Bulletin of Insectology (2007) 60, 395-396

A. Bressan, O. Sémétey, B. Nusillard and E. Boudon-Padieu (2007)
The syndrome "basses richesses" of sugar beet in France is associated with different pathogen types and insect vectors
Bulletin of Insectology 60 (2), 395-396
First International Phytoplasmologist Working Group Meeting (IPWG), Bologna (Italy) November 12-15, 2007
Abstract: The syndrome 'basses richesses' (SBR) of sugar beet in France is associated with two phloem-restricted uncultivable bacteria: a stolbur phytoplasma and a gamma-3 proteobacteria. The known vector of proteobacteria is a cixiid planthopper, Pentastiridius leporinus (Hemiptera Cixiidae), formerly shown to transmit both the prokaryotes. The role of P. leporinus and of two other planthopper species, Cixius wagneri and Hyalesthes obsoletus, in spreading the two pathogens to sugar beet were compared and quantified. Because of its abundance and high infection rates with proteobacterium, P. leporinus was confirmed to be the economic vector of SBR disease. P. leporinus and C. wagneri were infected by and transmitted proteobacterium, neither was infected by the phytoplasma. Neither of two populations of H. obsoletus living near sugar beet fields on bindweed and nettle respectively, carried proteobacteriumbut they were highly infected with two RFLP-differentiable stolbur types. Only the bindweed stolbur type was transmitted and pathogenic to sugar beets. Symptoms associated with the two prokaryotes were similar, but stolbur caused a stronger reduction on taproot biomass and sugar content than proteobacteria. This work underlines possible confusion in aetiology of diseases associated with phytoplasmas or phloem-restricted proteobacteria and the increasing importance of the latter plant pathogens.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Elisabeth Boudon-Padieu

Research topic(s) for pests/diseases/weeds:
transmission/dispersal of plant diseases

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Hyalesthes obsoletus		France
	Cixius wagneri		France
	Pentastiridius leporinus	Beet/sugarbeet (Beta vulgaris)	France
	Arsenophonus phytopathogenicus	Sugarcane (Saccharum officinarum)	France