الفعالية التثبيطية لعدد من المستخلصات النباتية ضد الفطر Alternaria alternate كأحد مسببات مرض تبقع أوراق نخيل التمر Phoenix dactylifera L.

Abstract EN

The present study has been conducted at the labrotary of Date palm Research Center –University of Basrah to evaluates the efficiency of differants plant extract which were Conocarpus lancifolius (Damass) , Ricinus communis (Castor beans).Nerium oleandra(Nerium).Clerodendron inerme(Blue jasmine) was to control the fungus Alternaria alternata the causal agent of leaves spots of Date Palm (Phoenix dactylifera ) were as follow ; In vitro and in vivo .

In in vitro study ;the leaf extract of C.

lancifolius reported the higest average of reduction for mycelial growth which were 71.11,72.22 and 78.88% at the concentration of 5.10 and 15 % respectively .Regarding the treatment of R.communis 10 and 15 % concentrations the inhibition percentage were 72 and 74.44 % respectively .Fieled trail revealed highest reduction of disease severity was found at the treatment of C.

lancifolius extract at 5,10and 15% which were 34.17, 25.67 and 14.3 % respectively , compard to infected control which was 65.16 % .All treatments with plant extracts has significantly reduced the disease severity of leaves spots compard to infected control trearment under fieled conditions.