Virus, POTYVIRIDAE, POTYVIRUS .
Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images
The typical symptom in the pea is the downward rolling of the leaflet.
According to the temperature conditions and the virus strain, symptoms slightly vary in mosaic and/or the degree of leaf rolling up to the total necrosis of the plant.
In optimum temperature conditions the first symptoms consist in slight chlorosis and distorsion.
Then the leaflets narrow and their margins roll downward, the internodes get shorter and stunting may occur.
Abortion occurs in flowers, the pods become distorted, they produce reduced seeds and sometimes present necrotic lines.
Four to five weeks retarded growth and maturation.
Contamination of the field caused by contaminated seeds.
The spreading of the disease in the field from infected seedlings is carried through very efficiently in a non persisting way by 22 species of which the 3 main ones are : Myzus persicae , Macrosiphum spp. and Acyrthosiphum pisum Harr.
Temperature limits the expression of symptoms in the field.
The mosaic becomes clear only between 20 °C. and 30 °C.
The spreading of the virus from the primary fociby early aphid invasion increases the number of secondary infective foci which are the source of secondary epidemics.
Use certified seeds.
HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.