, and 100% for S. zeamais at the same infestation density after 90 days of storage. Grain losses were significantly lower in HGB compared with WPB. Less than 0.5 and 6.0% losses were obtained, respectively, for S. zeamais and P. truncatus in HGB infested with 25 individual insects after 150 days of storage, whereas losses of 19.2% (infestation with S. zeamais) and 27.1% (infestation with P. truncatus) were observed in WPB. HGB seems to be resistant to the perforation of S. zeamais, but not to P. truncatus. The moisture content of maize grains stored in HGB remained practically the same during storage, compared with the levels in WPB, which reduced with storage time. WPB could be used for maize storage, protecting it against insect infestation without the need for insecticide use.

Keywords

hermetic grain bagshermetic storagepopulation dynamicsgrain lossesmortality rate, S. zeamaisP. truncatus
Type
Research Papers
Information
International Journal of Tropical Insect Science , Volume 33 , Issue 1 , March 2013 , pp. 71 - 81
Copyright
Copyright © ICIPE 2013

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