Phytoparasitica (1997) 25, 87-88

K. Graichen, F. Rabenstein and E. Schliephake (1997)
Epidemic infestation of winter oilseed rape crops by turnip yellows luteovirus (TuYV) in Germany
Phytoparasitica 25 (1), 87-88
The Xth International Congress of Virology, August 11-16, 1996, Jerusalem, Israel, poster
Abstract: During the period from 1991 to 1995, pronounced differences were detected in the infestation of winter oilseed rape crops (Brassica napus L.) by TuYV (syn. beet western yellows luteovirus) in different regions of Germany. Whereas in 1993/94 the degree of TuYV infections in most of the crops ranged from 0 to 6%, in 1992 and 1995 the levels were 42% to 100% in many crops. In the 1994/95 growing season, 21 out of 64 oilseed rape crops tested suffered 52% to 100% infection by TuYV. The cause of the high degree of TuYV infections in oilseed rape crops is probably its wide host range, including a number of cultivated plants and common arable weed species. Furthermore, in our studies 17 out of 23 aphid species were able to transmit TuYV on oilseed rape plants. The differences in the infection degree in various years can be traced to an interruption of the infection cycle caused by the hot and dry summers in 1992 and 1993, respectively. In 3-year experiments, yield losses from 12% to 34% were caused by TuYV infections on two cultivars tested. Together with the high degree of infection of oilseed rape, this leads us to the conclusion that it is necessary to prevent yield losses by the breeding of new cultivars resistant to TuYV.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Edgar Schliephake

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Turnip yellows virus	Rape/canola (Brassica napus)	Germany