|Author: ||A. Zhivondov|
|Keywords: ||Prunus domestica, breeding, plum, new cultivar|
The major aim of the breeding programme of the Fruit Growing Institute in Bulgaria is the development of new plum cultivars highly tolerant or resistant to Sharka disease (Plum pox virus) and possessing good economic characteristics.
The ‘Plovdivska renkloda’ cultivar was established by selecting seedlings obtained from open pollination of ‘Stanley’. ‘Stanley’ itself was grown in a collection plantation, which included 170 plum cultivars in total.
In 1988 and 1989 at the beginning of the experimental work, large amounts of fruits obtained by open pollination in the collection orchard of the Institute were harvested from ‘Stanley’. After the mass selection of thousands of seedlings, their number was reduced to several hundred.
After breeding evaluation had been carried out twice, ten elites were selected and propagated.
At present they are being grown in the collection plantation grafted on the Zhalta dzhanka (Myrobalan) seedling rootstock at a distance of 6 х 4 m.
After studying their pomological and economic qualities, elite No. 6-5 (‘Plovdivska renkloda’) proved to be the best among the ten elites, given the highest complex evaluation.
The cultivar name shows that it belongs to the group of the Reine Claudes.
Contrary to the known ‘Green gage’ and ‘Althan’s gage’, the new cultivar ‘Plovdivska renkloda’ is self-fertile.
Its fruits ripen a little later than those of ‘Green gage’ and ‘Althan’s gage’, their size being 42.89 х 43.03 х 39.98 mm and their average weight – 44.98 g.
The shape is spherical and the skin is violet-red.
Fruit flesh is golden-yellow, moderately juicy, homogeneous, sweet, with slight acidity and a pleasant aroma.
The stone is small, representing 4.01% of the total fruit weight.
The tree is moderate in growth and highly productive.
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