Beet yellow stunt virus (BYSV)
 

Virus yellow stunting Beet ( Beet yellow stunt virus , BYSV) belongs to the family of Closteroviridae and gender Closterovirus (Figure 1). It is transmitted efficiently by Hyperomyzus lactucae , in the semi-persistent mode. Myzus persicae , Macrosiphum euphorbiae can be more punctually vectors .


- Symptoms

Gradual yellowing of old leaves and sudden collapse of plants which eventually die. A longitudinal cut through the pivot and the stem reveals the presence of internal necrotic lesions.


- Main characteristics

BYSV is most prevalent in the United States, in California, where it was described in 1963. In this country, it is isolated on Sonchus and sporadically on lettuce. It has also been reported in Great Britain. It has a fairly wide host range including species belonging to 5 botanical families (Asteraceae, Chenopodiaceae, Geraniaceae, Portulacaceae and Solanaceae) and wild lettuce. Its cultivated hosts are beets and lettuce. The virus is transmissible for 1, 2, sometimes 4 days. It does not appear to be seed transmitted .