The occurrence and distribution of isolates of raspberry bushy dwarf virus in England
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SUMMARY The distribution of distinct isolates of raspberry bushy dwarf virus (RBDV) in Rubus in England was studied. Isolates similar in Rubus host range to the Scottish type isolate (D200) were largely confined to the old red raspberry ( Rubus idaeus ) cv. Norfolk Giant, but were also encountered in a single plant of an unidentified raspberry cultivar and in a clump of wild R. idaeus. Outside East Mailing Research Station (EMRS) RBDV isolates with wider Rubus host ranges than that of the type isolate were found only and exclusively in hybrid berries (Loganberry, clones LY59 and L654, and Tayberry) in which infection ranged from < 1% to 100%. The significance of these findings is discussed.Keywords:
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ISHS Symposium on Breeding and Machine Harvesting of Rubus and Ribes CHANGES IN THE FRUIT RETENTION STRENGTH OF THE RED RASPBERRY (RUBUS IDAEUS L.) DURING RIPENING AND THEIR RELEVANCE TO THE SELECTION OF RASPBERRY CLONES SUITABLE FOR MECHANICAL HARVESTING
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SUMMARYIn May 1991 the stems of expanding fruiting laterals of red raspberry (Rubus idaeus) in plantations inTayside, easternScotland were extensively chewed by adults of Cantharis obscura L. (Coleoptera: Cantharidae). This appears to be the firstrecord of damage to plants by this group of insects in the UK. In choice tests, the adultbeetles damaged excised fruitinglaterals of both cultivated black raspberry (R. occidentalis) cv. Cumberland, and red raspberry cv. Glen Prosen, but did little damage to other closely related Rubus species and hybrids, including wild bramble (R. fruticosus agg.) and wild red raspberry (R. idaeus var. vulgatus).
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A new hybrid raspberry between Rubus cockburnianus Hemsl. and R. idaeus L. spontaneously occurring in Brighton, East Sussex is described and provided with the name R. × knappianus A. Spiers & J.D. Arm. Its origin, ecology, and distinguishing characteristics are discussed and its previous artificial production through breeding for the fruit trade is noted. Some comments regarding breeding systems in the parent species are made.
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SUMMARY The distribution of distinct isolates of raspberry bushy dwarf virus (RBDV) in Rubus in England was studied. Isolates similar in Rubus host range to the Scottish type isolate (D200) were largely confined to the old red raspberry ( Rubus idaeus ) cv. Norfolk Giant, but were also encountered in a single plant of an unidentified raspberry cultivar and in a clump of wild R. idaeus. Outside East Mailing Research Station (EMRS) RBDV isolates with wider Rubus host ranges than that of the type isolate were found only and exclusively in hybrid berries (Loganberry, clones LY59 and L654, and Tayberry) in which infection ranged from < 1% to 100%. The significance of these findings is discussed.
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