ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROL
Several nurseries of olives in Fayoum and Giza were surveyed for root rot incidence during early summer of 2003. In Fayoum, root rot incidence reached 53% while in Giza, disease incidence was 44%. Disease symptoms consist of partial wilting, leaves browning and twig dieback, which was associated wit...
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| Format: | Article |
| Language: | Arabic |
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The Union of Arab Universities
2006-03-01
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| Series: | Arab Universities Journal of Agricultural Sciences |
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| Online Access: | https://ajs.journals.ekb.eg/article_15576_eb9a08cbd703191b7fb68bb5012b1f48.pdf |
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| author | M.S. Mousa, M.K. Ali A.A. Mosa I.S Elewa |
| author_facet | M.S. Mousa, M.K. Ali A.A. Mosa I.S Elewa |
| author_sort | M.S. Mousa, |
| collection | DOAJ |
| description | Several nurseries of olives in Fayoum and Giza were surveyed for root rot incidence during early summer of 2003. In Fayoum, root rot incidence reached 53% while in Giza, disease incidence was 44%. Disease symptoms consist of partial wilting, leaves browning and twig dieback, which was associated with severe root rot and basal stem cankers and followed, in most cases, by plant decline and death. The most frequently isolated fungi from rotted roots were Fusarium oxysporum, F. solani, F. moniliforme, Rhizoctonia solani, Sclerotium rolfsii, Cylindrocarpon sp. and Alternaria alternata. Isolation frequency of different fungi varied among olive cultivars. Generally, Fusarium spp. were the most frequently isolated pathogens and Fusarium oxysporum was the most frequent (35.5%) on all cultivars followed by F. solani (19.3%) R. solani (16.1%). Meanwhile, S. rolfsii, F. moniliforme, Cylindrocarpon sp. and A. alternata occurred at lowfrequencies. Pathogenicity tests showed that all tested isolates caused varied degrees of root rot symptoms on olive transplants, cvs. Manzanillo and Picual. Fusarium oxysporum, F. solani and R. solani caused the highest root rot incidence and severity on both cultivars. There was a positive correlation between disease severity on roots and severity of foliar symptoms. All evaluated olive cultivars were susceptible or extremely susceptible to fungal pathogens. All cultivars showed high disease severity with root rots, especially in response to infection by F. solani, F. oxysporum and S. rolfsii. However, the least foliar symptoms were recorded on cultivar Coratina. Application of two commercial biological control products (Rhizo-Plus and Trichoderma 2000) to soil, 24h before planting olive cuttings in the nursery, significantly reduced incidence of root rot on transplants of cultivars Manzanillo and Picual, up to 28 weeks after planting |
| first_indexed | 2024-04-25T01:52:29Z |
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| id | doaj.art-c9783e52b452405b90dbd2b610a3ab25 |
| institution | Directory Open Access Journal |
| issn | 1110-2675 2636-3585 |
| language | Arabic |
| last_indexed | 2024-04-25T01:52:29Z |
| publishDate | 2006-03-01 |
| publisher | The Union of Arab Universities |
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| series | Arab Universities Journal of Agricultural Sciences |
| spelling | doaj.art-c9783e52b452405b90dbd2b610a3ab252024-03-07T17:48:03ZaraThe Union of Arab UniversitiesArab Universities Journal of Agricultural Sciences1110-26752636-35852006-03-0114139540910.21608/ajs.2006.1557615576ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROLM.S. Mousa,0M.K. Ali1A.A. Mosa2I.S Elewa3Department of Plant Pathology, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Cairo, EgyptDepartment of Plant Pathology, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Cairo, EgyptDepartment of Plant Pathology, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Cairo, EgyptDepartment of Plant Pathology, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Cairo, EgyptSeveral nurseries of olives in Fayoum and Giza were surveyed for root rot incidence during early summer of 2003. In Fayoum, root rot incidence reached 53% while in Giza, disease incidence was 44%. Disease symptoms consist of partial wilting, leaves browning and twig dieback, which was associated with severe root rot and basal stem cankers and followed, in most cases, by plant decline and death. The most frequently isolated fungi from rotted roots were Fusarium oxysporum, F. solani, F. moniliforme, Rhizoctonia solani, Sclerotium rolfsii, Cylindrocarpon sp. and Alternaria alternata. Isolation frequency of different fungi varied among olive cultivars. Generally, Fusarium spp. were the most frequently isolated pathogens and Fusarium oxysporum was the most frequent (35.5%) on all cultivars followed by F. solani (19.3%) R. solani (16.1%). Meanwhile, S. rolfsii, F. moniliforme, Cylindrocarpon sp. and A. alternata occurred at lowfrequencies. Pathogenicity tests showed that all tested isolates caused varied degrees of root rot symptoms on olive transplants, cvs. Manzanillo and Picual. Fusarium oxysporum, F. solani and R. solani caused the highest root rot incidence and severity on both cultivars. There was a positive correlation between disease severity on roots and severity of foliar symptoms. All evaluated olive cultivars were susceptible or extremely susceptible to fungal pathogens. All cultivars showed high disease severity with root rots, especially in response to infection by F. solani, F. oxysporum and S. rolfsii. However, the least foliar symptoms were recorded on cultivar Coratina. Application of two commercial biological control products (Rhizo-Plus and Trichoderma 2000) to soil, 24h before planting olive cuttings in the nursery, significantly reduced incidence of root rot on transplants of cultivars Manzanillo and Picual, up to 28 weeks after plantinghttps://ajs.journals.ekb.eg/article_15576_eb9a08cbd703191b7fb68bb5012b1f48.pdfoliveroot rotfungal pathogensbiological controlrhizo-plustrichoderma 2000 |
| spellingShingle | M.S. Mousa, M.K. Ali A.A. Mosa I.S Elewa ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROL Arab Universities Journal of Agricultural Sciences olive root rot fungal pathogens biological control rhizo-plus trichoderma 2000 |
| title | ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROL |
| title_full | ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROL |
| title_fullStr | ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROL |
| title_full_unstemmed | ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROL |
| title_short | ROOT ROT DISEASE OF OLIVE TRANSPLANTS AND ITS BIOLOGICAL CONTROL |
| title_sort | root rot disease of olive transplants and its biological control |
| topic | olive root rot fungal pathogens biological control rhizo-plus trichoderma 2000 |
| url | https://ajs.journals.ekb.eg/article_15576_eb9a08cbd703191b7fb68bb5012b1f48.pdf |
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