ISHS Acta Horticulturae 777: IX International Rubus and Ribes Symposium
A SURVEY OF THE RESEARCH WORK ON CRUMBLY FRUIT IN RED RASPBERRY IN EUROPE |
| Author: | G. Muster |
| Keywords: | raspberry, crumbly fruit, climatic conditions, propagation methods (in vitro propagation) |
| Abstract:
Since the end of the 1980s crumbly fruit has been observed in Germany. A crumbly fruit may be characterized by a smaller number of mostly swollen drupelets. Then the construction is so fragile that the drupelets crumble while picking. These fruits are not suitable for freshmarket and freezing. At the research station in Weinsberg several trials were carried out. The subjects were concluded from various hypotheses: 1. virus infection 2. propagation methods 3. climatic effects. Although raspberry bushy dwarf virus (RBDV) is well known to cause crumbliness, in this case it could neither be identified nor transmitted by grafting. There are crumbly fruit found in plants which were propagated conventionally and in plants propagated in vitro. Crumbly fruit may occur everywhere in the plantation and on canes bearing solely crumbly fruit. The character “crumbliness” of “crumbly canes” can be propagated conventionally and by in vitro methods. Because of the yearly differences in the amount of crumbly fruit, climatic effects are assumed. Such effects (as increased/decreased temperature) could not be proved. Selection of fruiting motherplants is still the most effective way to reduce crumbliness in plantations. | |
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