Correlation between the genetic diversity of Sitophilus Zeamais (Mots.) and the post-harvest losses of Corn in the humid agro-climatic zone of West and Central Africa (Ivory Coast, Cameroon, Ghana, Central African Republic)
Ngagne Demba Sarr, Mama Racky Ndiaye, Jimmy gbaya, Mbacké Sembène
The main origin of the huge losses of maize stocks in Africa, particularly in the Sudano-Guinean agroclimatic zone is the methods and the means of their conservation. Our study tried to explain it also by the destructive capacities of the insect, by highlighting a correlation between the adaptive predispositions, therefore destructive of the populations of the insect which are apprehensible through their high genetic diversity and these enormous losses. The results, which could be biased by protective measures for producers, appeared to be mixed. The huge losses of maize stocks observed in Ghana indeed correspond to a strong genetic diversity of the Ghanaian population of Zealese Sitophilus, comparable to a strong adaptability. But it is the opposite in other countries (Caméroun, Central African Republic, Ivory Coast) where the enormous losses are in phase with a low genetic diversity of their populations comparable to a low resilience in these countries.