Résumé:
Work presented is a contribution to the study of the complex Ascochyta sp agent
responsible for the anthracnose of pea.
Sixteen stocks of Ascochyta sp collected of two areas of the Algerian West
(Mostaganem and Mascara), used in this study, and are characterized on the morphological
and farming level.
The action of certain systemic fungicides (Hexaconazole, Penconazole and
Difénoconazole) and sulfur (Fungicidal of origin mineral) are also study in order to evaluate
the mycelial growth rate and the capacity fongistatic on the germination of the spores of
Ascochyta sp.
A test of aggressiveness of the stocks of Ascochyta sp on detached pea leaves
(Merveille of kelvedon Variety) is also carried.
The results obtained show that the difénoconazole with various concentrations causes a total
inhibition on the whole of the stocks of Ascochyta sp tested.
On the other hand with the hexaconazole and the penconazole with weak concentration, one
observes a light mycelial growth. The action of micronized sulfur is noticed by a total
inhibition of the germination of the spores with 0.5g/l; with low concentration, a light rate of
germination of the spores is noted for certain isolates.
The results of the test on the aggressiveness of the stocks of Ascochyta sp on detached
leaves of the pea Merveille of kelvedon variety, watch the existence of variability enters the
stocks of Ascochyta sp.We notes the existence of four levels of aggressiveness, of the stocks
highly aggressive, aggressive, fairly aggressive and no aggressive.
