كفاءة بعض الفطريات في المقاومة الاحيائية لحشرة مّن الباقلاء الأسود Aphis fabae Scopol(Homoptera :Aphididae)‎ على نبات الباقلاء Vicia fabae

Abstract EN

This study was contucted to test the efficiency of some fungi , which isolated from Black Bean Aphid Aphis fabae in the control of this insect in the field.

Ten different spicies belonging to six genera were isolated from different Aphids stars as follow: Alternaria alternata, Aspergillus candidus , A.

niger , A.

flavus , A.

ochraceus , A.

terreus , Emercilla vorcicolla , Fusarum sp.

, Mycellophthora sp.

and Trichoderma harzianum,in addition to Beauveria bassiana from the biological and agricultural research center L Baghdad .

The results of fungal pathogencity experiment at the lab.

elucidated the high efficiency of B.bassiana and T.

harzianum suspension of spores (106 spor / ml ) treatments , which recorded high mortality percentage reached to 89.08% and 76.31% respectively , followed by Mycellophthora sp.

treatment , while the lowest mortality percentage found in A.

ochraceus and , A.

terreus treatment.

.The results of Quantaive test of insect cutical degrading enzymes(Chitinase , Lipase and Protease) on solid media ,proved the ability of B.

bassiana , T.

harzianum to secret all tested enzymes , while the other fungi varying in their ability ,A.

ochraceus and A.

terreus gave a negative test for chitinase and protease.

At the field , the results were the same with the lab.

Experiment for the high pathogenic activity of Bbassiana , its spore suspension treatment (10 6 spore / ml) recorded mortality perecentage 51.81 %followed by T.harzianum treatment