Effect of post-harvested rice conservation on Sitophilus oryzae L. in Côte d’Ivoire
Journal Title: International Journal of Farming and Allied Sciences - Year 2016, Vol 5, Issue 7
Abstract
Harvested rice in rural area in Côte d’Ivoire is stored under four main modalities: Husked and Not Parboiled Rice (HNPR), Husked and Parboiled Rice (HPR), Not Husked and Not Parboiled Rice (NHNPR) and Not Husked and Parboiled Rice (NHPR). The effect of rice treatments on S. oryzae population dynamics was thus assessed based on parameters such as the number of living individuals counted at each observation period, the evolution of the population biomass, the evolution of the cumulative percentage of mortality over time and depending on sex. Laboratory studies on some population dynamics parameters of Sitophilus oryzae L. (Coleoptera : Curculionidae) depending on these four rice conservation modalities, showed that only the (HNPR) treatment allowed a significant population growth and an important increase of the living biomass of this pest. In addition, high S. oryzae mortality rates were observed when the insect was reared on the three other rice conservation modalities. Besides, more than 50% of insect parents died during the first forty five days of the tests when the insects were reared on HPR, NHNPR and NHPR. These results will allow the conception of non-chemical management methods based on the bioecology of this pest.
Authors and Affiliations
Mamadou Doumbia, Bleu G. Douan, Véronique Martel, Koffi E. Kwadjo, Dagobert K. Kra , Mamadou Dagnogo
Keywords
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