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DOI:
10.4314/jab.v93i1.6Keywords:
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Main Article Content
Biodemographic and live cycle development comparison of three genetic populations of <i>Tribolium castaneum</i> Herbst (Coleoptera, Tenebrionidae).
Abstract
Tribolium castaneum is a cosmopolitan parasite of dry agricultural products. It is harmful and must be the subject of a rational struggle to protect grains during the storage and preservation.
Objective: The objective of this study is to evaluate cycles of development of the populations genetically differentiated.
Methodology and results: Grains of millet were placed in eight Petri dishes and infested by three (3) couples of T. castaneum aged between three to ten days for 24 hours. A follow up of the eggs from the laying up to the emergence of the adults was done in order to determine the duration of the different stages. The results showed that the T. castaneum cycle of development differ between those nondifferentiated ones. The average life development of the F1 of T. castaneum is 28.32±1.70 days in Djilas, 32.30±3.69 days in Karang and 31.07±2.23 days in Diaroume. The average life development of the F2 of T. castaneum in Djilas is 29.30±2.71 day’s 35.58±5.24 days in Karang and 33.36±4.21 days in Diaroume. Between populations genetically differentiated (Djilas and Karang on the one hand and between Djilas and Diaroume on the other hand) the gap of the cycle of development is significant. On the other, between Karang and Diaroume, two populations genetically no differentiated, the difference (gap) of the cycle of development is not significant. The sex ratio is in favour of females in the three localities and in the two generations.
Conclusion and application of results: The producers should not mix their own grain to those from markets or other localities to avoid increasing the genetic diversity or introduce short-cycle populations in their storage areas. Indeed, populations of T. castaneum from Karang and Diaroume are genetically identical and have the same development cycle. The cycle of the population of T. castaneum of Djilas (less than 30 days) is shorter than the other two populations of Karang and Diaroume (over 30 days).
Key words: Tribolium castaneum, genetic differentiation, cycle of development.
