Susceptibility of Strawberry Cultivars and Advanced Selections to Leaf Spot Caused by Mycosphaerella fragariae

in HortScience
Authors:
Nathalie DelhomezEcole Nationale d'Ingénieurs des Travaux Agricoles de Dijon, 21 Olivier de Serre Boulevard, B.P. 48-21802 Quetigny Cedex, France

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Odile CarisseAgriculture and Agri-Food Canada Research Station, 430 Gouin Boulevard, St-Jean-sur-Richelieu, Que. J3B 3E6, Canada

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Michel LareauAgriculture and Agri-Food Canada Research Station, 430 Gouin Boulevard, St-Jean-sur-Richelieu, Que. J3B 3E6, Canada

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Shahrokh KhanizadehDepartment of Plant Science, McGill University, Ste-Anne-de-Bellevue, Que. H9X 3V9, Canada, and Agriculture and Agri-Food Canada Research Station, 430 Gouin Boulevard, St-Jean-sur-Richelieu, Que. J3B 3E6, Canada

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Seventeen strawberry (Fragaria ×ananassa Duchesne) cultivars and six selections were tested under greenhouse conditions for susceptibility to leaf spot induced by Mycosphaerella fragariae (Tul.) Lindau. The level of susceptibility was evaluated based on maximum disease severity and area under the disease progress curve (AUDPC). The 23 genotypes were ranked based on AUDPC and grouped according to their susceptibility. Cluster analysis for AUDPC gave four groups corresponding to low, moderate, high, and very high susceptibility to leaf spot. `Annapolis', `Chambly', `Glooscap', `Redcoat', and `Veestar' consistently showed a low level of susceptibility. The selections SJ89700-1 and SJ8518-11 and `Tribute' showed a very high level of susceptibility, and the remaining cultivars were grouped as either moderately or highly susceptible.

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