Abstract
Background: Stored cereals are attacked by pests including Sitophilus, a primary insectpestthat kthe whole grain and destroys the germ. The usual control methods are less efficient and more expensive. The use of essential oils of aromatic plants is more interesting. Eucalyptus is a plant of great medicinal value due to the presence of secondary metabolites. Methods: In this experimentation that took place during the year 2017, extraction of oils by hydro distillation of eucalyptus was used on insects at different doses by two methods with are ingestion and inhalation. Two species of Sitophylus are morphologically different as they may be different with regard to the use of biopesticide (eucalyptus essential oil), regarding the mortality rate in relation to the duration of treatment Result: Sitophilus oryzae was more sensitive to this bio-pesticide since it was only after eight (08) hours of treatment that mortality exceeded 50% by the ingestion method whereas only 6.6% of mortality was recorded on Sitophilus granarius. Same observation by the inhalation method, 90% mortality on the third day for Sitophilus oryzae while only 20% mortality on Sitophilus granarius. So the ingestion method requires fewer products plus a speed in the mortality time.
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