Mary Carmen (APF-122) blackberry variety

Rating [ 5 ]

Ultra early-ripening moderately thorny primocane-only fruiting blackberry cultivar

Originated from a cross of

Originated from a cross of Prime-Ark 45 (APF-45) x A-2286

Plants are

Plants are slightly thorny

Bushes have

Bushes have erect canes

Fruit weight is

Fruit weight is 6 g


Berries have a oblong shape

Fruiting habit

Fruiting habit - primocane-fruiting only

Flowering on floricanes starts in the

Flowering on floricanes starts in the third week of June

Ripening date (regular) -

Ripening date (regular) - first week of August

Productivity is

Productivity is 14000 kg from ha

Soluble solids

Soluble solids - 11.1%

Cold hardiness is

Cold hardiness is low

Country of origin

Country of origin - United States


Patent US PP27,401 P3 dated November 21, 2016

Current status

Current status - cultivated (actual)

John R. Clark, the prominent breeder from the University of Arkansas selected the Mary Carmen (APF-122) blackberry as a primocane-fruiting cultivar. The female parent of Mary Carmen is Prime-Ark 45.
Canes that emerge in the spring during the first period of vegetative growth produce flower and fruit without passing through a period of dormancy. The Mary Carmen is a highly precocious cultivar. It initiates fruit production three to four weeks earlier than other primocane blackberry varieties. Bearing type - primocane only.
The canes of the  blackberry variety APF-122 are erect and moderately thorny. The variety has less vegetative vigor than other Arkansas cultivars. Its moderate vigor reduces or even eliminates the need for extensive tipping. Canes grow to an average of 1,2 m in length over the course of a single growing season. Primocanes emerge both from the crown of the plant as well as from the suckers.
The time of flowering (50% of plants at first flower) is the middle of June on primocanes. Flowers are white, about 4 cm in diameter.
The blackberry variety Mary Carmen yields medium size fruit, averaging 6 to 9 g. The fruit is round in shape and very firm. The large berries sometimes develop a slightly elongated shape, but the most part are medium size and consistently round. APF-122 produces a heavy primocane crop, reducing the economic viability of floricane production. Yields average 14000 to 16000 kg/ha. When temperatures exceed 30–32 C at the time of flower set, problems with pollination may occur. Time of ripening is the beginning of August on primocanes.
Berries show very little post-harvest color reversion (< 10 %) of the drupelets related to cooling and cold storage. There is little evidence of post-harvest decay or rot when held up to 7 days at 5 °C.
The Mary Carmen blackberry variety provides a late season alternative to contemporary floricane production in cold, continental climates. Growers adjust the harvest window through timely pruning over the course of the season. An effective cane management plan must be developed according to the climatic conditions under which it is being grown. Mary Carmen will be well as addition to autumn raspberry harvest.
The Mary Carmen variety has shown tolerance to powdery mildew (Podosphaera aphanis), anthracnose (Elisinoe veneta), crown gall (Agrobacterium tumefaciens) and botrytis (Botrytis cinerea).

Useful Growing Guides

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