Abstract. Yield, fruit size and field resistance of plants to fungal diseases of 19 blackcurrant cultivars and breeding clones are presented in this paper. Studies were carried out in the field of the Experimental Orchard of the Research Institute of Pomology and Floriculture at Dabrowice, near Skierniewice, Central Poland in 2002-2006. The results showed that the tested genotypes differed in evaluated traits. New Polish cultivars (‘Tisel’ and ‘Tiben’) and clones (PC- 140, PC-175, PC-146 and PC-425) as well as Ukrainian (‘Jubilejnaja Kopania’, ‘Sofijewskaja’ and ‘Wernisaż’) produced considerably higher yields than standard cultivars (‘Ojebyn’, ‘Ben Lomond’ and ‘Titania’). The largest fruits had ‘Ben Connan’, ‘Wernisaż’, ‘Jubilejnaja Kopania’ and ‘Sofijewskaja’ (Ukraine) and breeding clones PC-425 and PC-140. The most resistant to powdery mildew, leaf spot and white pine blister rust were cultivars ‘Titania’ and ‘Tisel’ and clones marked PC-52, PC-96, PC-132, PC-141 and PC-425.

Productive value of new blackcurrant cultivars and clones evaluated in 2000-2006

Summary

The aim of the studies was an evaluation of productive value (yield, fruit size and field resistance of plants to leaf diseases) of 19 blackcurrant cultivars and breeding clones. The field experiment was established in autumn of 2000 in the Experimental Orchard of the Research Institute of Pomology and Floriculture at Dąbrowice, near Skierniewice, Central Poland. The experiment was set up in the randomized complete block design with 3 replications, including 3 plants per plot of each genotype. The following traits: ripening time, yield, fruit weight and the susceptibility of plants to powdery mildew, leaf spot and white pine blister rust were evaluated in 2002-2006.

The results showed that the tested cultivars and breeding clones differed in all of the evaluated traits. New Polish cultivars (‘Tisel’ and ‘Tiben’) and clones (PC- 140, PC-175, PC-146 and PC-425) as well as Ukrainian (‘Jubilejnaja Kopania’, ‘Sofijewskaja and ‘Wernisaż’) produced considerably higher yields than standard cultivars (‘Ojebyn’, ‘Ben Lomond’ and ‘Titania’). The largest fruits had ‘Ben Connan’, ‘Wernisaż’ ‘Jubilejnaja Kopania’ and ‘Sofijewskaja and breeding clones marked PC-425 and PC-140. Most of the tested genotypes were resistant to powdery mildew, only ‘Ben Lomond, ‘Alta’ and ‘Sofijewskaja’ showed typical symptoms of this disease. All the studied cultivars and clones were infected by leaf spot at a different level. The least susceptible were ‘Ben Connan’, ‘Jubilejnaja Kopania’, ‘Wernisaż’ and ‘Titania’ as well as clones marked PC-146, PC-141, PC-132 and PC-425. No symptoms of white pine blister rust was noticed on plants of ‘Titania’ and ‘Tisel’ and clones PC-52, PC-96, PC-132, PC-141 and PC-425.