ملخص البحث :
The study included the isolation and diagnosis of the associated fungi to dampingoff
and the root rot disease of the Acacia plants and evaluating the effectiveness of some
biological agents in controlling the disease in vitro. The results of isolation and diagnosis
from the infected roots of Acacia plant showed the presence of the two pathogenic fungi
(Rhizoctonia solani and Fusarium solani), which appeared frequently in all samples brought
from some nurseries in Babylon province. The isolates of two pathogenic fungi (R. solani
and F. solani) affected the germination of Acacia seeds which led to occurring a significant
excelling through raising the intensity of the infection with two pathogenic fungi (R. solani
and F. solani) which amounted to 83.33 and 41.66%, respectively, compared to the control
treatment, in which the intensity of the infection amounted to zero. The two fungi had also
significantly reduced the dry and fresh weights of the total vegetative and root system. The
results of the antagonistic potential test for the fungus (Trichoderma harzianum) showed
high efficiency in inhibiting the two pathogenic fungi, which achieved an antagonistic
potential on the PSA media. Azospirillum sp. bacteria showed high antagonistic potential
in inhibiting the two pathogenic fungi (R. solani and F. solani) with a percentage of 64.1
and 61.1, respectively. The aqueous extract for the plants (fruits of castor, leaves, and
flowers of Clerodendrum inerme, garlic oil) showed an effective effect in inhibiting the
pathogenic fungi on the PSA. The extract of the castor fruit plant gave better efficiency
than rest of the extracts where the percentage of inhibition to the two pathogenic fungi for
the aqueous extract for the castor plant at a concentration of 15% amounted to 56.66 and
54.81%, respectively.
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سنة النشر : 2018
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تصنيف البحث : scopus
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