Contribution à l’étude de l’anthracnose du pois chiche (Cicer arietinum L.) causée par Ascochyta rabiei (Pass .) Labr :  Etude morphologique, culturale et physiologique de A.rabiei.  Essai in vitro de lutte chimique.

Abstract

The work presented in this memory studies Anthrracnose, diseaese of chickpea (Cicer arietinum L.) caused by Ascochyta rabiei, grave disease present in Algeria and in the world. Elavene isolates of Ascochyta rabiei collected various areas of the Algerian west, used in this study, are characterized on the morphological, cultural and physiological. The experience in laboratory by confrontation with three types of fungicides systemics (Hexaconazole, Phosétyl–Al and Penconazole) on the mycelial growth and the experience on the spore germination of the fungus A.rabiei were effected. The first phase of the work, the results obtained show the existence of morphological, cultural and physiological variability at Ascochyta rabiei. In the second part, the study of certiancs exigents ecologicals of the pathogenesis with regard the study of some physicals factors (midium of culture and the light) prove that this factors are considered as favorable factors to mycelial growth and the sporulation. The results obtained prove that we have inhibited like total for the mycelial growth of fungus.by the Penconazole to all concentration tested. To the concentration tested 0,5g/l and 1g/l for the Phosétyl-Al, 0,15ml/l and 0,3ml/l for the Hexaconazole, we constated the ralentissment of biological sequence. The second state to represented the four products fungicides are « Phosétyl-Al and Soufre micronisé » in means the total inhibited for spores germination of A.rabiei in limiting concentration tested (0,5g/l). But we have some resistance in the few concentration of this disease contradict this fungicides.