Biological control of Ziziphus spina-christi leaf spots and using the leaf extract against some plant diseases

Document Type : Original Article

Authors

1 Plant protection department faculty of agriculture Al-Azhar university

2 Botany Dept., Agric. Faculty, Al-Azhar Univ., Cairo, Egypt.

Abstract

The dominant Sidr variety in Siwa Oasis (thorny) was less affected than the thornless variety. A number of leaf spot-causing fungi were isolated: Alternaria alternata, Cercospora zizyphi, Cladosporium gloeosporioides, and Fusarium semitictum. Alternaria isolates were the most frequent, followed by Cercospora isolates, while Fusarium and Cladosporium isolates were the least frequent. All isolates grew successfully on all tested heavy metal salt concentrations (copper sulfate, zinc phosphate, silver nitrate). Alternaria isolates were the most tolerant, followed by Cercospora isolates, while the growth of Fusarium and Colletotrichum isolates was reduced but not stopped. Aqueous extract from Sidr leaves, at various concentrations, successfully suppressed the growth of the tested fungi. Fusarium oxsporum, followed by Fusarium solani, and then Rhizoctonia solani were the most inhibiting, while Fusarium, Aspergillus and Rhizopus are more tolerant. Ziziphus leaf extract showed its effectiveness in reducing soft rot of citrus fruits after storage at room temperature for 7 days. The rot was reduced by 68.9% with the original extract concentration, 50.3% with 50% concentration, and 39.2% with 25% concentration.

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Journal of Plant and Food Sciences
Volume 3, Issue 1
June 2025
Pages 127-137

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