تقويم فعالية المستخلص المائي الحار لبعض النباتات الطبية في نمو فطريات التربة الممرضة Fusarium oxysporium و Rhizoctonia solani تحت درجات حرارة مختلفة مختبريا

Abstract

A laboratory study was carried out to test the effect of hot aqueous extract of Piper nigrum, Syzygyum aromatium and Curcuma longa in the growth of soil fungi pathogenic F. oxysporium and Rhizoctonia solani . The results showed significant effect evident in the inhibitory activity of Piper nigrum and Syzygyum aromatium extracts against the growth of colonies diameters of F. oxysporium which were 6.6, 4.1, 0,0 cm and 7.2, 5, 3.1,0 cm at 1, 2, 3, 5 % concentrations respectively compared to the control treatment which was 9 cm. While the results showed significant effect of Curcuma longa extract against the growth of colonies diameters of Rhizoctonia solani were 7.3, 4.4,1.3,0cm compared to the control treatment which was 9 cm.And for the extracts concentration, the concentration 5 % showed superiority in the inhibitory activity for both fungi in all treatments. The results also showed significant effect of the heat factor in raising the efficiency of different aqueous extracts at (2 % concentration ) in the inhibition growth of both fungi. The treatments of Piper nigrum and Syzygyum aromatium have recorded significant effect in the growth of colonies diameters of F. oxysporium which were 1.1,0,0 cm for Piper nigrum and 3, 1.3, 0 cm for Syzygyum aromatium compared with control which were 5,4.2,2.9cm, while Curcuma longa extract showed high significant effect 100 % inhibition activity in the growth of colonies diameters of Rhizoctonia solani at 30,35,42 Co compared with control. According to the results of this study recommend that the possibility of using Piper nigrum and Syzygyum aromatium extracts as a natural materials having inhibitory activity against F. oxysporium and using Curcuma longa extract against Rhizoctonia solani , also recommend to benefit of heat as a physicist factor to increase inhibitory activity of these extracts.