Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae
Symptoms of circular leaf spot of persimmon (CLSP), caused by Mycosphaerella nawae, consisted of necrotic spots on leaves, chlorosis and premature defoliation. Although CLSP is a foliar disease, early fruit maturation and abscission are frequently associated with the presence of lesions on leaves an...
| Autores principales: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
2018
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| Acceso en línea: | http://hdl.handle.net/20.500.11939/6020 |
| _version_ | 1855492003217801216 |
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| author | Bassimba, Daniel Mira, José L. Sedano, Maria E. Vicent, Antonio |
| author_browse | Bassimba, Daniel Mira, José L. Sedano, Maria E. Vicent, Antonio |
| author_facet | Bassimba, Daniel Mira, José L. Sedano, Maria E. Vicent, Antonio |
| author_sort | Bassimba, Daniel |
| collection | ReDivia |
| description | Symptoms of circular leaf spot of persimmon (CLSP), caused by Mycosphaerella nawae, consisted of necrotic spots on leaves, chlorosis and premature defoliation. Although CLSP is a foliar disease, early fruit maturation and abscission are frequently associated with the presence of lesions on leaves and defoliation, resulting in severe economic losses. Despite their importance for the design of efficient disease management programmes, quantitative relationships between CLSP incidence and yield loss are unknown. Therefore, fungicide efficacy trials were conducted during two consecutive years in Spain to induce different levels of disease severity, defoliation and yield loss. The effects of fungicide treatments on CLSP severity were analysed by ordinal logistic regression models. Relative yield loss values were regressed against the percentage of affected leaves or defoliated obtained at different evaluation dates. The disease had high negative impact and complete yield loss was observed in the absence of effective fungicide treatments. Preventive applications of pyraclostrobin, trifloxy-strobin and mancozeb provided the best disease control and highest yields, up to 95.77kgtree(-1). An exponential relationship of CLSP incidence and defoliation with yield loss was found. In general, model fit and predictive ability was superior when defoliation, rather than incidence, was used as explanatory variable. The impact of defoliation on yield loss was higher in earliest evaluation dates, suggesting that early leaf abscission may be the main factor contributing to premature fruit drop and subsequent yield loss. Substantial yield losses were observed even with relatively low levels of CLSP incidence and defoliation. Therefore, it was not possible to define a critical action threshold for CLSP management based on foliar symptoms. |
| format | Artículo |
| id | ReDivia6020 |
| institution | Instituto Valenciano de Investigaciones Agrarias (IVIA) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| spelling | ReDivia60202025-04-25T14:45:55Z Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae Bassimba, Daniel Mira, José L. Sedano, Maria E. Vicent, Antonio Symptoms of circular leaf spot of persimmon (CLSP), caused by Mycosphaerella nawae, consisted of necrotic spots on leaves, chlorosis and premature defoliation. Although CLSP is a foliar disease, early fruit maturation and abscission are frequently associated with the presence of lesions on leaves and defoliation, resulting in severe economic losses. Despite their importance for the design of efficient disease management programmes, quantitative relationships between CLSP incidence and yield loss are unknown. Therefore, fungicide efficacy trials were conducted during two consecutive years in Spain to induce different levels of disease severity, defoliation and yield loss. The effects of fungicide treatments on CLSP severity were analysed by ordinal logistic regression models. Relative yield loss values were regressed against the percentage of affected leaves or defoliated obtained at different evaluation dates. The disease had high negative impact and complete yield loss was observed in the absence of effective fungicide treatments. Preventive applications of pyraclostrobin, trifloxy-strobin and mancozeb provided the best disease control and highest yields, up to 95.77kgtree(-1). An exponential relationship of CLSP incidence and defoliation with yield loss was found. In general, model fit and predictive ability was superior when defoliation, rather than incidence, was used as explanatory variable. The impact of defoliation on yield loss was higher in earliest evaluation dates, suggesting that early leaf abscission may be the main factor contributing to premature fruit drop and subsequent yield loss. Substantial yield losses were observed even with relatively low levels of CLSP incidence and defoliation. Therefore, it was not possible to define a critical action threshold for CLSP management based on foliar symptoms. 2018-05-09T16:30:55Z 2018-05-09T16:30:55Z 2017 article acceptedVersion Bassimba, D.D.M., Mira, J. L., Sedano, M. E., Vicent, A. (2017). Control and yield loss modelling of circular leaf spot of persimmon caused by mycosphaerella nawae. Annals of Applied Biology, 170(3), 391-404. 0003-4746 http://hdl.handle.net/20.500.11939/6020 10.1111/aab.12343 en Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ electronico |
| spellingShingle | Bassimba, Daniel Mira, José L. Sedano, Maria E. Vicent, Antonio Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae |
| title | Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae |
| title_full | Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae |
| title_fullStr | Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae |
| title_full_unstemmed | Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae |
| title_short | Control and yield loss modelling of circular leaf spot of persimmon caused by Mycosphaerella nawae |
| title_sort | control and yield loss modelling of circular leaf spot of persimmon caused by mycosphaerella nawae |
| url | http://hdl.handle.net/20.500.11939/6020 |
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