Aerial Concentrations of Pathogens Causing Early Blight and Brown Spot Within Susceptible Potato Fields
| Autor: | Shunping Ding, Kiana Meinholz, Douglas I. Rouse, Amanda J. Gevens |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Canopy fungi Alternaria solani Alternaria food and beverages Plant Science Biology biology.organism_classification 01 natural sciences Fungicides Industrial Conidium Crop Fungicide 03 medical and health sciences Horticulture 030104 developmental biology Blight Biological dispersal Agronomy and Crop Science Solanaceae Plant Diseases Solanum tuberosum 010606 plant biology & botany |
| Zdroj: | Phytopathology®. 109:1425-1432 |
| ISSN: | 1943-7684 0031-949X |
| Popis: | Early blight caused by Alternaria solani and brown spot caused by A. alternata are two common foliar diseases of potato, with early blight typically predominating in incidence and severity. Renewed interest in these two diseases has arisen as a result of notable differences in fungicide resistance profiles of the pathogens and inconsistent outcomes of disease management tactics. The pathogens share similar disease cycles, but they differ in the shape and size of their conidia. A. solani has a host range that includes just the Solanaceae, whereas A. alternata has a broad host range spanning numerous plant families. Such differences may result in differences in dispersal of the pathogens and subsequently influence epidemiology and management outcomes. In the commercial potato fields investigated in this study, the aerial conidial concentrations of A. solani and A. alternata differed significantly, with those of A. alternata conidia being higher in number and more variable than those of A. solani. The aerial conidial concentration of A. solani almost always significantly decreased with height (0 to 3 m above the canopy), whereas such a decrease was only observed for 4 of 12 days for A. alternata. The atmospheric concentrations of A. alternata were higher than those of A. solani at both upwind and downwind edges of the field (P < 0.0001), indicating more potential for long-distance dispersal. A higher aerial concentration of conidia at the downwind than the upwind location was observed for A. solani (P < 0.05), whereas overall no such effect was observed for A. alternata. This indicated that the potato fields investigated were likely the source of A. solani conidia, but they may not be the sole source of A. alternata. Results are consistent with inoculum of A. solani coming primarily from within the potato crop, whereas that of A. alternata may be generated from diverse plant sources across the landscape. |
| Databáze: | OpenAIRE |
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