ISHS Acta Horticulturae 656: X International Symposium on Small Fruit Virus Diseases
"CANDIDATUS PHLOMOBACTER FRAGARIAE" IS THE PREVALENT AGENT OF MARGINAL CHLOROSIS OF STRAWBERRY IN FRENCH PRODUCTION FIELDS AND IS TRANSMITTED BY THE PLANTHOPPER CIXIUS WAGNERI (CHINA) |
| Authors: | X. Foissac, J.L. Danet, L. Zreik, P. Salar, E. Verdin, J.G. Nourrisseau, M. Garnier |
| Keywords: | Fragaria x ananassa, phytoplasma, stolbur, nurseries, Fulguromorpha, Cixiidae, insect vector |
| Abstract:
A large scale survey for marginal chlorosis in French strawberry production fields and nurseries by PCR amplification of “Candidatus Phlomobacter fragariae” and stolbur phytoplasma 16S rDNA was undertaken in 1996. Compilation of survey results from 1996 to 2001, clearly shows that “Ca P. fragariae” is predominant in strawberry production fields, while the stolbur phytoplasma predominantly is detected in nurseries. In strawberry fruit production fields there were two transmission periods, one in spring, the other from late summer to early fall. When looking for putative insect vectors in spring and fall 2001 and 2002 in strawberry production fields affected by marginal chlorosis, the planthopper Cixius wagneri was captured. This insect was encountered very rarely in previous insect surveys conducted in spring and summer. High proportions of these planthoppers were shown to be infected by “Ca P. fragariae” using the spoT PCR-RFLP detection method and sequencing. When caged on healthy, in vitro grown strawberry plants, naturally infected C. wagneri adults efficiently transmitted “Ca P. fragariae” to strawberry plants that eventually developed marginal chlorosis. | |
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