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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 .
Vegetation includes upland tree species such as coast live oak and California bay laurel; understory growth such as coyote brush, toyon and poison oak; and riparian vegetation such as red willow and wild blackberry. In the extreme downstream reaches rufous-crowned sparrow, California thrasher and American kestrel can be observed on chaparral slopes
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.
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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 ]
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.
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Rubus pensilvanicus, known commonly as Pennsylvania blackberry, is a prickly bramble native to eastern and central North America from Newfoundland south to Georgia, west as far as Ontario, Minnesota, Nebraska, Missouri, and Arkansas. The species is also established as a naturalized plant in California. [2] [3]