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All brambles, especially black raspberries, are susceptible to cane blight. [3] The causal agent for Cane Blight is the fungus Leptosphaeria coniothyrium. [4]The infection spreads internally first, therefore outwardly noticeable symptoms typically do not appear quickly.
Raspberry spur blight is caused by the fungus Didymella applanata. [2] This plant pathogen is more problematic on red raspberries (Rubus idaeus) than on black or purple raspberries. The fungus infects the leaves first and then spreads to the cane. It causes necrotic spots on the cane near the base of the petiole attachment. [3]
A raspberry leaf spot infection initially causes dark green circular spots on the upper side of young leaves, which will eventually turn tan or gray. [3] These spots are typically 1–2 millimetres (0.039–0.079 in) in diameter, but can get as big as 4–6 millimetres (0.16–0.24 in). [4]
Canes have curved, sharp thorns, while immature canes are unbranched and have a whitish bloom. [9] The black raspberry is related to the red raspberry Rubus idaeus and Rubus strigosus, sharing the white underside of leaves, [10] and fruit that readily detaches from the carpel. [9]
Rubus phoenicolasius (Japanese wineberry, [2] wine raspberry, [3] wineberry or dewberry) is an Asian species of raspberry (Rubus subgenus Idaeobatus) in the rose family, native to China, Japan, and Korea. The species was introduced to Europe and North America as an ornamental plant and for its potential in breeding hybrid raspberries.
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Rubus leucodermis is a deciduous shrub growing to 0.5–2.5 metres (1 + 1 ⁄ 2 –8 feet), with prickly shoots. [5] While the crown is perennial, the canes are biennial, growing vegetatively one year, flowering and fruiting the second, and then dying.
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