Abstract
The aim of this study was to determine the chemical composition of the essential oils of Algerian citrus. They were extracted by hydrodistillation from the leaves of citrus species (orange, Bigaradier, mandarin and lemon), using gas chromatography/mass spectrometry (GC/MS). Their chemical composition and antifungal activity against four phytopathogenic fungi (Fusarium oxysporum f.sp., albedinis sp, Penicelium sp., Alternaria sp. and Fusarium sp.) were studied. The inhibiting minimal concentration (CMI) effect was also given for four oils. Ten compounds were recorded jointly among the 51 identified, of which limonene (7.18 to 36.10%), β-pinene (4.35 to 30.0%) and linalool (0.21 to 63.03%) represent the principal major compounds. These results indicate that essential oils can be employed as natural fungicides against phytopathogenic fungi. Key words: GC/MS, essential oils , citrus, antifungal activity, phytopathogenic fungi.  
Highlights
Fungal diseases are considered as the main enemies of crops
Essential oils are extracted from the sheets of orange, Bigaradier, mandarin and lemon by hydro distillation
The outputs obtained from the essential oils are: The results obtained proved that there are qualitative similarities between the four essential oils, the quantities of some corresponding compounds are different. 10 componds were recorded jointly among the 51 identified, where limonene (7.18 - 36.10%), β- pinene (4.35 - 30.0%) and linalool (0.21 - 63.03%)
Summary
Apart from the fact that they have the potential to cause significant yield losses and deterioration of agricultural products, many of them cause a very serious risk to consumers because they produce dangerous toxins. The polemic against the use of harmful chemicals on people’. The increasing consciousness of consumers on the relationship between mode and health revolutionizes food, to justify the search for new strategies and to explore other surer solutions for replacement and biodegradable industry (Combrinck et al, 2010). For the elimination of pathogenic micro-organisms in the past years, researchers were interested in composing biologically active isolates, starting from plants with the objective of providing solutions to several challenges facing producers and agricultural distributors (Combrinck et al, 2010)
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