& Ev.) Anderson (leaf blight), Sphaerotheca macularis (Wallr.) U. & Ev.) Wolf causing leaf scorch, Mycosphaerella fragariae (Tul.) Lindau (anamorph Ramularia tulasnei Sacc., leaf spot), Dendrophoma obscurans (Ell. In North America, strawberry plants are prone to infection by a number of pathogens including Diplocarpon earliana (Ell. Due to differences in climate and soil conditions between the different continents, there are different problems in cultivation of strawberries in each of these areas, including infection of plants with fungal and/or bacterial diseases that are of major economic importance. However, the vast majority of strawberry fruit production takes place in the northern hemisphere, on continents such as North America (as much as 78 %-1.4 million tonnes, mainly in the USA), Europe (1.3 million tonnes, mainly in Spain, Russia, Germany, and Poland) and Asia (800 thousand tonnes, mainly in Japan and Korea) (FAOSTAT 2014 data for the year 2012). The strawberry is an important small fruit crop widely grown around the world. High usefulness for breeding new, resistant varieties has also been observed in the combination ‘Aromas’ × ‘Elianny’, which has significantly negative SCA effects for the susceptibility of plants to both strawberry leaf spot and leaf scorch. The lowest GCA effects for low plant susceptibility to the all three leaf diseases tested were observed with cv.‘Albion’. Lower breeding values for the estimated traits were observed with cv.‘Camarosa’-for low susceptibility to leaf spot with cvs ‘Palomar’ and ‘Granda’-for low plant susceptibility to leaf scorch, and with cvs ‘Monterey’, ‘Portola’ and ‘Charlotte’-for low plant susceptibility to powdery mildew. High GCA effects were also showed for cvs ‘Figaro’ and ‘San Andreas’-for low plant susceptibility to leaf spot and leaf scorch, and for cv.‘Diamante’-for low plant susceptibility to leaf spot and powdery mildew. The most numerous significant and positive GCA effects were estimated for cv.‘Salsa’ for low plant susceptibility (tolerance) to all three diseases assessed.
Statistical analysis of data was performed according to Griffing’s fixed model.
Observations of the severity of plant infection with leaf spot, leaf scorch and powdery mildew were recorded from 2011 to 2013. Progenies of the 78 newly obtained families were evaluated in field conditions (randomized complete block design, 4 replicates, 15 plants per plot). The crossing programme was performed in the winter of 2010/2011 in the glasshouse following a half-diallel cross mating design (Griffing’s method IV). & Ev.) Wolf) and powdery mildew ( Sphaerotheca macularis (Wallr.) U. The aim of the study was to estimate the general and specific combining abilities (GCA and SCA) of 13 dessert strawberry cultivars: ‘Figaro’, ‘Salsa’, ‘Palomar’, ‘Granda’, ‘Camarosa’, ‘Elianny’, ‘Aromas’, ‘Diamante’, ‘Portola’, ‘Charlotte’, ‘San Andreas’, ‘Monterey’ and ‘Albion’ for tolerance to the major leaf diseases strawberry leaf spot ( Mycosphaerella fragariae (Tul.) Lindau), leaf scorch ( Diplocarpon earliana (Ell.
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