Abstract
The research was conducted at the laboratories of the College of Agriculture, at Karbala University. The main aim of this study was to identify and isolate fungi for grape rot and spoilage seen in marketplaces and storage facilities. Additionally the researchers examined the pathogenicity of these fungi testing concentrations of gum Arabic and frankincense to see their impact on grape rot causing fungi. The results of isolation and diagnosis revealed the presence of the fungal species Fusarium(T2), Aspergillus(T4), Geotrichum(T1), Populaspora(T3), and Phytophthora(T5) in all areas from which samples were collected, including Al-Hindiya, Al-Husseiniya, and Al-Khayrat. The results showed that all tested isolates caused a significant increase in the percentage severity of infection under laboratory conditions. The fungi Fusarium and Aspergillus showed the highest percentage severity of infection, reaching 82% and 80%, respectively, followed by Geotrichum with a percentage severity of 75%, compared to other treatments and the control treatment, which had a percentage severity of 0.00%.The results also noted that most treatments significantly affected the growth of fungal isolates on the PDA culture medium. The percentage inhibition fungal growth of (T5) was highest 44.44% with treatment of 15% concentration of frankincense and gum Arabic separately follow by (T4) treated with 15% concentration of frankincense and (T1) treated with 15% concentration of gum Arabic. In contrast, the lowest inhibition fungual growth of fungi was 14.30% for (T3) and (T2, T3) treated with frankincense and gum Arabic respectively compared with other treatments.