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Virus, LUTEOVIRUS .

Crops attacked: sugar beet .

Mild virus yellows

Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images

[R]Description
Yellow-orange discoloration usually starting from the extremity of the leaves.
Secondary infection by saprophytic fungi ( Alternaria , Phoma ) may occur, cause brown marginal leaf necrosis and even destroy part of the foliage.
The amount and quality of the sugar content are reduced.
The quality and the yield of the seed crops can be seriously affected.

[R]Biology
The virus is transmittedby : Myzus persicae and Aphis fabae .
The virus infects all the plant tissues and even the vessels.
The inoculum sources are : unharvested or ensiled beet and beet seed crops, spinach or various weeds : Anagallis arvensis , Capsella Boursa-pastoris , Chenopodium sp. , Papaver Rhaeas , Veronica sp. , Polygonum persicaria .

[R]Epidemiology
The risk of early attacks extended to the whole field is increased by dry warm spring conditions, presence of aphid vectors and the vicinity of inoculum carriers.
The first foci correspond to the first plants touched by an infected aphid and their reproductive line.

[R]Treatement
Avoid the presence of host plants.
Keep down the aphid populations by chemical treatment.

[R]Possible misleading
Severe yellows virus (BYV) which may occur in the same field.

[R] Images

1. Beet mild yellowing virus, BMYV (INRA)
   Beet mild yellowing virus Focus of beet mild yellowing virus in field conditions.
   
2. Beet mild yellowing virus, BMYV (PUTZ C., INRA)
   Beet mild yellowing virus A leaf infected by beet mild yellowing virus showing an orange colouration of the tip.
   

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