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Cercosporella rubi is a plant pathogenic fungus which causes blackberry rosette, [1] a disease that is also known as double blossom [2] or witches' broom [3] of blackberry. In infected plants, the symptoms that C. rubi causes are double blossoms as well as witches' brooms .
Phragmidium violaceum is a plant pathogen native to Europe, Africa, and the Middle East.It primarily infects Rubus species.. It has been used in the biological control of invasive blackberry species in Chile, Australia, and New Zealand.
Fruit growers are selective when planting blackberry bushes because wild blackberries may be infected, [36] and gardeners are recommended to purchase only certified disease-free plants. [37] The spotted-wing drosophila, Drosophila suzukii, is a serious pest of blackberries. [38]
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Rubus ursinus is a wide, mounding shrub or vine, growing to 0.61–1.52 metres (2–5 feet) high, and more than 1.8 m (6 ft) wide. [3] The prickly branches can take root if they touch soil, thus enabling the plant to spread vegetatively and form larger clonal colonies.
Rubus armeniacus, the Himalayan blackberry [2] or Armenian blackberry, is a species of Rubus in the blackberry group Rubus subgenus Rubus series Discolores (P.J. Müll.) Focke. It is native to Armenia and northern Iran , and widely invasive elsewhere.
The fruits are compound drupes which change from bright red to black at maturity. Each section (drupelet) of a blackberry contains a single seed. Second year plants die after bearing fruits, but regrow from the underground portion of the plant. There are many species of blackberries, which are edible and differ by size. [6]
Rubus ulmifolius is a species of wild blackberry known by the English common name elmleaf blackberry or thornless blackberry and the Spanish common name zarzamora.It is native to Europe and North Africa, and has also become naturalized in parts of the United States (especially California), Australia, and southern South America.